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The idea that many cases of Covid are asymptomatic have a lot of things to keep at the hope that we have already had and conquered the new coronavirus. It's a convenient theory because, if it's true, you could have developed antibodies and you convince thatThe virus is not a correspondence for you. Now, a new study gives many Americans even more hope. UCLA researchers have found evidence that the virus could have circulated at the USS. From the end of December, on the basis ofthe rise of a common covidant symptom especially at the time:a cough.

The new study, published in theJournal of Medical Internet Research, has found a significant increase in the health clinic and visits to the hospitalPatients reporting respiratory symptoms From the week of December 22nd and continuing until February. Researchers examined the data of the three hospitals and 180 clinics in the UCLA health system and found that patients whosought after medical care because of a cough Exceeded the level of prediction of 95% throughout these months.

The researchers compared the number of patients reporting a cough with the average of the previous five seasons. For 1,000 visits, they found that there were two additional visits related to coughing that normal in the outpatient offices. Meanwhile, emergency departments saw 19 other visits as usual and hospitalizations withAcute respiratory failure has seen 39 additional visits than average. These figures demonstrate that a statistically significant increase inPatients with respiratory symptoms occurred from December to February in California.

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The most commonly accepted chronology is thatCOVID started in December in China, according to a January study inThe lancetand traveled in the rest of the world the following month.

However, further studies support the idea that the virus has been circulating for a long time before that. A study in theInternational Journal of Antimicrobial Agents reports that there was aPatient in France with COVID At the end of December, another study published inInfection, genetics and evolution Note thatCovid started circulating Between October 6th and December 11th.

If Covid was random from December 22, this completely changes the current centers of the Chronology of Disease Control and Prevention (CDC). According to the CDC, thefirst case of COVID was a resident of Oregon who had returned to travel to Wuhan and reported symptoms at a clinic on January 19, according toNew England Journal of Medicine.

Although it is almost impossible to know certainly if you had Covid in December, this recent study makes a convincing argument that those who affect a cough at the end of 2019 could have been fighting the virus at the beginning of the pandemic. And for more symptoms, patients can not tremble, checkThe 98 symptoms of lasting durable covidants you need to know.