When airborne, infective virus can drift through the air as an aerosol. In this form of transmission, “very small droplets that come out of our mouth very quickly evaporate the water off, and we’re left with a gel kind of material...that forms a bit of a protective environment for those virions to survive for longer,” Mackay explains. This is distinct from droplet-based spread of the virus. (The Scientist)

If you get enough virions on your hands and then touch your mucous membranes, including your mouth, nose and eyes, you could get infected. (The Globe and Mail)

Instead, the article suggests the cold makes us more susceptible to the virions and could activate dormant ones that are already inside us. It’s not just Covid-19, viral acute respiratory tract infections (vARIs) are also a major problem for microbiology. (WBUR)