Preparing for outbreaks of vaccine preventable diseases: why are prisons invisible?

Abstract From 1 March 2023 to 29 February 2024, 30 EU/EEA Member States reported a total of 5 770 cases of measles, 4 864 (84.3%) of which were laboratory-confirmed. Th7e highest number of cases were reported by Romania- at the time of writing, 11,397 confirmed cases, including 12 deaths from 1 January 2023 to 7 April 2024. Measles is a highly infectious disease. The best mitigation is vaccination which is highly effective. Outbreaks in many countries have been driven by decreases in vaccine coverage with a two-dose measles-containing vaccine (MCV), especially evident since the COVID-19 pandemic. In many countries, vulnerable migrant populations, ethnic groups and communities experiencing social deprivation have been over-represented in cases and under-covered by vaccine programmes. We know that prisons contain such populations. Historic seroprevalence studies of prison populations, which themselves are scant, show that prison populations are under-vaccinated. Prisons are a setting that can cause disease amplification. Given these facts, it is perhaps surprising that many countries in Europe cannot provide specific surveillance data on either cases in prisons or vaccine coverage specifically in prison populations. Further, that prisons are not often cited as specific settings for vaccine catch-up programmes in national or regional programmes. This is despite evidence of measles cases and outbreaks historically and currently in several European countries. In the presentation we will ask why this ‘blind spot’ in national and international disease surveillance continues and what Member States could and should do to prevent the risk of mass outbreaks of measles in prisons, causing pressures on justice and health systems and risking wider community outbreaks. Finally, we will reflect on how this experience should alert us to the risk of other infectious diseases going undetected, unprevented, and under-studies in prisons, threatening our collective health security.