F1 COVID-19 8 times tested negative, only positive for 9 times, why?

After 8 tests were negative for SARS-CoV-2, on May 27, the patient was sampled by Thai Binh Lung Hospital and tested using GeneXpert technique. The patient's specimen results were positive for SARS-CoV-2.

Previously, the Ministry of Health issued a notice that recorded 1 case of COVID-19 in Thai Binh province with code 6319. This case was born in 1968 (male), lived in Nam Trung commune (Tien Hai district). , is that F1 has been isolated at the isolation area of Thai Binh Lung Hospital, so there is no risk of spreading to the community. Notably, before contracting COVID-19, this patient was sampled 8 times and all results were negative for SARS-CoV-2.

According to Thai Binh province's health sector, the newly announced patient is the son of patient 3537 who was confirmed to have COVID-19 on May 11, 2021. Before that, the man mentioned above went to take care of his father (patient 3537) and was treated in room H910, Department of Internal Medicine and Gerontology - Provincial General Hospital. After the cases in the same treatment room with patient 3537 tested positive, the patient's father and son were transferred to isolation at Thai Binh Lung Hospital.

After 8 tests were negative for SARS-CoV-2, on May 27, the patient was sampled by Thai Binh Lung Hospital and tested using GeneXpert technique. The patient's specimen results were positive for SARS-CoV-2.

Immediately after, the patient's specimen was transferred to Thai Binh CDC for confirmatory testing. At Thai Binh CDC, this patient's test result confirmed positive for SARS-CoV-2.

Currently, the patient has been transferred to Thai Binh Provincial General Hospital for isolation and treatment.

According to Associate Professor Tran Dac Phu - former Director of the Department of Preventive Medicine, Real-Time PCR test is a test to confirm whether a person is infected with Covid-19 or not. high sensitivity and specificity.

The results of the test depend on many factors. The first is on the course of the disease, ie at what stage of the disease the specimen is taken. For example, if the time of sampling was when the virus was first contracted, the PCR test would still be negative.

If the patient is infected with Covid-19 but the virus has not multiplied enough to give a positive result, it will take a while to test positive.

In addition, there is also the possibility that the patient is infected in the isolation ward. This is just a theory, but it's entirely possible.

Before that, we also recorded many cases of Covid-19 after many negative times before being positive.

Until now, Associate Professor Phu still confirmed that the SARS-CoV-2 virus still has an incubation period of 14 days, very few cases have an incubation period of up to 21 days. However, people still cannot ignore the disease. Even if F1 is negative, they still need to comply with the isolation regulations.

To avoid infection in the community, people need to strictly follow 5K and disease prevention measures as recommended by the Ministry of Health.

On the morning of May 29, the Center for Disease Control of Ho Chi Minh City said that it has recorded 6 new positive cases, all of which are F1 who have been isolated for testing.

Thus, in the past 3 days, the city has detected 2 outbreaks, a total of 68 cases in 12 districts. In which, the district infection chain related to the Renaissance Mission Church is the largest chain with 63 cases, the chain of infection related to the case detected at Hoan My Hospital has 5 cases.

The city continues to conduct contact tracing investigations, taking large-scale testing samples to assess the risk. Measures to cut off the source of infection as well as investigate the source of these infection chains are continuing to be implemented.

Assessing the situation of the city at risk of pathogens already in the community, people need to raise their vigilance but not panic. Comply with the government's epidemic prevention measures and cooperate with the health sector in implementing blockade, isolation, and sampling.

Be honest in medical declarations about your own risk and exposure factors. When there are signs of fever, cough, difficulty breathing, loss of taste, smell... go to a doctor immediately and declare truthfully when going to a medical facility.

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