When something has an r similar to measles, ie naturally spreads to 12-18 people, it's probably not just people you are in contact with who can catch it from yo

When something has an r similar to measles, ie naturally spreads to 12-18 people, it's probably not just people you are in contact with who can catch it from you. Perhaps particles sit in the air and float really far, or door handles, that kind of thing that might mean eliminating contacts doesn't even help. Basically you won't even know why infected you when rates are that high.