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Coronavirus infection is most difficult to detect on the fourth or fifth day of illness. The likelihood of detecting coronavirus on testing decreases on the fourth or fifth day of illness, which is why sometimes the patient has all the symptoms of COVID-19, but the test shows a negative result, said Professor Natalia Pshenichnaya, deputy director of clinical and analytical work at Central Research Institute of Epidemiology at the Federal Health Supervision Service.
“After the fourth or fifth day of illness, the likelihood of detecting a virus in the nasopharynx decreases, and respiratory symptoms may be in full swing at that time. If testing is done during these days, you may get a negative result,” she said.
Earlier, Pshenichnaya said that the coronavirus has no specific symptoms specific to it, so it is impossible to make an accurate diagnosis without laboratory tests.
She explained that if there are respiratory symptoms such as cough, runny nose, fever, then the patient may suspect that he has a coronavirus, especially if he was in contact with an infected person a few days ago. However, in order to make a diagnosis, a laboratory test is needed, as it can be both influenza and SARS, the expert specified, BGNES reported.
Tatiana Ruzhentsova, MD, said earlier that patients with coronavirus who had been vaccinated before could shed the virus, but the amount of pathogen and the time to isolate were much smaller than those not vaccinated, so the risk of infection than vaccinated is many times smaller.
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