RIO DE JANEIRO, BRAZIL - The word 'cold' is misleading. It refers to the temperature, yet it is viruses (or bacteria) that cause infections, not the degrees marked on thermometers. Temperature can help, but it is not decisive for the spread of respiratory diseases; at least not directly. The key is that in winter we stay indoors longer.
Poorly ventilated rooms are the perfect breeding ground for colds and infections to concentrate and spread. This is also true for Covid-19, which has the outdoors as one of its main enemies, as evidenced by the findings on the SARS-CoV-2 . . .