Since 2017, large outbreaks of hepatitis A among adults have been occurring in a number of US cities and states, resulting in increased demand for vaccine. Initially, supplies of adult hepatitis A vaccine in the US were constrained. In response, CDC took a number of steps to mitigate the supply issues. Specifically, CDC (1) worked directly with public health officials in affected jurisdictions to provide guidance about targeting vaccine in response to local epidemiology; (2) collaborated with manufacturers to understand options for managing supplies in the private sector and increasing national supply; (3) implemented ordering controls in the public sector; and (4) increased vaccine availability on CDC’s adult vaccine contracts.
Nevertheless a shortage has formed in 2020-2021
Association between COVID-19 outcomes and mask mandates, adherence, and attitudes
Using an event study design, authors estimate the treatment effect of the introduction of mask mandates (shown on the vertical red line) on Z-scored population-normalized COVID-19 daily new confirmed cases, daily new hospitalization admissions proportion, and deaths across all 50 states and D.C. over the time period between February 1 and September 27, 2020.
Source: Dhaval Adjodah, Karthik Dinakar, Matteo Chinazzi, Samuel P. Fraiberger, Alex Pentland, Samantha Bates, Kyle Staller, Alex Vespignani, Deepak L. Bhatt. Association between COVID-19 Outcomes and Mask Mandates, Adherence, and Attitudes.