I thought this was an interesting post from virological.org - re the “warm weather/will it be a seasonal virus?” issue:
Secondary spread in the tropics or Southern Hemisphere is NOT evident to date. Whether or not this occurs, either in Brazil, Nigeria, or anywhere else a patient with the virus has landed, will give us a good indication whether or not COVID-19 will thrive when warmer weather comes to the Northern Hemisphere.
We also need to be aware that respiratory agents that lose their foothold in warmer and moist climate may seed throughout the area invisibly and silently, only to erupt everywhere when temperatures later drop. This was the pattern with the H2 flu in 1957. It arrived in California in May-June, then virtually disappeared, only to erupt with a volcano of cases on October and November of 1957. California, then 14 million in population, was estimated to have 1.2 million cases of flu in one week in November, an attack rate of 8% in one week (California Health Survey 1957-58).
We need to caution about declaring victory too soon, even if this proves to be seasonal, and letting down our guard. COVID-19 is already too widespread globally for that.
William R. Gallaher, Ph.D.
Professor of Microbiology, Immunology and Parasitology, Emeritus
LSU School of Medicine, New Orleans