कोविड-19 का पता लगाने के लिए नाक का स्वाब मौखिक स्वाब से बेहतर क्यों है?? What is the difference between nasal cavity swab and oral swab? According to Deputy Chief Physician Cai Yuexin, some areas of the pharynx include nasopharynx, मुख-ग्रसनी, and laryngopharyngeal. The mucous membranes of the three are continuous and belong to the area of ?the upper respiratory tract. Nasal swabs and …