Millions are affected by the flu each year. Here's how to protect yourself from the virus.
The child, from North Jersey, was under five years old and had no known health issues.
With multiple viruses circulating, doctors say it can be difficult to determine which illness someone has based on symptoms alone.
The CDC reports flu cases in Pennsylvania and Delaware are in the "high" category, while New Jersey is seeing "very high" numbers as the virus spreads nationwide.
Flu activity is continuing to climb across the U.S. as hospitalizations rise, updated data from the CDC shows.
According to the Centers for Disease Control and Prevention, flu activity is very high in New Jersey, moderate in Pennsylvania and minimal in Delaware.