The Omicron BA.5 subvariant of Covid-19 is currently believed to be the dominant one. The subvariant could be more likely to result in reinfection of a person irrespective of whether they are vaccinated, as per a new study from Portugal.
The study carried out between late April and early June on over 27,000 people infected with either BA.2 or BA.5 subvariants, found 4.4% higher reinfections in BA.5 cases.
This suggests diminishing protection from earlier infection in the case of BA.5 subvariant. Furthermore, they also found the vaccines to have lesser effectiveness in curbing the risk of a BA.5 severe disease compared to BA.2 subvariant.
"Among those infected with BA.5, booster vaccination was associated with 77% and 88% reduction in risk of COVID-19 hospitalization and death, respectively, while higher risk reduction was found for BA.2 cases, with 93% and 94%, respectively," Reuters cited the researchers.
While "COVID-19 booster vaccination still offers substantial protection against severe outcomes following BA.5 infection," the researchers said the observation will give "evidence to adjust public health measures during the BA.5 surge."
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