MOSCOW, may 11 — RIA Novosti. Tests for the presence of coronavirus and antibodies can mislead and falsely show negative results on all stages of the disease CОVID-19, told RIA Novosti doctor of biology, Professor, School of systems biology, GMU (USA) Ancha Baranova.

In the first stage, as explained by the expert, even in the absence of symptoms, the virus multiplies, and media carries the infection.

“About 40% of people get the virus from asymptomatic carriers. After the first stage is the stage where symptoms are noticeable. However, some number of people the disease does not go beyond the first stage,” she said.

According to biologist, the first stage of suppression of the virus occurs through interferons, which create a natural protective system of the body. He can defeat infiltrator a virus, rather than antibodies, so the antibody have contracted the coronavirus can be negative.

the second phase symptoms: a fever and cough, then you may experience shortness of breath. In this stage the virus is still propagated, and it is appropriate to use antiviral drugs, which provides therapy CОVID-19. In addition, the body includes additional protection. Approximately in the middle of the second stage, he begins to develop antibodies.

“People can also stay in the second stage, and the disease does not go into a more acute form. At this stage the virus can be defeated by antibodies. In the worst case the disease is not complete, because the inflammation is still in progress, pneumonia is, but at the expense of other factors. This situation can lead to the fact that the test for the virus will give a negative result. The next stage, it is even more difficult. Again, at this stage, the virus can be in person, and can no longer be”, — said Baranov.

She said that in the third stage may occur the cytokine storm (the uncontrolled inflammation which leads to damage of body’s own tissues — ed.). Often at this stage, the person is transferred to hospital, there is a need to connect to the device of artificial ventilation of lungs (IVL).

“In the third stage, the virus replicates at a low level, and the most important factor of recovery becomes the resistance of the human body”, — concluded the Agency interlocutor.

the world health organization on 11 March announced the outbreak of a new coronavirus infection COVID-19 pandemic. According to the latest world health organization, worldwide there were more than 3.9 million cases, more than 274 thousand people died.