Delivery cost of human papillomavirus vaccination of young adolescent girls in Peru, Uganda and Viet Nam
Carol E Levin a, Hoang Van Minh b, John Odaga c, Swampa Sarit Rout d, Diep Nguyen Thi Ngoc e, Lysander Menezes f, Maria Ana Mendoza Araujo g & D Scott LaMontagne h
a. Department of Global Health, University of Washington, 325 Ninth Avenue, Box 359931, Seattle, Washington, 98104, United States of America (USA).
b. Department of Health Economics, Hanoi Medical University, Hanoi, Viet Nam.
c. Child Health and Development Centre, Makerere University, Kampala, Uganda.
d. Centre for Operations Research and Training, Vadodara, India.
e. PATH, Hanoi, Viet Nam.
f. PATH, New Delhi, India.
g. Estrategia Sanitaria Nacional de Inmunización (National Expanded Programme for Immunization), Ministry of Health, Lima, Peru.
h. PATH, Seattle, USA.
Correspondence to Carol E Levin (email: firstname.lastname@example.org).
(Submitted: 04 October 2012 – Revised version received: 30 April 2013 – Accepted: 02 May 2013 – Published online: 19 June 2013.)
Bulletin of the World Health Organization 2013;91:585-592. doi: http://dx.doi.org/10.2471/BLT.12.113837 [PDF]
Cervical cancer is a major public health problem: globally it is associated with over 560 000 new cases and around 275 000 deaths each year, more than 85% of which are in developing countries.1 Systematic, organized screening programmes for cervical cancer have had limited success in low-resource settings.2 However, human papillomavirus (HPV) vaccines may offer a new strategy for prevention and recent studies indicate that vaccination can greatly reduce cervical cancer incidence and mortality.3,4
As developing countries consider whether they can afford to introduce HPV vaccination, much attention has focused on the private sector price of two currently available HPV vaccines: the quadrivalent and bivalent formulations. These vaccines cost more than 100 United States dollars (US$) per dose, or more than US$ 300 for the three-dose series. Reported prices in the public sector have been declining and, in 2011, the manufacturer of the quadrivalent vaccine offered it at US$ 5 per dose to the GAVI Alliance for use in countries eligible for Alliance support. Low- and middle-income countries in Latin America can purchase HPV vaccine for US$ 10–US$ 15 per dose through the Revolving Fund of the Pan American Health Organization (PAHO). Young adolescent girls will benefit most from vaccine-based protection against cervical cancer because they are less likely than older girls to have been infected with the HPV types targeted by the vaccine. Although the price per vaccine dose will remain a key consideration when deciding whether to introduce the HPV vaccine, national governments and donors must also take into account the additional resources required for vaccine delivery.3
Between 2006 and 2010, the non-profit global health organization PATH collaborated with the governments of Peru, Uganda and Viet Nam to collect evidence that would assist government decision-making on whether and how to introduce HPV vaccination. The results of formative research5 were used to design demonstration projects of different types of vaccine delivery in partnership with each country’s ministry of health, subnational health and education sectors and other key stakeholders.6–10 Three delivery strategies were investigated: school-based outreach, health-centre-based outreach and integrated outreach, which made use of existing health services. The eligible population was selected by either school grade or age. The areas of implementation were limited geographically but large enough to cover complete administrative districts and to be broadly representative of each country’s population, thereby providing models that were suitable for scaling up in the future.
The strategies used in demonstration projects achieved high coverage among young adolescent girls and were found to be acceptable and feasible.11–17 For school-based outreach, vaccine coverage was 82.6% in Peru, 88.9% in Uganda and 87.8% in Viet Nam. In one project in Uganda, the HPV vaccination programme was integrated with Child Days Plus, a campaign that involves delivering vitamin A supplementation with one or more other child health services, and achieved 60.7% vaccine coverage. Full details of the demonstration projects’ structures and the vaccine strategies used are published elsewhere.11
The primary objective of this study was to report data on the cost of different HPV vaccination strategies for young adolescent girls, a group that is not routinely targeted by other vaccinations or health interventions18,19 The data were obtained from demonstration projects in Peru, Uganda and Viet Nam. A secondary objective was to estimate the financial cost of implementing national HPV vaccination programmes in these countries.
