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Review

Varicella vaccination - the global experience

, ORCID Icon, , , &
Pages 833-843 | Received 31 Mar 2017, Accepted 14 Jun 2017, Published online: 13 Jul 2017

References

  • Centers for Disease Control and Prevention. Varicella; The Pink Book (13th Edition). Available from: www.cdc.gov/vaccines/pubs/pinkbook/downloads/varicella.pdf. [Accessed on Dec 5th, 2016].
  • Herman L, Levin MJ, Rehm S. Shedding Light on Shingles: the Power of Prevention. Am J Med. 2016;129:1137.
  • Varicella Vaccination in the European Union. Available from: http://ecdc.europa.eu/en/publications/Publications/Varicella-Guidance-2015.pdf. [Accessed on Dec 6th, 2016].
  • Bozzola E, Bozzola M. Varicella complications and universal immunization. J Pediatr (Rio J). 2016;92:328–330.
  • Varicella and herpes Zoster vaccines. WHO position paper, June 2014. Wkly Epidemiol Rec. 2014;89:265–287.
  • Shah SS, Wood SM, Luan X, et al. Decline in varicella-related ambulatory visits and hospitalizations in the United States since routine immunization against varicella. Pediatr Infect Dis J. 2010;29:199–204.
  • Marin M, Zhang JX, Seward JF. Near elimination of varicella deaths in the US after implementation of the vaccination program. Pediatrics. 2011;128:214–220.
  • Boelle PY, Hanslik T. Varicella in non-immune persons: incidence, hospitalization and mortality rates. Epidemiol Infect. 2002;129:599–606.
  • Helmuth IG, Poulsen A, Suppli CH, et al. Varicella in Europe-A review of the epidemiology and experience with vaccination. Vaccine. 2015;33:2406–2413.
  • Hobbelen PH, Stowe J, Amirthalingam G, et al. The burden of hospitalisation for varicella and herpes zoster in England from 2004 to 2013. J Infect. 2016;73:241–253.
  • Heininger U, Seward JF. Varicella. Lancet. 2006;368:1365–1376.
  • Widgren K, Giesecke J, Lindquist L, et al. The burden of chickenpox disease in Sweden. BMC Infect Dis. 2016;16:666.
  • Banz K, Wagenpfeil S, Neiss A, et al. The burden of varicella in Germany. Potential risks and economic impact. Eur J Health Econ. 2004;5:46–53.
  • Carapetis JR, Russell DM, Curtis N. The burden and cost of hospitalised varicella and zoster in Australian children. Vaccine. 2004;23:755–761.
  • Somekh E, Dalal I, Shohat T, et al. The burden of uncomplicated cases of chickenpox in Israel. J Infect. 2002;45:233–236.
  • Unim B, Saulle R, Boccalini S, et al. Economic evaluation of Varicella vaccination: results of a systematic review. Hum Vaccin Immunother. 2013;9:1932–1942.
  • Varicella and herpes zoster vaccines: WHO position paper, June. Recommendations. Vaccine. 2014;2016(34):198–199.
  • Kreth HW, Lee BW, Kosuwon P, et al. Sixteen years of global experience with the first refrigerator-stable varicella vaccine (Varilrix). Biodrugs. 2008;22:387–402.
  • Bonanni P, Gershon A, Gershon M, et al. Primary versus secondary failure after varicella vaccination: implications for interval between 2 doses. Pediatr Infect Dis J. 2013;32:e305–13.
  • Marin M, Guris D, Chaves SS, et al. Prevention of varicella: recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR Recomm Rep. 2007;56:1–40.
  • Kurugol Z, Halicioglu O, Koc F, et al. Varicella rates among unvaccinated and one-dose vaccinated healthy children in Izmir, Turkey. Int J Infect Dis. 2011;15:e475–80.
  • Pieri L, Porchia BR, Pieralli F, et al. Assessment of the effectiveness of the universal varicella vaccination program in Toscana (Italy), in the period 2010-2013. Epidemiol Prev. 2015;39:119–123.
  • Spackova M, Wiese-Posselt M, Dehnert M, et al. Comparative varicella vaccine effectiveness during outbreaks in day-care centres. Vaccine. 2010;28:686–691.
