mRNA vaccine

Second Covid-19 booster shot

eAwaz Medicine

LA – The US Centers for Disease Control and Prevention (CDC) has carried out a study that shows effectiveness of fourth dose of Covid-19 vaccines. It found that a second booster shot of an mRNA vaccine was effective against severe illness with some Omicron variants after observing over 200,000 emergency department visits and 58,000 hospitalizations with Covid-19 against the variants Omicron BA.1 and BA.2/BA.2.12.1. After the first booster shot, vaccine effectiveness against severe illness with Omicron variants BA.1 and BA.2/BA.2.12.1 was found to be just 68 per cent but increased efficacy with the second dose.