The feasibility and cost of HPV vaccination in young adolescent girls was assessed in a sample of the facilities that took part in demonstration projects in Peru, Uganda and Viet Nam.12,15 Facilities were selected on the basis of criteria associated with the geographical location and size of each facility, its expected workload and differences in coverage rates for diphtheria, tetanus and pertussis immunization. Details of the facilities surveyed for the cost analysis in each country are given in Table 1. In addition to the facility surveys, interviews were carried out with Expanded Programme on Immunization (EPI) managers at national, state or regional, provincial, and district or block administrative levels.
Table 1. Human papillomavirus vaccination of young adolescent girls in Peru, Uganda and Viet Nam, 2008–2010
Cost data were collected using the ingredients-based costing methods recommended by World Health Organization (WHO) guidelines.20 After the second or third round of HPV vaccination, project staff interviewed EPI managers and health-care personnel about the resources used for the most recent vaccination round. Data were obtained by direct observation on, for example, the activities of, and time spent by, personnel during community mobilization and vaccination sessions, the cold-chain equipment used to store HPV vaccine and the types of vehicle used to distribute vaccine or transport health-care workers to vaccination sites. These data were combined with price and expenditure data to estimate start-up and recurrent costs for service delivery. The potential financial costs of scaling up HPV vaccination were estimated by extrapolating the data collected on resource use and costs. Any expenses related to project activities that would not normally have occurred during the introduction of a new vaccine, such as extensive planning, supervision, coordination and evaluation, were excluded from the analysis.
In all countries, start-up activities were carried out in accordance with WHO guidelines for the introduction of a new vaccine.21 Activities included microplanning; information, education and communication; training of health-care workers; and community mobilization and sensitization. Start-up costs were treated as fixed costs because, although start-up activities typically occur in the first or second year of a vaccine’s introduction, they influence the provision and use of services beyond the pilot phase. Our analysis included all expenses associated with training workshops, except the salaries of the health-care workers who received training. Start-up costs were estimated for each level of the health-care system, annualized over 5 years and distributed proportionately across the number of doses delivered in the three vaccination rounds.
Recurrent costs comprised the cost of: staff time required for HPV vaccination, including salaries and allowances; injection devices and supplies; waste disposal and management; and vaccine transport, storage and distribution. In all three countries, health-care workers received a per diem payment and travel allowances for HPV vaccination, regardless of the delivery strategy.
Annualized depreciation for capital goods was calculated for the vehicles and cold-chain equipment required to transport and store vaccines. The number of useful life-years of capital goods varied by country and depended on the type of vehicle or cold chain equipment used. A standard discount rate of 3% was used to annualize capital costs. Cost data were collected in each country’s national currency and converted to US$ using the exchange rate for the year of collection: US$ 1.00 equalled 3.1 Peruvian soles in 2008, 1946 Ugandan shillings in 2009 and 19 000 Vietnamese dongs in 2010. All cost estimates were adjusted to 2009 US$ using the Consumer Price Index.22
The cost analysis was performed from a government perspective and we assumed that a national HPV vaccination programme would provide vaccine without cost to beneficiaries. For each country, we calculated the economic cost, which was defined as the cost of all resources used regardless of payer, from the average cost per dose for the resources used at the health centre level and added the average cost per dose for the resources used at the national, state or regional, provincial, and district or block level, by geographical region. In estimating the total economic cost of the vaccination programme, we derived a weighted average cost per dose, which took into account the population living in different zones in each geographical region, and multiplied it by the total number of doses delivered. Subsequently, the incremental cost per fully immunized girl was calculated by dividing the total economic cost by the number of girls who received all three vaccine doses. In our study, the calculation took into account the dropout rate between doses, which was less than 3% in Peru and Viet Nam and 6% in Uganda.
