A German study of people who recovered from the emerging coronavirus (Covid-19) reduced the hopes for long-term immunity, and hence the long-term efficacy of any potential vaccine against the disease. Clemens Wintner, the chief physician at the Clinic for Clinical Schwabing in Munich, said that blood tests for the first "corona" patients in Germany who were treated at the hospital at the end of January showed a noticeable decrease in the number of so-called neutral antibodies in the blood.
He added: "In four of the nine patients, we found a decrease in the number of neutral antibodies in a highly specific test that can only be performed in a high-safety laboratory." He explained that «the extent of the impact of this on long-term immunity and serum strategies, is still a matter of guesswork, and must be followed closely in the next stage», and added that the results indicate the possibility of a new infection for the person who recovered from the disease, and must continue to follow up This matter.