HHS.gov @HHSGov
A4: Some vaccines, like whooping cough, are effective at preventing disease but their protection can decline each year. Booster shots can help your immunity remain strong ➡️ https://t.co/8afDVDfTHw. #HHSVaxChat — PolitiTweet.org
Natl Vaccine Program @HHSvaccines
Q4: How effective are vaccines? #HHSVaxChat https://t.co/MG80aUlvkv