Low vaccination rates and ‘measles parties’ fueled 2019 measles outbreak in NYC

An analysis of the 2018-2019 measles outbreak in New York City identifies factors that made the outbreak so severe: delayed vaccination of young children combined with increased contact among this age group, likely through “measles parties” designed to purposely infect children. The study has implications for the future, as vaccination rates plummet during the COVID-19 pandemic.