  • Tafuri S, Martinelli D, De Palma M, et al. Report of varicella outbreak in a low vaccination coverage group of otherwise healthy children in Italy: the role of breakthrough and the need of a second dose of vaccine. Vaccine. 2010;28:1594–1597.
  • Marin M, Marti M, Kambhampati A, et al. Global varicella vaccine effectiveness: a meta-analysis. Pediatrics. 2016;137:1–10.
  • Banz K, Iseli A, Aebi C, et al. Economic evaluation of varicella vaccination in Swiss children and adolescents. Hum Vaccin. 2009;5:847–857.
  • Maman K, Zollner Y, Greco D, et al. The value of childhood combination vaccines: from beliefs to evidence. Hum Vaccin Immunother. 2015;11:2132–2141.
  • Holl K, Sauboin C, Amodio E, et al. Coverage, efficacy or dosing interval: which factor predominantly influences the impact of routine childhood vaccination for the prevention of varicella? A model-based study for Italy. BMC Public Health. 2016;16:1103.
  • RGlaxoSmithKline. VarilrixTM Summary of Product Characteristics 2015. Available from: https://www.medicines.org.uk/emc/medicine/9787. [Accessed on Dec 6th, 2016].
  • Sanofi Pasteur MSD Limited. VarivaxTM Summary of Product Characteristics 2013. Available from: https://www.medicines.org.uk/emc/medicine/15264. [Accessed on Dec 6th, 2016].
  • GlaxoSmithKline. Priorix-TetraTM Summary of Product Characteristics 2014. Available from: http://www.hpra.ie/img/uploaded/swedocuments/LicenseSPC_PA1077-117-003_20052014100041.pdf. [Accessed on Dec 6th, 2016].
  • Sanofi Pasteur MSD ProQuadTM Summary of Product Characteristics 2014. Available from: http://www.ema.europa.eu/docs/en_GB/document_library/EPAR_-_Product_Information/human/000622/WC500044070.pdf. [Accessed on Dec 6th, 2016].
  • Ma SJ, Li X, Xiong YQ, et al. Combination measles-mumps-rubella-varicella vaccine in healthy children: a systematic review and meta-analysis of immunogenicity and safety. Medicine (Baltimore). 2015;94:e1721.
  • Wang L, Zhu L, Zhu H. Efficacy of varicella (VZV) vaccination: an update for the clinician. Ther Adv Vaccines. 2016;4:20–31.
  • Kuter B, Matthews H, Shinefield H, et al. Ten year follow-up of healthy children who received one or two injections of varicella vaccine. Pediatr Infect Dis J. 2004;23:132–137.
  • Prymula R, Bergsaker MR, Esposito S, et al. Protection against varicella with two doses of combined measles-mumps-rubella-varicella vaccine versus one dose of monovalent varicella vaccine: a multicentre, observer-blind, randomised, controlled trial. Lancet. 2014;383:1313–1324.
  • Garcia Cenoz M, Castilla J, Chamorro J, et al. Impact of universal two-dose vaccination on varicella epidemiology in Navarre, Spain, 2006 to 2012. Euro Surveill. 2013;18:20552.
  • Boccalini S, Bonanni P, Bechini A. Preparing to introduce the varicella vaccine into the Italian immunisation programme: varicella-related hospitalisations in Tuscany, 2004-2012. Euro Surveill. 2016;21:pii=30257.
  • Luyten J, Ogunjimi B, Beutels P. Varicella-zoster virus vaccination under the exogenous boosting hypothesis: two ethical perspectives. Vaccine. 2014;32:7175–7178.
  • Betta M, Laurino M, Pugliese A, et al. Perspectives on optimal control of varicella and herpes zoster by mass routine varicella vaccination. Proc Biol Sci. 2016;283:20160054.
  • Gershon AA, Breuer J, Cohen JI, et al. Varicella zoster virus infection. Nat Rev Dis Primers. 2015;1:15016.
  • Australian Government Department of Health and Ageing. Immunise Australia Program (2016). Available from: http://www.immunise.health.gov.au/internet/immunise/publishing.nsf/Content/Handbook10-home~handbook10part4~handbook10-4-22. [Accessed on Dec 6th, 2016].
  • Hanquet G, Valenciano M, Simondon F, et al. Vaccine effects and impact of vaccination programmes in post-licensure studies. Vaccine. 2013;31:5634–5642.
