The two mutations BA.4 and BA.5, which appeared in South Africa, would not only be even more contagious than the previous ones, but a change in symptomatology would also be observed. The most frequent one includes a runny nose, tiredness, but also pains in the stomach and abdomen, in the ear, dizziness. “They attack the lungs less and the upper respiratory tract more,” said the virologist Pregliasco
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