The main reason for collecting nasal swabs and throat swabs is that the sampling place is different. Nasal swabs are collected deep in the nasal cavity, and throat swabs are collected deep in the throat.
Most of the nucleic acid tests are done with a throat swab. The cotton swab can be used to go deep into the throat for collection. If you choose the nasal swab collection method, because there is a nasal septum inside the nose, So collection is more difficult.
In general hospitals, most of them choose throat swabs for testing
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