With RSV still spreading, most states extend vaccine period

(CNN) - With RSV lingering later into spring this year, most states are extending the window for RSV immunizations for infants and toddlers.

Shots for infants and toddlers will now be available through the end of April, as RSV continues to spread. The common respiratory virus typically causes a mild illness, like a cold, but it can cause serious illness for young children.

RSV typically follows a fall-to-spring pattern with immunizations recommended through the end of March – but this season has shifted. Federal data shows positivity rates are significantly higher than this time last year.

As a result, most states have extended their RSV season through the end of the month. The extension means providers can keep offering immunizations for a longer period, something experts say is critical as RSV is the leading cause of infant hospitalization.

While it’s unclear why the virus is sticking around, doctors say continued access to immunization could make a real difference.