The map of flu activity across the United States continues to darken, both figuratively and literally, as case numbers spike upward in most states, according to the Centers for Disease Control and Prevention (CDC).

There have been at least 24 million illnesses, 310,000 hospitalizations and 13,000 deaths from flu so far this season, according to the CDC. The agency said in its weekly flu surveillance report that seasonal influenza activity continues to increase across the country.

The United States is seeing a second peak in flu cases this season. After doctor’s office visits for flu dipped early this year, they jumped past the previous season peak at the end of last month, with a 30% test positivity rate — and there are still months to go.

Testing results from patients indicate that two strains of seasonal flu that are causing most illnesses — a Type A H1N1 and a Type A H3N2. Health officials are closely watching

For a second time this season, at least 41 states are reporting high or very high levels of the flu. Here's how to stay safe.

Multiple cases of bird flu in chickens are forcing the closure of live poultry markets in parts of New York state, Gov. Kathy Hochul, D-N.Y., announced Friday.

The order affects roughly 80 markets in New York City and in several nearby counties. New Jersey is also asking its live markets to voluntarily clean, disinfect and temporarily close.

The order also temporarily shuts down all bird markets in Westchester, Nassau and Suffolk counties after 7 cases were detected in NYC poultry.