We also estimated the annual incremental financial outlay needed to implement a nationwide HPV vaccination programme, where the financial outlay was defined as the actual expenditure on all goods and services. Since we assumed that currently available human resources and the capacity of the existing vaccine supply chain were sufficient for the programme, we omitted capital depreciation and salary costs shared with existing immunization or other health services. We applied the financial delivery cost per dose to a single cohort of 10-year-old girls and assumed 80% coverage, as this was the average coverage achieved in the demonstration projects.11 We also included vaccine costs: the cost per dose for Uganda and Viet Nam was US$ 0.20, which is the current country co-payment for the procurement of vaccines for poor and intermediate countries through the GAVI Alliance; the cost for Peru was US$ 14.00 per dose, which is the cost for middle-income developing countries through PAHO’s Revolving Fund.23,24 In accordance with GAVI Alliance policy,24,25 a handling fee of 4% was added to the value of the co-payment for Uganda and Viet Nam. For Peru, a 3% PAHO Revolving Fund fee and a 3% supplement for freight and insurance were added to the cost of the vaccine.26 Also added was a 5% allowance for wastage in all countries.
Table 2 presents the number of doses administered and the number of girls who were fully immunized in the demonstration projects, by country and vaccination strategy, and lists the economic and financial costs of vaccination derived using these figures. Data were processed and analysed using Excel (Microsoft, Redmond, United States of America).
Table 2. Incremental cost of delivering human papillomavirus vaccine to young adolescent girls in demonstration projects in Peru, Uganda and Viet Nam, 2008–2010
The average economic delivery cost per HPV vaccine dose ranged from US$ 1.44 for integrated outreach in Uganda to US$ 3.88 for school-based outreach in Peru (Table 2). In general, vaccination programmes delivered in schools had a higher economic cost than those delivered in health centres or via integrated outreach. However, in Viet Nam there was only a small difference in economic cost between school-based outreach and health-centre-based outreach: US$ 2.08 versus US$ 1.92 per dose, respectively. A larger difference in cost between delivery strategies was observed in Uganda: the economic cost of school-based outreach was US$ 3.15 per dose, compared with US$ 1.44 per dose for integrated outreach. The average incremental economic cost per fully immunized girl was highest with school-based outreach in Peru and Uganda, at US$ 11.69 and US$ 10.09, respectively; it was lowest with integrated outreach in Uganda, at US$ 5.20.
The average financial delivery cost per dose was both highest and lowest in Uganda: US$ 1.11 with integrated outreach and US$ 2.10 with school-based outreach. Correspondingly, the average financial cost per fully immunized girl in the country ranged from US$ 4.01 with integrated outreach to US$ 6.73 for school-based outreach.
The profiles of the economic cost of an HPV vaccine dose for different delivery strategies in Peru, Uganda and Viet Nam are shown in Fig. 1. Start-up costs contributed the largest share – approximately 60% – of the cost for the two delivery strategies used in Viet Nam but only 30 to 40% of the cost in Peru and Uganda. Information, education and communication activities and community mobilization and sensitization accounted for approximately 40% of start-up costs, whereas staff training and microplanning accounted for 25 to 30%. All other costs were classified as recurrent delivery costs. Personnel costs formed the largest component of these costs, except for integrated outreach in Uganda, where salary costs were low because they were shared with the Child Days Plus campaign. Other important recurrent costs were associated with monitoring the programme and facilitating adverse event reporting.
Fig. 1. Profile of the economic cost of human papillomavirus vaccination strategies for young adolescent girls, Peru, Uganda and Viet Nam, 2008–2010
More detailed profiles of both economic and financial costs are provided in Appendices A, B, C, D and E (available at: http://www.rho.org/files/PATH-WHO-Bulletin-HPV-vac-delivery-costs-appendices-2012.pdf). The profiles of financial and economic costs were similar. The largest component of the financial costs was the start-up costs, followed by personnel allowances and the cost of supplies.
Outlay for national programmes
The incremental annual financial outlays needed in Peru, Uganda and Viet Nam to implement nationwide HPV vaccination programmes that would achieve 80% coverage are shown in Table 3. The highest financial outlay was for school-based outreach in Peru: US$ 14 438 519, which comprised 13% of the country’s total estimated budget for immunization in 2009. The lowest outlay was for integrated outreach in Uganda: US$ 1 400 179 or 4% of the planned immunization budget for 2009. School-based outreach in Uganda would cost US$ 2 443 243 (i.e. 7% of the immunization budget). In Viet Nam, school-based outreach would cost slightly more than health-centre-based outreach and both strategies would have accounted for 10 to 11% of the country’s immunization budget in 2009.
