Someone I know has a cold. Let's call them perks. A. At the same time person B gets a cold and then tests positive for covid. Person A lives with person C. Person C also comes down with symptoms and tests positive for covid. Person A also tested for covid, but is not positive. Person A and B were ' infected ' at the same time. Person C only sees person A about 1 week to 10 days after symptoms started for person A. Person A tests 3 times during symptoms and is negative. Weird or what !