  • Vazquez M, LaRussa PS, Gershon AA, et al. Effectiveness over time of varicella vaccine. Jama. 2004;291:851–855.
  • Mahamud A, Wiseman R, Grytdal S, et al. Challenges in confirming a varicella outbreak in the two-dose vaccine era. Vaccine. 2012;30:6935–6939.
  • Shapiro ED, Vazquez M, Esposito D, et al. Effectiveness of 2 doses of varicella vaccine in children. J Infect Dis. 2011;203:312–315.
  • Liese JG, Cohen C, Rack A, et al. The effectiveness of varicella vaccination in children in Germany: a case-control study. Pediatr Infect Dis J. 2013;32:998–1004.
  • Miron D, Lavi I, Kitov R, et al. Vaccine effectiveness and severity of varicella among previously vaccinated children during outbreaks in day-care centers with low vaccination coverage. Pediatr Infect Dis J. 2005;24:233–236.
  • Lee YH, Choe YJ, Cho SI, et al. Effectiveness of varicella vaccination program in preventing laboratory-confirmed cases in children in Seoul, Korea. J Korean Med Sci. 2016;31:1897–1901.
  • Bayer O, Heininger U, Heiligensetzer C, et al. Metaanalysis of vaccine effectiveness in varicella outbreaks. Vaccine. 2007;25:6655–6660.
  • Seward JF, Marin M, Vazquez M. Varicella vaccine effectiveness in the US vaccination program: a review. J Infect Dis. 2008;197(Suppl 2):S82–9.
  • Siedler A, Rieck T, Tolksdorf K. Strong additional effect of a second varicella vaccine dose in children in Germany, 2009-2014. J Pediatr. 2016;173:202–206.
  • Fu C, Wang M, Liang J, et al. The effectiveness of varicella vaccine in China. Pediatr Infect Dis J. 2010;29:690–693.
  • Wang Z, Yang H, Li K, et al. Single-dose varicella vaccine effectiveness in school settings in China. Vaccine. 2013;31:3834–3838.
  • Baxter R, Ray P, Tran TN, et al. Long-term effectiveness of varicella vaccine: a 14-Year, prospective cohort study. Pediatrics. 2013;131:e1389–96.
  • Avila-Aguero ML, Ulloa-Gutierrez R, Camacho-Badilla K, et al. Varicella prevention in Costa Rica: impact of a one-dose schedule universal vaccination. Expert Rev Vaccines. 2016;16:229–234.
  • Amodio E, Tramuto F, Cracchiolo M, et al. The impact of ten years of infant universal Varicella vaccination in Sicily, Italy (2003-2012). Hum Vaccin Immunother. 2015;11:236–239.
  • Baxter R, Tran TN, Ray P, et al. Impact of vaccination on the epidemiology of varicella: 1995-2009. Pediatrics. 2014;134:24–30.
  • Siedler A, Arndt U. Impact of the routine varicella vaccination programme on varicella epidemiology in Germany. Euro Surveill. 2010;15:pii=19530.
  • Streng A, Grote V, Carr D, et al. Varicella routine vaccination and the effects on varicella epidemiology - results from the Bavarian Varicella Surveillance Project (BaVariPro), 2006-2011. BMC Infect Dis. 2013;13:303.
  • Pozza F, Piovesan C, Russo F, et al. Impact of universal vaccination on the epidemiology of varicella in Veneto, Italy. Vaccine. 2011;29:9480–9487.
  • Mullins J, Kudish K, Sosa L, et al. Continuing decline in varicella incidence after the 2-dose vaccination recommendation-connecticut, 2009-2014. Open Forum Infect Dis. 2015;2:ofv150.
  • Jumaan AO, Yu O, Jackson LA, et al. Incidence of herpes zoster, before and after varicella-vaccination-associated decreases in the incidence of varicella, 1992-2002. J Infect Dis. 2005;191:2002–2007.
  • Chao DY, Chien YZ, Yeh YP, et al. The incidence of varicella and herpes zoster in Taiwan during a period of increasing varicella vaccine coverage, 2000-2008. Epidemiol Infect. 2012;140:1131–1140.
  • Chang LY, Huang LM, Chang IS, et al. Epidemiological characteristics of varicella from 2000 to 2008 and the impact of nationwide immunization in Taiwan. BMC Infect Dis. 2011;11:352.
