Confirmations scientifiques 15
Ce fait contribue également à la propagation de la maladie, ainsi qu'au laxisme de la recherche, c'est pourquoi on ne reconnaît pas que, d'une part, l'agent pathogène est beaucoup plus infectieux qu'on ne le pense, mais que, d'autre part, on ne reconnaîtra pas avant longtemps que la période d'incubation n'est pas seulement de 14 jours, mais qu'elle peut aller jusqu'à un mois, voire jusqu'à 3 mois.
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On average, COVID-19 patients shed infectious virus particles for about eight days. But 70 days after her diagnosis, the patient was still shedding infectious particles. By mid-June, more than 100 days later, the woman was still testing positive — meaning her body still contained traces of the virus' genetic material.
"We think that at least up to day 70, this patient would have been able to spread the virus to others," Vincent Munster, a virologist at National Institute of Allergy and Infectious Diseases, told Business Insider. Munster is the lead author of a recent case study about the woman.
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According to Munster's study, published in the journal Cell earlier this week, the patient's 70-day period of infectiousness is the longest such span ever seen in an asymptomatic coronavirus patient. For comparison, the longest-known span of infectious shedding for a symptomatic person is 61 days, according to an October study.
Researchers believe the situation arose because the woman's weakened immune system was unable to mount a substantial defense against the virus. Her blood tests never showed substantial amounts of antibodies, which in most patients help fight off infections. But she also never developed symptoms.
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The patient in the new case study, however, had a distinctively weak immune system, Munster said. That means a 70-day infectiousness period like hers is probably rare. The woman had a 10-year history of chronic leukemia, which is a type of cancer that infects white blood cells, an integral part of the immune system. She'd been hospitalized for anemia, a condition often related to leukemia because it depletes red blood cells.
She also had a condition in which the immune system can't make substantial antibodies, known as hypogammaglobulinemia.
"We think that this is a relatively rare occurrence tied to the very specific immune status of this patient," Munster said.
https://www.businessinsider.fr/us/patient-with-coronavirus-shed-virus-for-70-days-2020-11