Recently, a medical research team published an article in an international journal. The article found that patients with New Coronary Pneumonia have higher viral loads in their upper respiratory tracts early in the course of the disease, and that viral loads begin to decrease over time, according to the article. Patients with New Coronary Pneumonia cases can detect higher viral loads soon after the onset of symptoms and have higher viral loads in their noses than in their throats.
Xia Xin of the microscopy section of the Hunan Provincial CDC said that the current screening specimens for nucleic acid testing in mildly ill patients as well as suspected cases are mostly deep cough sputum or oropharyngeal swabs and nasopharyngeal swabs. To further improve the positive rate of nucleic acid testing, a simple graphic demonstration of nasopharyngeal swab collection methods and precautions is used.
Sampler in secondary protective equipment
What is the key to collecting specimens for nucleic acid testing?
Whether collecting nasopharyngeal swabs or oropharyngeal swabs, the depth of collection is critical. If the nasopharyngeal swabs are not collected deep into the nasal cavity, the majority of cells collected may be non-viral, which may result in a "false negative".
What is the difference between the anatomical structures of the nasopharynx and oropharynx?
Anatomical structure: The nasal cavity, oral cavity and larynx are divided into the nasopharynx, oropharynx and upper, middle and lower laryngopharynx, with the nasopharynx being more superior.
Oropharyngeal swab
Oral swab sampling method: 1 prepare water before sampling rinse mouth after no longer drinking water waiting for sampling 2 oral cell sampling.
a tear open the outer packaging of the swab (at this time, take care not to touch the swab head)
b, hold the handle, the swab head fully touch the inner part of the cheek, with the strength of brushing teeth up and down 10-15 times, the same method on the other side up and down 10-15 times, 3 after sampling, the swab into the swab tube, mark
Oral swab precautions.
1 No more water after rinsing the mouth and waiting for sampling
2 Swab tube Take care to mark name, age, date of sampling
Nasopharyngeal swabs and oropharyngeal swabs collect tissue cells that are anatomically located differently.
What is the correct procedure for collecting a nasopharyngeal swab?
1. The sampler holds the swab (a plastic rod swab with a polypropylene fiber head) with the right hand and holds it in place by pressing the top of the subject's head with the left hand.
2. The swab with the tip curved slightly downward enters from the anterior nostril and slowly penetrates backward along the bottom of the inferior nasal canal ｛because the nasal canal is curved, the action should be gentle and slow, do not use excessive force to avoid trauma and bleeding.}
3. When the tip of the swab reaches the posterior wall of the nasopharynx (touching the wall), leave the swab for a moment (about 3 seconds), then gently rotate it for a week and slowly remove the swab.
4. Another plastic rod swab with polypropylene fiber head can be taken to collect the other nostril in the same way, and the above two swabs are dipped into the same tube containing 3 ml of virus sampling solution, the tail is discarded and the cap is screwed on tightly.
5. Packed according to biosafety requirements, it should be transported to the laboratory of the CDC at all levels for virus nucleic acid testing as soon as possible.
