By a Staff Reporter: Booster doses are being given in many countries of the world to prevent the new variant of Corona. But how long is the effectiveness of that booster dose? According to the U.S. Centers of Disease Control and Prevention, the efficacy of the third dose of Pfizer and Moderna's mRNA vaccines is starting to decline within four months.
/anm-english/media/post_banners/rmaaiEoCMjKN5OQ48kfK.jpg)
/anm-english/media/agency_attachments/AtBG5e3MoE629QYzhZen.png)