  • Carville KS, Riddell MA, Kelly HA. A decline in varicella but an uncertain impact on zoster following varicella vaccination in Victoria, Australia. Vaccine. 2010;28:2532–2538.
  • Lopez AS, Zhang J, Brown C, et al. Varicella-related hospitalizations in the United States, 2000-2006: the 1-dose varicella vaccination era. Pediatrics. 2011;127:238–245.
  • Leung J, Harpaz R. Impact of the maturing varicella vaccination program on varicella and related outcomes in the United States: 1994-2012. J Pediatric Infect Dis Soc. 2016;5:395–402.
  • Siedler A, Dettmann M. Hospitalization with varicella and shingles before and after introduction of childhood varicella vaccination in Germany. Hum Vaccin Immunother. 2014;10:3594–3600.
  • Gil-Prieto R, Walter S, Gonzalez-Escalada A, et al. Different vaccination strategies in Spain and its impact on severe varicella and zoster. Vaccine. 2014;32:277–283.
  • De Martino Mota A, Carvalho-Costa FA. Varicella zoster virus related deaths and hospitalizations before the introduction of universal vaccination with the tetraviral vaccine. J Pediatr (Rio J). 2016;92:361–366.
  • Bechini A, Boccalini S, Baldo V, et al. Impact of universal vaccination against varicella in Italy. Hum Vaccin Immunother. 2015;11:63–71.
  • Waye A, Jacobs P, Tan B. The impact of the universal infant varicella immunization strategy on Canadian varicella-related hospitalization rates. Vaccine. 2013;31:4744–4748.
  • Heywood AE, Wang H, Macartney KK, et al. Varicella and herpes zoster hospitalizations before and after implementation of one-dose varicella vaccination in Australia: an ecological study. Bull World Health Organ. 2014;92:593–604.
  • Nguyen HQ, Jumaan AO, Seward JF. Decline in mortality due to varicella after implementation of varicella vaccination in the United States. N Engl J Med. 2005;352:450–458.
  • Guris D, Jumaan AO, Mascola L, et al. Changing varicella epidemiology in active surveillance sites–United States, 1995-2005. J Infect Dis. 2008;197(Suppl 2):S71–5.
  • Papaloukas O, Giannouli G, Papaevangelou V. Successes and challenges in varicella vaccine. Ther Adv Vaccines. 2014;2:39–55.
  • Van Hoek AJ, Melegaro A, Zagheni E, et al. Modelling the impact of a combined varicella and zoster vaccination programme on the epidemiology of varicella zoster virus in England. Vaccine. 2011;29:2411–2420.
  • World Health Organization. Immunization, vaccines and biologicals: varicella (2015). Available from: http://www.who.int/immunization/diseases/varicella/en/ [Accessed on Dec 6th, 2016].
  • Bialek SR, Perella D, Zhang J, et al. Impact of a routine two-dose varicella vaccination program on varicella epidemiology. Pediatrics. 2013;132:e1134–40.
  • Kuter BJ, Ngai A, Patterson CM, et al. Safety, tolerability, and immunogenicity of two regimens of Oka/Merck varicella vaccine (Varivax) in healthy adolescents and adults. Oka/Merck Varicella Vaccine Study Group. Vaccine. 1995;13:967–972.
  • Sperber SJ, Smith BV, Hayden FG. Serologic response and reactogenicity to booster immunization of healthy seropositive adults with live or inactivated varicella vaccine. Antiviral Res. 1992;17:213–222.
  • Brisson M, Edmunds WJ, Gay NJ, et al. Modelling the impact of immunization on the epidemiology of varicella zoster virus. Epidemiol Infect. 2000;125:651–669.
  • Oxman MN. Herpes zoster pathogenesis and cell-mediated immunity and immunosenescence. J Am Osteopath Assoc. 2009;109:S13–7.
  • Hope-Simpson RE. The nature of herpes zoster: a long-term study and a new hypothesis. Proc R Soc Med. 1965;58:9–20.
  • Horn J, Karch A, Damm O, et al. Current and future effects of varicella and herpes zoster vaccination in Germany - Insights from a mathematical model in a country with universal varicella vaccination. Hum Vaccin Immunother. 2016;12:1766–1776.
