The virus has the strongest spread before and after the symptoms of new crowns appear

The virus has the strongest spread before and after the symptoms of new crowns appear

Rapid testing and isolation after feeling unwell is the key to controlling the epidemic

International war "epidemic" operation

Science and Technology Daily, Beijing, August 26 (Reporter Liu Xia) As we all know, the new crown virus is highly contagious, but when its transmission capacity is the strongest has not been known.

Leonardo Martinez, an assistant professor of epidemiology at the Boston University School of Public Health, one of the research leaders, said: “Previously, scientists used viral load to indirectly measure infectious capacity, but we hope to observe the Following the case, to confirm whether the results of these past studies can be confirmed

From January 2020 to August 2020, Martinez and others tracked and studied about 9,000 close contacts of the new crown virus

Studies have shown that 89% of people identified as the primary case have mild or moderate symptoms, only 11% are asymptomatic, and no one has severe symptoms

Martinez said: "Our findings show that the timing of contact with the primary case is important for transmission, which further proves that rapid testing and isolation after someone feels unwell is a key step in controlling the epidemic

In addition, compared with individuals with mild and moderate symptoms, asymptomatic primary individuals are less likely to spread the new coronavirus to close contacts, but if they spread, contacts are less likely to show obvious symptoms