Researchers were largely sure, that once Infected and recovered for a longer period of time are immune to Sars-CoV-2. A study out of China questioning the and keeps immunity passes for “pointless”.
As long as there is still no vaccine on the market that may restrict Physicians in the treatment of a Covid-19-Infected only to the relief of his symptoms. Pleasing is the fact that patients after they survived the disease are immune to Sars-CoV-2 is all the same. Because it was in the past a few skeptics, most scientists today agree that a Genesener after the disease is, at least for a time immune.
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So, for example, the Robert-Koch Institute, writes: “The experiences with other corona virus infections (Sars and Mers) suggest that the immunity could last for up to three years.” The experts see low risk for already Convalescent, to infect again. Also, the WHO and several experts point to the experience with other coronaviruses and are optimistic that a history of infection at least temporarily to a immunity. And: “There is currently no medically documented case in which someone immunologist Thomas Kamradt explained for a second Time to Covid-19 diseased”, in an interview with FOCUS Online. .
He, too, is based on the experience from the first Sars epidemic, as well as with a cold corona viruses. You speak according to him, for immunity, the stop at least “a few years”. During this time, Sars-CoV-2 had also no possibility, in the body of the Person to penetrate: “Immune means I’m protected, and I protect the others.”
New study doubts immunity after infection
The evidence that the immunity of certain antibodies in the blood. Who was infected with Sars-CoV-2, it forms a rule in the weeks after infection. However, this is apparently not always so. A Preprint Server Medrxiv published study by the University of Lübeck showed that there are people found to have been infected with the Coronavirus, in which the researchers but were unable to detect any antibodies.
Now a new study from China raises questions about the immunity after Sars-CoV-2 infection. The researchers examined whether people who have been infected with the Coronavirus and symptoms suffered, after they survived the disease longer immune as those in whom the infection was unnoticed.
Your result: In asymptomatic patients, the concentration of the antibody, in fact, decreased after a short time, and some were demonstrated after three months, no more. What, in turn, could mean that these could be infected after surviving infection with the Virus. Their study, published by the Chinese scientists in the journal “Nature Medicine”.
After three months, no antibody is detectable
The researchers compared 37 Corona-Infected without symptoms in the Chinese Region of Wanzhou with the same number of people, in which symptoms occurred. They found that the asymptomatic group of three to four weeks after infection, only 62.2 percent had short-term antibodies in the blood, compared with 78.4 percent of the patients had symptoms.
After eight weeks, the number of antibodies was decreased in the first group to 81.1 percent, in the case of the people with symptoms to 62.2 percent. And after three months the antibody level was at 40 percent of the asymptomatic people to a non-detectable Level decreased, compared with only 13 percent of the symptomatic persons. In addition, were found in asymptomatic patients and less to the immune response, involved in cell proteins, which would indicate a weaker immune response to the Coronavirus.
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However, about a third of the asymptomatic patients had the Covid-19 characteristic “lung shadows” and other anomalies of certain cells. The study also found that symptom-free people are shedding virus, and this even over 19 days – four days longer than those who symptoms. Another note is that even people without symptoms can infect others.
Immunity badges, according to the researchers, pointless
These data made it clear that the introduction of immunity identity cards, as Minister of health, Jens Spahn suggested also for Germany, probably little makes sense, say the authors of the study. The proof of such immunity would probably be via these antibodies in the blood, but their results can doubt that anyone who has an infection behind, be against future infections immune.
So far, many of the immunological data were derived for the Coronavirus pandemic of hospital patients with severe forms of the disease, said Danny Altmann, Professor of immunology at Imperial College London. Most of the Infected have only mild or no symptoms. It is, therefore, a crucial question is whether they, too, had a long-lasting, protective immunity. 
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