MANILA, Philippines — Some vaccines have shown a decrease in their efficacy against COVID-19 variants, but they are “still useful” in helping stem the spread of the severe respiratory illness, Director-General Eric Domingo of the Food and Drug Administration (FDA) said Monday during the taped weekly briefing with President Rodrigo Duterte.
Domingo cited studies on the efficacy of the US-made Pfizer vaccine and the British-Swede-made AstraZeneca that showed a slight decrease in their efficacy against the Alpha and Delta variants of COVID-19.
Data from Pfizer showed, however, indicate that its vaccine retained a high efficacy rate of 93 percent against the Alpha variant, which …
Keep on reading: Some vaccines ‘still useful’ despite dip in efficacy vs COVID-19 variants – FDA