Table 3. Incremental annual financial cost of nationwide human papillomavirus vaccination for young adolescent girls, Peru, Uganda and Viet Nam, 2008–2010
This analysis provides new information on the delivery cost of HPV vaccination in three low-resource countries that used school-based, health-centre-based and integrated outreach for vaccine delivery. The average economic delivery cost per dose of fully vaccinating around 80% of eligible girls ranged from US$ 1.44 for integrated outreach in Uganda to US$ 3.88 for school-based outreach in Peru. These figures are higher than the published cost of delivering vaccines in traditional EPI schedules, which ranges from US$ 0.75 to US$ 1.40 per dose, depending on vaccine, country and the year of the study.27–32
In Uganda, school-based outreach cost more than integrated outreach primarily because of personnel (e.g. payment for travelling time and allowances) and transportation costs. However, coverage was higher with school-based outreach than integrated outreach: 88.9% versus 60.9%, respectively. In Viet Nam, the difference in the cost of school- and health-centre-based strategies was not as great because each required substantial personnel time and other resources to raise awareness among teachers, parents and communities about the benefits of HPV vaccine.
Our findings are consistent with those reported in the literature, which show that the cost of vaccination per fully immunized child varies according to the mix of delivery strategies used, the cost of key inputs (e.g. personnel and transportation) and the scale of the programme.32 In addition, the variation in cost reflects several key contextual factors, such as national income level, which affects public health service costs and personnel salaries, and health system policies and programmes, which influence country-specific implementation plans and lead to variations in resource use.6–10,12 For example, countries used a variety of approaches and materials for microplanning, community sensitization, raising awareness and staff training. In Peru, Uganda and Viet Nam, national immunization programmes scheduled separate microplanning and training activities for HPV vaccination at multiple tiers of the health system rather than integrating them with scheduled meetings and used an established training-of-trainers strategy. In addition, in the demonstration projects, even workers based at health centres received per diem payments for the days on which they administered HPV vaccine to girls.
Start-up costs were high for the demonstration projects in all countries, with the bulk of these costs being due to activities for raising awareness and community mobilization. Investment in communications increased the community’s acceptance of vaccination, which translated into a high vaccine uptake.33 The cost of introducing new vaccines was similarly high in other settings. For example, the start-up cost for the pentavalent vaccine in Ethiopia was an additional US$ 4.7 million, or US$ 1.50 per fully vaccinated child.34 In Cambodia, the introduction of Japanese encephalitis vaccine cost approximately US$ 1.50 per child, or 60% of the total cost per child vaccinated.35
The economies of scale that occur in national HPV vaccination programmes mean that the unit cost of the development and production of materials for information, education and communication, and for training and the unit cost of community mobilization meetings at the national or subnational levels, are likely to be lower than in a demonstration project. Since the costs of these activities tends to be fixed, they will be spread over a higher number of delivered doses when a country’s vaccination programme is scaled up, resulting in a lower unit cost per dose. In addition, total start-up costs should also decline, depending on how quickly a country decides to introduce and scale up HPV vaccination.
Evidence from the HPV vaccine demonstration projects indicates that the cost per dose was lower when vaccine delivery was integrated into existing health services. For example, in Uganda, personnel and transportation costs were lower with integrated outreach than school-based outreach because HPV vaccination took place alongside an existing programme delivering other health services. Integrating the distribution of HPV vaccine and injection devices with the distribution of other EPI vaccines and immunization supplies is likely to reduce the delivery cost per dose. However, any reduction will depend on existing vaccine storage and transport capacity in the country and on whether the HPV vaccine is introduced in conjunction with other new vaccines, such as rotavirus or pneumococcal vaccine.
