The flu outbreak at Joint Base San Antonio Lackland Air Force Base has risen to 275 cases.
More than 60% of voters in right-leaning states support school vaccine mandates.
Infections have been identified in New York, Maryland, and Virginia, with a death in Maryland.
In the US, the FDA is investigating two new foodborne illness outbreaks caused by Listeria and Cyclospora.
Trial aims to study the safety and immunogenicity of the vaccine in healthy adults aged 18 to 64 years or 65 and older.
Pregnant women, young children, and the elderly are especially susceptible to severe Listeria infections.
Infections linked to packaged salads from 2 different firms caused 30 illnesses.
Seven new illnesses and 2 additional deaths have been confirmed in the outbreak, which has grown to 27 cases and 6 deaths.
Twenty people in 15 states have been now sickened in the outbreak, and 4 have died.
The CDC's FoodNet program has reduced required surveillance from 8 foodborne pathogens to 2, a move some experts warn could leave the country more vulnerable to outbreaks.
