Science and Technology Daily, Beijing, August 26 (Reporter Liu Xia ) It is well known that the new crown virus is highly contagious, but it has not been known when its transmission capacity will be strongest.
Liu Xia 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 ability, 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
Focus on the new crown pneumonia epidemic
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