People above the age of 50 in Bahrain who are more vulnerable are now being asked to get a booster shot of the Pfizer-BioNTech vaccine, almost six months after completing the vaccination with Sinopharm jabs. While battling a sharp surge in Covid-19 cases, Bahrain, which began vaccination drive with a made-in-China vaccine, has started to give booster shots to vulnerable individuals using a different vaccine made by American company Pfizer and its German partner BioNTech.