For patients with weakened immune systems, effectiveness was lower, at 67% for patients aged 60 to 74 years to 73% for those older than 75.
The 10 new flu-related deaths in children bring the season's total to 226, the most since 2009-10.
Hospitalizations of infants for respiratory syncytial virus (RSV), human metapneumovirus, and adenovirus fell dramatically.
The pediatric deaths push the season total to 216, surpassing last season's total of 207.
Flu-related deaths in children climb to 204, up 6 from the previous week, the CDC says.
The highest risk of transmission of SARS-CoV-2 was in the first 72 hours at room temperature and first 24 hours at 37℃.
Overall, efficacy against respiratory syncytial virus infections was highest during season one.
One state, however—New York—reports high activity of influenza-like illness.
Both the CDC and NIH face cuts of more than 40%, according to an internal Trump administration document.
The group recommended RSV vaccination for more at-risk adults and took into account a safety consideration for seniors for the first-approved chikungunya vaccine.
