New York City is seeing some of the highest levels in the country.
As cases of respiratory illnesses rise, some epidemiologists are encouraging people to take safety precautions.
Main Line Health has announced a temporary return to masking at all of its locations because of what it says is a significant increase in COVID-19, flu and RSV cases.
According to the Centers for Disease Control and Prevention, as of December 29, flu activity is minimal in Delaware, high in Pennsylvania, and very high in New Jersey.
The CDC reports that 23 states, including New Jersey, are currently seeing high or very high levels of respiratory illness activity.
When it comes to holiday travel, there's a question many are mulling over -- should you still wear face masks?