As is well known, there are many myths associated with the coronavirus. But a university in Zurich has found that a cold offers to a certain extent protection against illness against Sars-CoV-2. This is what the Swiss online portal “blick.ch” reports. Virology professor Alexandra Trkola from the University of Zurich emphasized that immune reactions specifically directed against Sars-CoV-2, which originate from memory cells, are far more effective than cross-reactive ones. Cross-reactions therefore shorten the course of the disease and, according to Trkola, alleviate its severity.
Together with her team, the virology professor examined the amount of different antibodies against four human coronaviruses in the blood of 825 donors from the time before the occurrence of Sars-CoV-2 as well as 389 samples from donors who were already infected with the novel coronavirus to have each other. The result? To a certain extent, previous immunity to cold coronaviruses can protect against infection with Sars-CoV-2. The risk of hospitalization can also be reduced.
As the research team reports in the journal “Nature Communications”, there is a plausible explanation for the high proportion of asymptomatic and mild Sars-CoV-2 infections – namely the effect of these cross-reactions. It is well known that immunity against the coronavirus does not last long. However, the vaccines should extend this immunity. However, if it turns out that immunity strengthens the defense against other human coronaviruses, one could come closer to comprehensive protection, according to Trkola. This also applies to the newly emerging variants.
According to researchers, research results have shown that an everyday cold can give some people a head start against corona. This is also confirmed by a study from Great Britain.