People over 50 years old and those with weak immune systems may now get a second booster shot for COVID-19. <br /><br />Both the U.S. Centers for Disease Control and Food and Drug Administration approved the expansion of the emergency use authorization for a fourth dose. A second booster can be given four months after the first one for Pfizer and Moderna vaccines.<br /><br />Let's find out why global experts are recommending a fourth shot from former U.S. FDA associate commissioner Peter Pitts.<br /><br /><br />Visit our website for more #NewsYouCanTrust: https://www.cnnphilippines.com/<br /><br />Follow our social media pages:<br /><br />• Facebook: https://www.facebook.com/CNNPhilippines<br />• Instagram: https://www.instagram.com/cnnphilippines/<br />• Twitter: https://twitter.com/cnnphilippines
