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BA.4 and BA.5 are sub-variants of the highly transmissible Omicron strain of the coronavirus which had triggered the third wave of the pandemic in the country.
The health department said a report of civic-run Kasturba Hospital’s laboratory confirmed the presence of BA.4 sub-lineage in three patients and BA.5 sub-variant in one patient in the metropolis.
Out of the four patients, two were girls aged 11 and two men in the 40 to 60 age group, it said.
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