Just musing. I know lots of small kids who have had fairly typical COVID symptoms, were a close contact of a positive case, and had just a nasal swab as they wouldn't cooperate with the throat swab, and all came back negative.
In one case, mum, dad, and older siblings all had throat swab and was positive, 4yr old had nasal swab and was negative.
Could it just be that a nasal swab is less accurate at picking up the virus? The stats all show that young kids test positive at a much lower rate than older kids, and I wondered if the testing method had anything to do with this.