A crucial role is played by the state of the immune system
Scientists have found that SARS-CoV-2 penetrates into healthy cells of the body by binding to ACE2 cell receptors, while the incubation period can last up to two weeks.
According to experts, the development of the immune response plays a decisive role in reducing the viral load (the number of viral particles per unit volume of fluid – approx.) And preventing the development of severe symptoms. According to one hypothesis, in children innate immunity is stronger, which explains the mild course of the disease in minors.
Acquired immunity comes to the aid of healthy adults. Its early production allows the body to recognize the pathogen in the initial stages and immediately begin to fight the infection.
But if the virus manages to penetrate the lungs, then the patient may develop symptoms characteristic of pneumonia such as fever, cough with sputum and shortness of breath. In some cases, an overreaction of the immune system can lead to a cytokine storm, a systemic inflammation that damages vital organs.
At risk are older people and those who suffer from chronic diseases. They may develop acute respiratory distress syndrome when fluid fills the lungs and impairs breathing, which can be fatal.
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