Advice includes optimizing HVAC systems and other steps to improve air quality and circulation.
Flu indicators declined last week, as COVID wastewater detections declined to the low level.
Pakistan also reported several WPV detections in environmental samples from five locations.
Some states in the Central and Midwest regions are reporting high or very high flu activity.
A total of 7% of infants in the vaccine group were born early, compared with 5% in the placebo group, a 37% difference.
Wastewater COVID detections last week declined from the high to the moderate level.
If infants aren't protected from RSV through maternal vaccination, they should receive the long-acting monoclonal antibody, the authors say.
Flu is rising in central states, and COVID levels are highest but on the decline in southern states.
Researchers saw sustained efficacy against both severe and less severe symptoms.
Flu activity increased in five regions: the Northeast, New England, the Middle Atlantic, the Midwest, and the Central states.