Despite the decline in China , the number of coronavirus cases is increasing in Europe , Asia and America. Recently, China has given good news about the situation of coronavirus. On Monday morning, the country's state television CCTV announced that no Kavid-19 patients had been found in 13 provinces of the country. No new cases have been reported. However, Chinese researchers are continuing research on coronavirus. A recent study has come up with a new information. There is a link between the deadly contagious disease and the human blood type. According to the Chinese media South China Morning Post , ' A-positive' and 'A-negative' group members are at higher risk of contracting corona. And those with 'O-positive' and 'O-negative' blood groups are at relatively lower risk of becoming infected. This is according to a study by Chinese researchers. Researchers at Uhan University of Medicine recently tested the blood of 2,000 patients in the coronary artery Uhan and later in Shenzhen. It can be seen that most of the corona patients have 'A-positive' and 'A-negative' group. And the number of 'O-positive' and 'O-negative' blood group holders is less than the number of those 2,000 patients. At the end of the study, scientists tested the blood groups of 208 people who died of coronary heart disease. They found that out of those 206 people, 65 were blood group of 'A' group and 52 were of group 'O'. According to the statistics , the mortality rate of patients in ' A' group is 73 percent higher than that of patients in 'O' group. Wang Jinghuan, head of the research team, said : " This is what we have seen . There, it has been seen that the people of ' A' group are suffering from the most corona and are dying again. On the other hand, coronary heart disease risk is much lower for those with 'O' group. He said the study is still unfinished. Because we do not yet know the reasons why the effects of corona in different blood groups are different and only if we know this can we get rid of this deadly virus. So far, however, research has shown that group A holders need to take extra precautions to avoid the risk of infection.