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No, viruses operate fairly independently of one another. Flu circulates every winter, despite other respiratory viruses being common.Do you think no flu is because corona virus took over its niche?
Little to no international travel (and less domestic) = no shift in the viral pool around the world. This would also make our current flu vaccine much more likely to remain accurate, as we weren't at risk for a different strain being imported. Also, less gatherings/social interaction naturally means less spread of common viral illnesses.