Why don't we have cheap/free, widespread, rapid home testing yet? We've known about Covid-19 for almost a year!
Then people could just test themselves before traveling or going to indoor gatherings. They could also be used at airports, etc.
Then people could just test themselves before traveling or going to indoor gatherings. They could also be used at airports, etc.
If the tests give you a positive result, you almost certainly have Covid. However, a negative result doesn't imply lack of Covid with the same accuracy.