Journal of Infectious Diseases
Volume 210 Issue 13 September 15, 2014
http://jid.oxfordjournals.org/content/current

Emergency Settings: Be Prepared to Vaccinate Persons Aged 15 and Over Against Measles
Reinhard Kaiser
Advance Access 10.1093/infdis/jiu463
[Initial text]
In their landmark article on measles prevention in emergency settings, Toole and colleagues recommended in 1989 that all children aged 6 months to 5 years should be immunized with measles vaccine at the time they enter an organized camp or settlement [1]. In 2000, Salama and colleagues documented substantial mortality during a famine emergency in Ethiopia, with measles and malnutrition as major contributing factors. In a retrospective study of mortality, measles alone, or in combination with wasting, accounted for 35 (22.0%) of 159 deaths among children younger than 5 years and for 12 (16.7%) of 72 deaths among children aged 5–14 years. The setting was a rural population without routine childhood immunization and exposure to natural measles virus infection [2]. The authors concluded that measles vaccination, in combination with vitamin A distribution, should be implemented in all types of complex emergencies. Vaccination coverage should be 90% and extended to children up to age 12–15 years [2]. A vaccination age range up to 14 years was included in the World Health Organization (WHO)/United Nations Children’s Fund (UNICEF) statement to reduce measles mortality in emergencies [3], and the revised SPHERE project guidelines [4]. However, since then, the discussion about target age groups has increasingly included the potential need to vaccinate adults. As early as 2000–2001, Kamugisha and colleagues documented 21% of measles cases that were 16 years and older in a major outbreak in Tanzanian camps with refugees from Burundi [5]. The authors concluded that in some emergency settings, achieving population immunity adequate to prevent virus transmission may require vaccinating persons older than 15 years, and the selection of target age groups for vaccination should consider measles epidemiology in source and refugee populations [5]. A recent review documented additional measles outbreaks in emergencies that included adult cases [6], and the recommendation to review the measles epidemiology to inform decisions about vaccination target age groups has increasingly become standard in emergency [7, 8] and nonemergency settings [9]. This shift in recommendations has been a result of the changing epidemiology of measles in Africa [10].