Although there are negative results for SARS-CoV-2, the mother and the Russian in Vung Tau still have to concentrate and test again.
On January 12, the Department of Health of Ba Ria – Vung Tau province said that this is the latest test results of patients 1333 and 1334 after 2 days of re-positive for SARS-CoV-2. These are two Russian mothers and children who came to Vietnam from November 2020 to visit their husband who is working in Vietnam.
Before that, they were determined to have Covid-19 after their entry and were treated at the Medical Center of Cam Lam district (Khanh Hoa) from November 27. On December 25, these two people were discharged from the hospital. After arriving at Tan Son Nhat airport, samples tested at a hospital in Ho Chi Minh City showed that these 2 people were re-positive for SARS-CoV-2.
The husband of patient 1333 and 2 medical staff from Vietsovpetro Medical Center who had close contact with him also tested negative for SARS-CoV-2. The Department of Health of the province is currently tracing 6 people exposed to the cases and concentrated in isolation.
Patients will continue to be tested 2 more times to confirm the results. Therefore, at this time, the Department of Health continues to take necessary measures to prevent and control the epidemic according to regulations. These two people are being isolated, monitoring the Long Dien District Medical Center.
According to the master, doctor Nguyen Trung Cap, professional deputy director of the Central Hospital for Tropical Diseases (Hanoi), patients with Covid-19 in the early stages or in recovery will have the concentration of the virus in the mid-negative boundary. and positive. In addition, the result depends on the concentration of the virus in the sample.
Because the test can only identify the RNA (a piece of the structure) of the virus, in some cases, SARS-CoV-2 dies, but some fragments remain in the tissue. At this time, the patient put into the test still gives positive results. These cases are called viral re-positive.
According to Dr. Le Quoc Hung, Head of the Department of Tropical Diseases, Cho Ray Hospital, Ho Chi Minh City, many theories are put forward to explain the phenomenon of re-positive, including: test error, recurrence or recurrence. infection and the theory of “corpse” virus. However, up to now, in practice the vast majority of recurrence cases are those who have no recurrence of symptoms and also do not infect those in close contact.
“Hypotheses are just hypotheses, in order to know exactly about the nature of the re-positive problem, scientists need to conduct more in-depth studies to understand the nature of SARS-CoV-2 – the strain virus. new.
In the short term, we still have to isolate the re-positive, sample for RT-PCR test every day. In addition, neutralization antibody tests are also carried out in parallel to determine the antibody’s ability to destroy or inactivate the virus, ”said Dr. Hung.