In the immediate future, considerable government support will be needed to pay for the delivery of HPV vaccine as well as for its purchase through either the GAVI Alliance or another public sector provider. Although immunization budgets have been increasing recently in countries that took part in the demonstration projects, national decision-makers have noted that co-financing a national HPV vaccination programme is challenging.32 Our analysis indicates that introducing HPV vaccination for young adolescent girls could increase national immunization budgets by 5 to 13%. Consequently, countries will need to allocate public health resources and seek greater support from external donors to cover these costs. Peru increased its national immunization budget by 500% between 2006 and 201036 and, in 2011, the country successfully funded and launched a nationwide HPV vaccination programme.37 In 2012, the GAVI Alliance announced support for introducing the HPV vaccine in low-income countries and Uganda has applied for continued support.38,39
Our cost estimates for countries that took part in the demonstration projects have several limitations. First, in some instances it was not possible to identify all the costs that were integral to the projects but that may not make up the same proportion of the costs for a national immunization campaign. Second, although the same methods were used for all countries and costs were calculated in the same way, some costs may have been unique to a particular country and may have affected both the absolute cost per dose and the cost profile. Third, we omitted labour costs for volunteers who participated in community mobilization and for the time health-care workers spent in training or microplanning sessions. These costs are likely to vary across countries and their inclusion may change relative costs and cost profiles. Finally, the estimated financial outlays for introducing national HPV vaccination programmes are merely indicative, since scaling up a programme to the national level may involve additional costs related to the development of a comprehensive cervical cancer prevention programme and to investment in human and capital resources that are not captured in this analysis.
In conclusion, the cost of delivering HPV vaccine to young adolescent girls is likely to be higher than the cost of delivering vaccines currently included in the EPI schedule but may decline as delivery becomes integrated into immunization and school-based health services. Our findings can assist donors and national governments estimate budgetary requirements and can provide information on the resources needed to introduce and eventually scale up HPV vaccination.
This project was funded in whole by a grant from the Bill & Melinda Gates Foundation.
- Ferlay J, Shin HR, Bray F, Forman D, Mathers C, Parkin DM. Estimates of worldwide burden of cancer in 2008: GLOBOCAN 2008. Int J Cancer 2010; 127: 2893-917 http://dx.doi.org/10.1002/ijc.25516 pmid: 21351269.
- World Health Organization [Internet]. Immunization, vaccines and biologicals. Human papillomavirus (HPV). Geneva: World Health Organization. Available from: http://www.who.int/immunization/topics/hpv/en/ [accessed 16 June 2013].
- Goldie SJ, O’Shea M, Campos NG, Diaz M, Sweet S, Kim SY. Health and economic outcomes of HPV 16,18 vaccination in 72 GAVI-eligible countries. Vaccine 2008; 26: 4080-93 http://dx.doi.org/10.1016/j.vaccine.2008.04.053 pmid: 18550229.
- Marra F, Cloutier K, Oteng B, Marra C, Ogilvie G. Effectiveness and cost effectiveness of human papillomavirus vaccine: a systematic review. Pharmacoeconomics 2009; 27: 127-47 http://dx.doi.org/10.2165/00019053-200927020-00004 pmid: 19254046.
- Bingham A, Janmohamed A, Bartolini R, Creed-Kanashiro H, Katahoire A, Khan I, et al., et al. An approach to formative research in HPV vaccine introduction planning in low-resource settings. Open Vaccine J 2009; 2: 1-16 http://dx.doi.org/10.2174/1875035400902010001.
- Katahoire RA, Jitta J, Kivumbi G, Murokora D, Arube WJ, Siu G, et al., et al. An assessment of the readiness for introduction of the HPV vaccine in Uganda. Afr J Reprod Health 2008; 12: 159-72 pmid: 19435020.
- Bartolini RM, Drake JK, Creed-Kanashiro HM, Díaz-Otoya MM, Mosqueira-Lovón NR, Penny ME, et al., et al. Investigación formativa para diseñar estrategias para la introducción de la vacuna contra el VPH en el Perú. [Formative research to shape HPV vaccine introduction strategies in Peru]. Salud Publica Mex 2010; 52: 226-33 http://dx.doi.org/http://dx.10.1590/S0036-36342010000300007.
- Nghi NQ, Lamontagne DS, Bingham A, Rafiq M, Mai TP, Lien N, et al., et al. Human papillomavirus vaccine introduction in Vietnam: formative research findings. Sex Health 2010; 7: 262-70 http://dx.doi.org/10.1071/SH09123 pmid: 20719213.
