South Korean scientists have come to the conclusion that repeated tests may give a positive result even after full recovery of the patient due in the presence of his body “neutralized fragments of the virus”, are not able to infection.
If you recheck recover from Covid-19 patients for the presence of virus in the body tests sometimes give a positive result — even after full recovery of the patient and the disappearance of the symptoms (if any).
Because knowledge about the new virus continue is very limited, scientists a few months could not understand how the re-test can give such results and the conclusions based on this needs to be done.
does this Mean that transferred the disease does not give immunity recovered and therefore get Covid-19 several times?
whether the person Can remain contagious even after a full recovery, and if so, how long it continues to present a danger to others?
the Exact answer to the first question continue no. We know that after the disease a person develops a specific immunity, but can only imagine how long recovered patients remain immune to the coronavirus.
Some diseases (like measles or chickenpox) give immunity to the end of life, others (hepatitis a, yellow fever and others) — about 10 years, and viruses like seasonal influenza specific immunity almost leave.
the second question seems to be answered by South Korean scientists: recovered patients are not contagious and pose no danger.
on Wednesday, the health experts of the country said that repeated tests may give a positive result even after full recovery of the patient due in the presence of his body neutralized fragments of the virus.
on Tuesday it was reported that in South Korea tests continue discover the virus nearly 300 people who recover from Covid-19 — the total number of recovered patients is approaching 9000.
the fact that most of the tests used to diagnose Covid-19 worldwide, uses polymerase chain reactions (PCR tests), the purpose of which is to increase the concentration of the virus’s genetic material, which makes it easier to detect in the capture sample.
In this case, according to scientists, the tests were very sensitive and was reacting not to the virus itself, and the remaining in the body of patients fragments of viral RNA by in the testing process.
“Fragments of RNA may be in the cell, even if the virus itself is harmless, — said in a statement, the South Korean Central clinical Committee for the control of emerging diseases. — Most likely, the repeated analysis showed the presence of RNA already neutralized the virus.”
However, experts stress that in this exploded view, the virus is able to infection, so danger to surrounding these people do not represent, as to reactivate the virus is almost impossible, unless Covid-19 does not cause chronic infection.
“unlike agents of other infections such as HIV or hepatitis b, the virus that causes Covid-19, does not penetrate into the cell nucleus and is not integrated into the DNA of the patient. So, chronic infection and it does not cause”, — assured reporters the head of the Committee On Myung Dong.
