Improving ventilation is one way to curb the spread of respiratory viruses like COVID-19, the U.S. Centers for Disease Control and Prevention (CDC) says in new guidance.

“By using core strategies, like vaccination and practicing good hygiene, we can protect ourselves and those we care about from respiratory illness. Improving ventilation is another one of the core strategies that can reduce our risk of catching or spreading respiratory viruses,” the CDC’s National Center for Immunization and Respiratory Diseases said in a recent update.

COVID-19 vaccines and influenza vaccines both have subpar effectiveness against infection and neither prevent transmission, the agency did not note.

“Good ventilation can help safeguard our health by reducing our exposure to respiratory viruses. People can still get sick after ventilating a space, so it is important to use ventilation as one part of a multi-layered approach to protect ourselves against getting sick from respiratory viruses,” the CDC added. “It’s important to take steps to improve ventilation in our homes and other indoor spaces as a core prevention strategy year round, from cold winters to hot summers.”

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