Tuna sold in 26 states and in Washington, D.C., was recalled over concerns that it may have been contaminated. The stores affected include Trader Joe’s, Genova, Van Camp’s and H-E-B.

A new version of the virus is widespread in wild birds but had not previously been detected in cows.

The cases have spurred new pet food safety rules and poultry surveillance efforts.

Levels of PFAS in sewage sludge used as fertilizer can pose risks that sometimes exceed safety thresholds “by several orders of magnitude,” the agency said.

Consumer and food safety groups have long urged the agency to revoke the use of this dye and others. The F.D.A. says there still is no evidence it is a human carcinogenic.

Wastewater, even after treatment to make it drinkable, contains high levels of PFAS, according to researchers.

While some agree with Robert F. Kennedy Jr. that the agency needs reform, their ideas for fixing it are very different from his.