RSV is usually contagious for three to eight days. A patient also may be contagious a day or two before experiencing symptoms, the CDC said. Infants and those with weakened immune systems, however, can pass on RSV for up to four weeks or longer.

Fact checked by Nick Blackmer Cases of respiratory syncytial virus (RSV) have peaked in many areas of the United States, according to data released last week by the Centers for Disease Control and Prevention (CDC).

— The flu, caused by influenza viruses that are always changing, leads to fever, chills, cough, sore throat, runny nose, body aches, headaches and feeling tired. Flu symptoms tend to hit more quickly than cold symptoms, and can last anywhere from a few days to two weeks.

Respiratory illnesses like RSV, COVID-19, flu, and the common cold spike annually. Johns Hopkins experts debunk myths and share prevention tips. While vaccines target RSV, COVID-19, and flu, managing the cold relies on hygiene and timeless remedies.

When broken down by state, most of the country is experiencing elevated respiratory illness, including a few states with “very high” ratings that act as national hotspots, CDC data shows.

The Health Department of Northwest Michigan is reporting an increase in respiratory illnesses across Antrim, Charlevoix, Emmet and Otsego counties this winter.

The Southern Nevada Health District is urging Clark County residents to take precautions against respiratory illnesses such as influenza and COVID-19.

Statewide data released Thursday by the Minnesota Department of Health indicates that hospitalizations for influenza and COVID-19 have slightly declined for the first time in over a month.