Some have become global mainstays and others are staying local: here is an overview of more than 20 approved Covid-19 vaccines currently in use, and a few that fell by the wayside. MRNA LEADS THE PACK:Messenger RNA (mRNA) vaccines developed by US-German alliance Pfizer-BioNTech and American company Moderna have emerged as the most successful vaccines in use today. LOCAL HEROS:There are a number of vaccines distributed only or mostly within the country where they were developed, though a few have limited international reach. German mRNA jab CureVac is also under review, though efficacy tests showed disappointing results at the end of June. Merck laboratories abandoned efforts to produce a jab in January, saying its candidates produced immune responses that were “inferior” to successful Covid-19 vaccines.

Source: Pakistan Today September 30, 2021 14:37 UTC