They answer the question ‘why some people never got COVID-19?’ it could be genetics or T lymphocytes. According to experts, people who say they never had COVID-19 may have had the infection asymptomatically or simply ignored the symptoms.
- According to Dr. Tara Hurst, people who say they never had the coronavirus may have had it asymptomatically or considered it a common cold
- Prof. Agnieszka Szuster-Ciesielska emphasizes that after vaccination it is difficult to determine whether a given person has actually undergone COVID-19
- Experts note that genes largely determine the course of the disease
- In turn, scientists from London have determined that the lack of coronavirus infection may be related to the immunity acquired from previous infections
- More information can be found on the TvoiLokony home page
Initially, the information that one of our friends actually fell ill with COVID-19 was something not very common, even sensational. After more than two years, it is difficult to find someone who has not had contact with the coronavirus. However, there are some who say they have never had COVID-19. The solution to this puzzle may be genetics or immunity acquired from previous infections.
«Covid lottery»
According to Dr. Tara Hurst, a lecturer in biomedical sciences at Birmingham City University, a large proportion of people who say they have never had the coronavirus are likely to have had it asymptomatically. – I would say that it is a group of 45 to 90 percent. people – he says in an interview with “Birmingham Live”. The expert also emphasized that not everyone had a cough or lost the sense of smell and taste, therefore some people could consider coronavirus infection as a common cold.
Dr. Hurst points out that not all test results were reliable. In turn, one of the studies she cited showed that 45 percent. people who tested positive did not actually have any symptoms.
The expert also pointed to the phenomenon of the “covid lottery”.
There is a population claiming to have never had COVID-19. There are also those who have managed to get sick with it even several times
— she said in an interview with «Birmingham Live».
Prof. Agnieszka Szuster-Ciesielska from the Department of Virology and Immunology, Maria Curie-Skłodowska University in Lublin, emphasizes that after vaccination it is difficult to determine whether a person has actually never undergone COVID-19.
Contact with the virus, even if it is asymptomatic, will result in the production of antibodies. Precise data could only be obtained by screening for antibodies. It should be remembered that their formation is provoked by both infection and vaccination. It is not such a simple endeavor
— explained the virologist in an interview with WP abcZdrowie.
The question of genes
Some people could actually avoid the infection. They owe it to their genes.
— It might be because of their genetics, but they basically have an immune system that is very strong and fights the virus — Dr. Hurst believes.
The opinion of the British expert is also confirmed by the words of prof. Szuster-Ciesielska.
There are specific studies that have confirmed this genes largely determine whether the course of COVID-19 will be light or severe. Symptomatic infection after exposure to the virus can be avoided by a strong innate response
— explains the virologist.
Prof. Szuster-Ciesielska emphasizes, however, that even in the case of people who have passed COVID-19 asymptomatically, symptoms related to long covid may appear.
The most common symptoms of long covid include:
- tiredness,
- brain fog,
- headaches,
- concentration and memory disorders,
- anxiety disorders.
Immunity from previous infections
There is a lot of research going on in the world — often associated with genetic differences — aimed at testing various hypotheses as to why some people did not get the coronavirus. Researchers from Imperial College London found that previously acquired immunity may be related to the number of cases.
We have found that high levels of pre-existing T cells, created by the body when infected with other human coronaviruses, such as the common cold, can protect against COVID-19 infection
— says Rhia Kundu, the author of the study, quoted by US News & World Report.
A study published in January this year surveyed 52 people who lived with someone who contracted the coronavirus. From the data collected, it was found that those who were not infected had significantly higher levels of T cells from previous infections.
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T lymphocytes constitute the largest group of lymphocytes, and their task is the cellular immune response (they destroy antigens).
While this is an important discovery, it is only one form of protection, and I emphasize that no one should rely on it alone. Instead, the best way to protect yourself from COVID-19 is to fully vaccinate, including a booster dose
— emphasizes Kundu.
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