- Jacob M, Mawar N, Menezes L, Kaipilyawar S, Gandhi S, Khan I, et al., et al. Assessing the environment for introduction of human papillomavirus vaccine in India. Open Vaccine J 2010; 3: 96-107 http://dx.doi.org/10.2174/1875035401003010096.
- Biellik R, Levin C, Mugisha E, LaMontagne DS, Bingham A, Kaipilyawar S, et al., et al. Health systems and immunization financing for human papillomavirus vaccine introduction in low-resource settings. Vaccine 2009; 27: 6203-9 http://dx.doi.org/10.1016/j.vaccine.2009.08.003 pmid: 19698808.
- LaMontagne DS, Barge S, Le NT, Mugisha E, Penny ME, Gandhi S, et al., et al. Human papillomavirus vaccine delivery strategies that achieved high coverage in low- and middle-income countries. Bull World Health Organ 2011; 89: 821-830B. http://dx.doi.org/10.2471/BLT.11.08986 pmid: 22084528.
- Penny M, Bartolini R, Mosqueira NR, LaMontagne DS, Mendoza MA, Ramos I, et al., et al. Strategies to vaccinate against cancer of the cervix: feasibility of a school-based HPV vaccination program in Peru. Vaccine 2011; 29: 5022-30 http://dx.doi.org/10.1016/j.vaccine.2011.04.078 pmid: 21609748.
- Bartolini RM, Winkler JL, Penny ME, LaMontagne DS. Parental acceptance of HPV vaccine in Peru: a decision framework. PLoS One 2012; 7: e48017 http://dx.doi.org/10.1371/journal.pone.0048017 pmid: 23144719.
- Cover JK, Nghi NQ, LaMontagne DS, Huyen DT, Hien NT, Nga T. Acceptance patterns and decision-making for human papillomavirus vaccination among parents in Vietnam: an in-depth qualitative study post-vaccination. BMC Public Health 2012; 12: 629 http://dx.doi.org/10.1186/1471-2458-12-629 pmid: 22877158.
- PATH, National Institute of Hygiene and Epidemiology & National Center for Health Education and Communication. HPV vaccination in Southeast Asia: lessons learned from a pilot program in Vietnam. Seattle: PATH; 2012. Available from: http://www.rho.org/files/rb4/HPV_lessons_learned_Vietnam_PATH_2012.pdf [accessed 16 June 2013].
- Katahoire AR, Murokora D, Arube-Wani J, Mugisha E, LaMontagne DS. Acceptability of HPV vaccine among young adolescent girls in Uganda: young people’s perspectives count. Intl J Child Adolesc Health 2013; 6: .
- PATH, Child Health and Development Centre & Uganda National Expanded Program on Immunization. HPV vaccination in Africa: lessons learned from a pilot program in Uganda. Seattle: PATH; 2011. Available from: http://www.rho.org/files/rb2/HPV_lessons_learned_Uganda_PATH_2011.pdf [accessed 16 June 2013].
- HPV vaccine adoption in developing countries: cost and financing issues. New York & Seattle: International AIDS Vaccine Initiative & PATH; 2007.
- Temin M, Levin R. Start with a girl: a new agenda for global health. Washington: Center for Global Development; 2009. Available from: www.cgdev.org/files/1422899_file_Start_with_a_Girl_FINAL.pdf [accessed 7 June 2013].
- Guidelines for estimating costs of introducing new vaccines into the national immunization system. Geneva: World Health Organization; 2002 (WHO/V&B/02.11).
- Preparing for the introduction of HPV vaccines: policy and programme guidance for countries. Geneva: World Health Organization; 2006.
- The World Bank [Internet]. Consumer price index (2005 = 100). Washington: The World Bank; 2012. Available from: http://data.worldbank.org/indicator/FP.CPI.TOTL [accessed 7 June 2013].
- Pan American Health Organization. PAHO Revolving Fund: vaccine and syringe prices, 2011. Immunization Newsletter 2011; XXXIII: 5.
- Co-financing new vaccines and sustainability: meeting report of the Africa Region workshop. New York: United Nations Children’s Fund; 2009.
