The novel coronavirus infection is a highly contagious disease. This means that the virus is prone to massive spread from infected people to healthy ones. How the transmission of coronavirus is carried out and how much time the sick person poses a danger to others — we will find out in this article.


Epidemiology of COVID-19

Initially, it is important to recall the epidemiological characteristics of the virus. COVID-19 is an anthroponotic viral infection, that is, transmitted from person to person. Accordingly, the sources of infection are sick people or asymptomatic virus carriers.

The virus is spread through the airborne route of transmission, which is realized when sneezing, coughing and talking. The contact route of transmission, which is carried out when interacting with objects that the patient has touched, is not excluded. In this case, infection occurs if you do not wash your hands after that and touch them to the mouth, nose and conjunctiva of the eye.

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Pathogenetic features of coronavirus infection

The entry points for COVID-19 are the mucous membranes of the mouth, nose, and eyes. Once in the body, the coronavirus multiplies in the epithelial tissue of the upper (nasal cavity, nasopharynx, oropharynx) and lower (larynx, trachea, bronchi) respiratory tract.

Further, the virus particles penetrate into the cells of the lungs — alveocytes, leading to an inflammatory process. Through the wall of damaged alveocytes, COVID-19 enters the bloodstream, causing powerful intoxication. You have probably come across the term “cytokine storm” on the Internet. It causes the body’s immune response to the introduction of infection.

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When does a person become contagious and at what point does he cease to be a danger to others?

According to the laws of microbiology, a person becomes contagious from the moment the virus enters his cells and begins replication, that is, reproduction. According to the Interim Guidelines “Prevention, Diagnosis and Treatment of COVID-19”, an infected person carries the greatest epidemiological danger during the last two days of the incubation period and the first two days from the onset of symptoms. The incubation period is the period of time from infection to the onset of clinical manifestations.

It is impossible to name the exact dates when a person ceases to be contagious. It depends on several factors:

  • individual characteristics of the immune system in each person
  • severity of coronavirus infection
  • the presence of comorbidities
  • asymptomatic course or rapid clinical manifestations of the disease

Of course, the more weakened the immune system and the more severe the course of the disease, the longer the person will get sick and infect others. The presence of comorbidities also exacerbates the situation. The presence of severe symptoms increases the chances of spreading the virus, as the infected person will shed particles of COVID-19 when sneezing and coughing.

Melita Vujnovich (representative of the World Health Organization in Russia) named the estimated time for the infectivity of people with COVID-19 — 8-9 days after the onset of the first symptoms of the infectious process. All further manifestations of the disease most often occur as complications of the disease or are considered as part of the post-covid syndrome.

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How can you more accurately determine if you are contagious after suffering a coronavirus?

To find out exactly if you are contagious, a rapid test for the COVID-19 antigen will help. Regardless of the presence or absence of symptoms, testing determines whether there is a particle of coronavirus in the contents of the nasopharynx.

The main advantages of express analysis are the fast speed of obtaining results, the high accuracy of the study and the ability to do it in any place and at any time convenient for you.

The PBCheck and Genrui tests have excellent sensitivity to coronavirus and specificity to its different strains, confirmed by research from the Research Institute. Sklifosovsky. You can get their reliable result after 10-15 minutes.

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You can purchase these tests from BIONOM. We supply medical products, including rapid tests for coronavirus. Our company cooperates with scientific centers of South Korea, China, Japan, USA and Russia, which develop innovative diagnostic systems. All products are clinically tested in the best research centers in our country and abroad, one of which is the Research Institute. Sklifosovsky.

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