Roger Federer suffered defeat for the second day in succession as United States completed a surprisingly comfortable victory over Switzerland in the Davis Cup World Group first round in Fribourg on Saturday.
'However, the importance of children in transmitting the virus remains uncertain,' the scientists cautioned in the study. 'Coronaviruses are a large family of viruses that can cause infection and disease in animals, capable of rapid mutation and recombination, leading to novel viruses that can spread from animals to humans,' they said.
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