Covid is as catchy as measles. That means it's probably not just airborn but exceptionally so. It's in the air outside. It's in air in ventilation systems. It's

Covid is as catchy as measles. That means it's probably not just airborn but exceptionally so. It's in the air outside. It's in air in ventilation systems. It's in the sewers. There are cases where outbreaks have happened within buildings when the virus came up through the toilets, spreading from flat to flat despite complete lockdown. It's very likely that you have caught it already despite the precautions.