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One study carried out by Chinese experts and published this Wednesday 15 in the “Natural medicine“reveals that about half of transmissions of COVID-19 occurs before symptom diseases arise. That is, when the infected person does not yet know that they are sick.
Therefore, they recommend scientiststhe infection control and prevention measures it must conform to this reality. It does not help, for example, that only the sick are isolated. Apparently, healthy people must also comply with quarantine and social detachment measures.
He researchers used information on the patterns of viral spread in the body of 94 patients with COVID-19 and also data on the infectious profile of the disease in 77 pairs of people, consisting of those infected and those who transmitted the virus.
In throat samples, scientists observed that the higher viral load It occurs the moment the first symptoms appear. From this information, they deduced that the peak of the virus’s transmission capacity is precisely before the first symptoms.
Scientists have discovered that 46% a 55% of the infected became infected before the person responsible for transmission had any symptoms. The survey shows that transmission begins to occur 2 to 3 days before the onset of symptoms, and the transmission peak would be the day before.
“Measures to control the pandemic must conform to a reality of substantial pre-symptomatic contagion,” the researchers wrote.
That means Social isolation, contact tracking, wearing a mask, increased personal hygiene measuresAmong other preventive measures, they will not be as effective if they are taken only by people who already have symptoms.
The study cites the example of the 2003 Severe Acute Respiratory Syndrome (SARS) epidemic. Although it was much more lethal than covid-19, with a mortality rate that reached 10%, SARS was only transmitted after the onset symptoms, which facilitated the containment of the epidemic.
