With avian flu a going public health threat, President Trump's war on immigrants will complicate efforts to identify outbreaks and roll out vaccinations.
As Covid-19 hospitalization rates surge in the U.S., public health experts are advising a shift from thinking of the crisis as a pandemic to an endemic.
The CDC issued its revised guidelines Dec. 27, recommending that people who have tested positive for Covid isolate for five days, down from the previous 10-day requirement.