- GAVI Alliance [Internet]. Co-financing policy. Geneva: GAVI Alliance; 2010. Available from: www.gavialliance.org/about/governance/programme-policies/co-financing [accessed 7 June 2013].
- Operating procedures of the PAHO Revolving Fund for the purchase of vaccines, syringes and other related supplies. Washington: Pan American Health Organization; 2008.
- Acharya A, Diaz-Ortega JL, Tambini G, de Quadros C, Arita I. Cost-effectiveness of measles elimination in Latin America and the Caribbean: a prospective analysis. Vaccine 2002; 20: 3332-41 http://dx.doi.org/10.1016/S0264-410X(02)00296-7 pmid: 12213403.
- Walker D, Mosqueira NR, Penny ME, Lanata CF, Clark AD, Sanderson CF, et al., et al. Variation in the costs of delivering routine immunization services in Peru. Bull World Health Organ 2004; 82: 676-82 pmid: 15628205.
- Griffiths UK, Wolfson LJ, Quddus A, Younus M, Hafiz RA. Incremental cost-effectiveness of supplementary immunization activities to prevent neonatal tetanus in Pakistan. Bull World Health Organ 2004; 82: 643-51 pmid: 15628201.
- Dayan GH, Cairns L, Sangrujee N, Mtonga A, Nguyen V, Strebel P. Cost-effectiveness of three different vaccination strategies against measles in Zambian children. Vaccine 2004; 22: 475-84 http://dx.doi.org/10.1016/j.vaccine.2003.07.007 pmid: 14670330.
- Hoang MV, Nguyen TB, Kim BG, Dao LH, Nguyen TH, Wright P. Cost of providing the expanded programme on immunization: findings from a facility-based study in Viet Nam, 2005. Bull World Health Organ 2008; 86: 429-34 http://dx.doi.org/10.2471/BLT.07.045161 pmid: 18568271.
- Brenzel L, Wolfson LJ, Fox-Rusby J, Miller M, Halsey NA. Vaccine preventable diseases. In: Jamison DT, Breman JG, Measham AR, Alleyne G, Claeson M, Evans DB, et al., editors. Disease control priorities in developing countries. 2nd ed. Washington: The World Bank; 2006.
- Galagan SR, Paul P, Menezes L, LaMontagne DS. Influences on parental acceptance of HPV vaccination in demonstration projects in Uganda and Vietnam. Vaccine 2013.
- Griffiths UK, Korczak VS, Ayalew D, Yigzaw A. Incremental system costs of introducing combined DTwP-hepatitis B-Hib vaccine into national immunization services in Ethiopia. Vaccine 2009; 27: 1426-32 http://dx.doi.org/10.1016/j.vaccine.2008.12.037 pmid: 19146901.
- Touch S, Suraratdecha C, Samnang C, Heng S, Gazley L, Huch C, et al., et al. A cost-effectiveness analysis of Japanese encephalitis vaccine in Cambodia. Vaccine 2010; 28: 4593-9 http://dx.doi.org/10.1016/j.vaccine.2010.04.086 pmid: 20470803.
- Perú, Ministerio de Economía y Finanzas [Internet]. Presupuesto público. Lima: MEF; 2013. Available from: www.mef.gob.pe [accessed 7 June 2013].
- Ministerio de Salud [Internet]. Llega al Perú primer lote de vacunas contra el cáncer de cuello uterino. [The first batch of cervical cancer vaccines arrives in Peru]. Lima: Ministerio de Salud; 2011. Spanish. Available from: http://www.minsa.gob.pe/portada/prensa/notas_auxiliar.asp?nota=9896 [accessed 7 June 2013].
- GAVI Alliance [Internet]. Human papillomavirus vaccine support. Geneva: GAVI; 2013. Available from: http://www.gavialliance.org/support/nvs/human-papillomavirus-vaccine-support/ [accessed 16 June 2013]
- Okino P. First Lady launches cervical cancer fight. Kampala: New Vision 7 September 2012. Available from: http://www.newvision.co.ug/news/635003-first-lady-launches-cervical-cancer-vaccination-drive.html [accessed 7 June 2013]