Maria20,
I don't blame you for feeling guilty. Having your windows open and then your neighbor dying would make you wonder. However, Sue is right. Colds are caught through close contact and sneezing etc. My husband and I washed our hands a lot; especially after going to the dumpster. We also stayed away from crowded areas whenever possible. For instance, we went shopping early in the morning when there are less people. We kept our house clean. We also never got a flu shot. We didn't get a cold for over 15 years. My husband died of lung cancer last July but I still follow our guidelines and I haven't gotten a cold at all.
PML