Biopharmaceutical company Pfizer announced on Wednesday (Jul 28) that a third shot of its Covid-19 vaccine could improve immunity against the virus. However, two doses offer “lasting and robust protection” against serious diseases. The new data released by Pfizer shows that levels of antibodies that can target the more transmissible Delta variant increases up to … Continue reading Citing the Delta variant, Pfizer pursues booster shots, but scientists are debating about it