Why is saliva collection better than nasal swabbing for testing and collecting?

Why is saliva collection better than nasal swabbing for testing and collecting?

For a nasal swab, proper sample collection technique is needed to collect a small amount of mucosal material from a specific nasal region, making it error prone. In addition, the process is invasive, and many patients find the process either difficult or uncomfortable.

 By comparison, no skill is needed for saliva collection. The patient simply drools saliva into a tube; the sample collection process is neither invasive nor uncomfortable. Because the sample collection is not from a specific region and the sample size is larger than collected by nasal swab chances of human error are minimal.