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Few new news bits have caused as many swirls as recent comments made by the World Health Organization (WHO) about coronavirus propagation. After having declared publicly thatCOVID-19 asymptomatic transmission was "very rare", who drewcriticism of the medical community and back on the statements soon later. But in the process, we all learned a very important lesson: there is an important distinction between asymptomatic carriers and pre-symptomatic people. Asymptomatic patients are those who are infected but never develop noticeable coronavirus symptoms, while those who are pre-symptomatic are infected but have no symptoms yet. And it is the second group that we should perhaps be the most worried. According to a recent study,Patients who still show symptoms are responsible for the transmission of nearly half of coronavirus cases.

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An April report in China, published in the journalMedicine of nature, found this "44% of the secondary cases have been infected during cases of "pre-symptomatic stage" index. "Translation? Almost half of the cases of coronaviruses come from those who are sick before their symptoms do not even appear. On the basis of these conclusions, the authors suggest that" disease control measures must be adjusted to hold account of pre-symptomatic probable transmission. "

This report reflects what has been found in other studies that seek to evaluate the most contagious points of the virus infection cycle. According to another study recently published in the magazineEurosurveillanceThe collected data showed that 48% of cases in Singapore and 62% in Tianjin, China, werecaused by pre-symptomatic individuals.

Another study, also published in the newspaperMedicine of nature and conducted by researchers at the WHO Collaboration Center for Epidemiology and Infectious Disease Control in China, found that patients areMore likely to spread COVID-19 Up to 72 hoursBefore showing signs of having contracted the virus.

This is part of the reason why coronavirus is so difficult to follow and control. The authors of these studies urge the medical community and public officials to use effective preventive measures, such asContact Tracing, to prevent new epidemics from growing. And for more information on the propagation of COVID-19, checkThe surprising thing making coronavirus up to 10 times more infectious.