john chandler from our nbc new york station has more. >> reporter: feeling under the weather this spring? the cdc says hmpv might be the reason. >> oh, really? wow. i didn't know that. >> reporter: most were unaware of this respiratory virus, which can feel like a bad case of the common cold, my mom last week had a really bad sore throat, and new my nieces are getting sick. >> reporter: and hmpv is going around at its peak in mid-march, the cd saw positive testing 36% higher than precovid viruses. >> the virus doesn't cause severe infections. we don't test it everywhere for every patient. >> reporter: dr. marina keller treats infectious diseases at whes chester medical center. she says hmpv are similar to other virus, runny noses, sore throat, fever, cough, nasal congestion and shortness of breath. >> it's like other respiratory viruses like what we call the common cold. but it can be more worrisome for people who have medical problems. >> reporter: those with weaker immune systems are more at risk, younger children and the elderly especially and as the urgency of covid fades, so too mig