Do you mean like a sneeze that sneaks up on you?Everybody's covid positive has been different, some things the same or similar. I really didn't get any cold like symptoms except the one day, think it was maybe third day I knew I had it was sneezing all day and not like a cold sneeze more like a going outside seeing the sun type sneeze if anyone else ever has that happen. Just a bang sneeze no reason no tickle warning no nasal congestion or anything. All day long.