TORONTO (CTV Network) -- A study looking at the effectiveness of fourth doses of COVID-19 vaccines, run by the U.S. Centers for Disease Control and Prevention (CDC), has found that a second booster shot of an mRNA vaccine has significant effectiveness against severe illness with some Omicron variants.

The study looked at more than 200,000 emergency department visits and 58,000 hospitalizations with COVID-19 to assess effectiveness against the variants Omicron BA.1 and BA.2/BA.2.12.1. The newer strains of BA.4 and BA.5, which are thought to be driving the current wave of COVID-19 cases in Canada and other regions, were not part of the study.

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