Corona virus: asymptomatic transmission “still an open question”


People who show symptoms represent

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People who develop symptoms present a “greater risk”.

A scientist from the World Health Organization has indicated that the extent of coronavirus infection transmission is not from people They show symptoms of the disease It is still largely unknown.

Dr. Maria Van Kerkhove said Monday that the transmission of the disease from people who show no symptoms is “very rare”.

But it has now confirmed that this observation is based on a relatively small group of studies.

Evidence indicates that people who show symptoms are the most likely to transmit infection, but they can transmit the disease before they show them.

Although the result of corona testing at a percentage of people who had no symptoms was positive, the number of people who would pass the infection to others, among them, is unknown.

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Dr. Van Kerkhof said that the evidence she was talking about came from the countries that implemented a “detailed tracking of contact” with others.

Looking at examinations of groups of injuries from multiple countries, she said that after following up on symptoms that did not show symptoms, it was “very rare” to find secondary injuries among those connected to these cases.

As for the possibility of the same being applied at the global level, the international scientist said that the matter is still a “big open question.”

Professor William Smith, an epidemiologist at the University of London’s School of Public Health and Tropical Medicine, said the uncertainties involved underline this importance of closures that “dramatically reduce the numbers of people affected”.

He said he was “surprised” by the WHO statement but did not see the data on which it was based.

He was Director of Health Emergency Program at the World Health Organization, Dr. Michael Ryan, he was absolutely sure of the transmission of infection from a person with no symptoms, but the question remains: to what extent it does.

Dr. Van Kirkhoff, Head of the Emerging Diseases Unit at the World Health Organization, divided between three categories:

  • People who have never had symptoms (without symptoms)
  • People whose corona test was positive, without showing symptoms yet – but showing it later (before symptoms)
  • People with very mild or unfamiliar symptoms who do not know they are infected with the Coronavirus

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Some reports distinguish between these categories, while others do not.

That, along with the relatively small groups of people surveyed, made it difficult to reach fixed conclusions, said Van Kerkhof.

However, she said, most of the evidence indicates that people who have never shown symptoms do not play an important role in transmitting the virus at the sites studied.

Studies that examined samples of the population to find cases without symptoms, and then tracked those who contacted those cases, found that the number of secondary infections was very lower for them, than for people who contacted cases that show symptoms.

This led the World Health Organization to conclude, in a guide issued at the end of the week about wearing masks, that: “Evidence from tracking callers recorded by Member States indicates that infected individuals are less likely to transmit HIV symptoms Many of those who show symptoms. ”

In England, the Office for National Statistics periodically examined samples of the population.

It was found that among those who had a positive test result so far, only 29% reported “any evidence of symptoms” at the time they were examined or during previous or subsequent visits.

“Risk aGrow up

Studies that track callers from a number of countries indicate that while “real” cases that do not show symptoms “rarely transmit” the infection, transmission of infection can occur before or on the day when symptoms begin to appear when they may be very mild, depending on Professor Babak Javed, Consultant Infectious Diseases at Cambridge University.

People can carry the detectable virus for about three days before showing symptoms, and they seem to be able to transmit it during this period, especially one day before symptoms start or on the same day they appear.

Professor Javed said the pre-symptom infection had “important implications” for tracking, tracing and isolation.

Under the terms of the now-activated caller tracking plans across the United Kingdom, callers to someone who transmitted the infection can be tracked before they develop symptoms, as soon as they show symptoms.

While people without symptoms appear to be able to infect others, current evidence still indicates that people who exhibit symptoms present a greater risk.

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