  • Gidding HF, Brisson M, Macintyre CR, et al. Modelling the impact of vaccination on the epidemiology of varicella zoster virus in Australia. Aust N Z J Public Health. 2005;29:544–551.
  • Karhunen M, Leino T, Salo H, et al. Modelling the impact of varicella vaccination on varicella and zoster. Epidemiol Infect. 2010;138:469–481.
  • Damm O, Ultsch B, Horn J, et al. Systematic review of models assessing the economic value of routine varicella and herpes zoster vaccination in high-income countries. BMC Public Health. 2015;15:533.
  • Van Lier A, Lugner A, Opstelten W, et al. Distribution of health effects and cost-effectiveness of varicella vaccination are shaped by the impact on herpes zoster. EBioMedicine. 2015;2:1494–1499.
  • Kawai K, Yawn BP, Wollan P, et al. Increasing Incidence of herpes zoster over a 60-year period from a population-based study. Clin Infect Dis. 2016;63:221–226.
  • Ragozzino MW, Melton LJ 3rd, Kurland LT, et al. Population-based study of herpes zoster and its sequelae. Medicine (Baltimore). 1982;61:310–316.
  • Yawn BP, Saddier P, Wollan PC, et al. A population-based study of the incidence and complication rates of herpes zoster before zoster vaccine introduction. Mayo Clin Proc. 2007;82:1341–1349.
  • Nelson MR, Britt HC, Harrison CM. Evidence of increasing frequency of herpes zoster management in Australian general practice since the introduction of a varicella vaccine. Med J Aust. 2010;193:110–113.
  • Patel MS, Gebremariam A, Davis MM. Herpes zoster-related hospitalizations and expenditures before and after introduction of the varicella vaccine in the United States. Infect Control Hosp Epidemiol. 2008;29:1157–1163.
  • Wu PY, Wu HD, Chou TC, et al. Varicella vaccination alters the chronological trends of herpes zoster and varicella. Plos One. 2013;8:e77709.
  • Yih WK, Brooks DR, Lett SM, et al. The incidence of varicella and herpes zoster in Massachusetts as measured by the Behavioral Risk Factor Surveillance System (BRFSS) during a period of increasing varicella vaccine coverage, 1998-2003. BMC Public Health. 2005;5:68.
  • Civen R, Marin M, Zhang J, et al. Update on incidence of herpes zoster among children and adolescents after implementation of varicella vaccination, antelope valley, CA, 2000 to 2010. Pediatr Infect Dis J. 2016;35:1132–1136.
  • Jardine A, Conaty SJ, Vally H. Herpes zoster in Australia: evidence of increase in incidence in adults attributable to varicella immunization? Epidemiol Infect. 2011;139:658–665.
  • Leung J, Harpaz R, Molinari NA, et al. Herpes zoster incidence among insured persons in the United States, 1993-2006: evaluation of impact of varicella vaccination. Clin Infect Dis. 2011;52:332–340.
  • Tanuseputro P, Zagorski B, Chan KJ, et al. Population-based incidence of herpes zoster after introduction of a publicly funded varicella vaccination program. Vaccine. 2011;29:8580–8584.
  • Civen R, Chaves SS, Jumaan A, et al. The incidence and clinical characteristics of herpes zoster among children and adolescents after implementation of varicella vaccination. Pediatr Infect Dis J. 2009;28:954–959.
  • Weinmann S, Chun C, Schmid DS, et al. Incidence and clinical characteristics of herpes zoster among children in the varicella vaccine era, 2005-2009. J Infect Dis. 2013;208:1859–1868.
  • Ogunjimi B, Van Damme P, Beutels P. Herpes zoster risk reduction through exposure to chickenpox patients: a systematic multidisciplinary review. Plos One. 2013;8:e66485.
  • Mullooly JP, Riedlinger K, Chun C, et al. Incidence of herpes zoster, 1997-2002. Epidemiol Infect. 2005;133:245–253.
  • Hambleton S, Steinberg SP, Larussa PS, et al. Risk of herpes zoster in adults immunized with varicella vaccine. J Infect Dis. 2008;197(Suppl 2):S196–9.
  • Hata A, Asanuma H, Rinki M, et al. Use of an inactivated varicella vaccine in recipients of hematopoietic-cell transplants. N Engl J Med. 2002;347:26–34.
