Seven months into the country's COVID-19 vaccination drive, 22 million or over 20 percent of the population have been fully inoculated, while 25 million are waiting for their second dose. <br /><br />Some experts now raise the need for booster shots as studies on waning efficacy surface including Pfizer's vaccine, which makes up 19 percent of the country's supply.<br /><br />Carolyn Bonquin has that story. www.cnn.ph
