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So are his grandparents going to catch a cold from the trees? If they don't have contact due to blocked roads then I think they can rule out viral infections?

Or have I forgotten something.




Can't rule it out. You don't have to be showing symptoms to be a carrier, and you can be a carrier for extended periods. It's quite possible (in fact likely) that there are plenty of virus sources waiting to get you, including inside yourself.




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