  • Ogunjimi B, Willem L, Beutels P, et al. Integrating between-host transmission and within-host immunity to analyze the impact of varicella vaccination on zoster. Elife. 2015;4:e07116.
  • Poletti P, Melegaro A, Ajelli M, et al. Perspectives on the impact of varicella immunization on herpes zoster. A model-based evaluation from three European countries. Plos One. 2013;8:e60732.
  • Wood SM, Shah SS, Steenhoff AP, et al. Primary varicella and herpes zoster among HIV-infected children from 1989 to 2006. Pediatrics. 2008;121:e150–6.
  • Hales CM, Harpaz R, Joesoef MR, et al. Examination of links between herpes zoster incidence and childhood varicella vaccination. Ann Intern Med. 2013;159:739–745.
  • Shirane R, Tang H, Hayashi K, et al. Relationship between cell-mediated immunity to Varicella-Zoster virus and aging in subjects from the community-based Shozu Herpes Zoster study. J Med Virol. 2017;89:313–317.
  • Ogunjimi B, Theeten H, Hens N, et al. Serology indicates cytomegalovirus infection is associated with varicella-zoster virus reactivation. J Med Virol. 2014;86:812–819.
  • Guzzetta G, Poletti P, Merler S, et al. The epidemiology of herpes zoster after varicella immunization under different biological hypotheses: perspectives from mathematical modeling. Am J Epidemiol. 2016;183:765–773.
  • Centro de Vigilancia Epidemiologica “Prof. Alexandre Vranjac”. Calendário de Vacinação (2016). Available from: http://portal.saude.sp.gov.br/resources/cve-centro-de-vigilancia-epidemiologica/areas-de-vigilancia/imunizacao/doc/calendario16_vacinacao.pdf [Accessed on Dec 6th, 2016].
  • Ministerio de Salud Presidencia de la Nación. Calendario Nacional de Vacunación de la República Argentina 2017. Available from: http://www.msal.gob.ar/index.php/component/content/article/46-ministerio/184-calendario-nacional-de-vacunacion-2016 [Accessed on Feb 22th, 2017].
  • Tafuri S, Martinelli D, Prato R, et al. Vaccine effectiveness evaluation during a varicella outbreak among children of primary schools and day-care centers in a region which adopted UMV. Hum Vaccin Immunother. 2013;9:184–188.
  • Lai CC, Chen SC, Jiang DD. An outbreak of varicella among schoolchildren in Taipei. BMC Public Health. 2011;11:226.
  • Vazquez M, LaRussa PS, Gershon AA, et al. The effectiveness of the varicella vaccine in clinical practice. N Engl J Med. 2001;344:955–960.
  • Perella D, Wang C, Civen R, et al. Varicella vaccine effectiveness in preventing community transmission in the 2-dose era. Pediatrics. 2016;137:e20152802.
  • Hohle M, Siedler A, Bader HM, et al. Assessment of varicella vaccine effectiveness in Germany: a time-series approach. Epidemiol Infect. 2011;139:1710–1719.
  • Trucchi C, Gabutti G, Rota MC, et al. Burden of varicella in Italy, 2001-2010: analysis of data from multiple sources and assessment of universal vaccination impact in three pilot regions. J Med Microbiol. 2015;64:1387–1394.
  • Lopez AS, Zhang J, Marin M. Epidemiology of varicella during the 2-dose varicella vaccination program - United States, 2005-2014. MMWR Morb Mortal Wkly Rep. 2016;65:902–905.
  • Streng A, Grote V, Rack-Hoch A, et al. Decline of neurologic varicella complications in children during the first 7 years after introduction of universal varicella vaccination in Germany, 2005-2011. Pediatr Infect Dis J. 2017;36:79–86.
  • Elbaz M, Paret G, Yohai AB, et al. Immunisation led to a major reduction in paediatric patients hospitalised because of the varicella infection in Israel. Acta Paediatr. 2016;105:e161–6.
  • Humes EA, Weinberger DM, Kudish KS, et al. Trends in hospitalizations with primary varicella and herpes zoster during the prevaricella and initial postvaricella and herpes zoster vaccine eras, connecticut, 1994-2012. Open Forum Infect Dis. 2015;2:ofv001.
  • Marra F, Chong M, Najafzadeh M. Increasing incidence associated with herpes zoster infection in British Columbia, Canada. BMC Infect Dis. 2016;16:589.