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COVID-19: seniors could be contagious longer | Coronavirus

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We grew the first virus in Canada, proudly explains Dr. Hugues Charest, head of the molecular biology sector at the Laboratoire de santé publique du Québec.

Grow a virus means taking samples from positive COVID-19 tests to check, among other things, how long the virus is multiplying in the cells. The results suggest that the contagion ceases after 10 days. These studies conducted around the world have influenced the duration of isolation of patients, but they have also raised eyebrows Dr. Yves Longtin, a microbiologist-infectiologist at the Jewish General Hospital in Montreal.

ans.”,”text”:”One of the difficulties of these studies is that they recruited relatively young participants. The average age is between 35 and 50.”}}”>One of the difficulties with these studies is that they recruited relatively young participants. The average age is between 35 and 50 years old.

Dr. Longtin was worried about the fact that the elderly are nevertheless contagious for more than 10 days when they contract influenza, given the weakness of their immune system. The Jewish General Hospital of Montreal has therefore recruited 22 patients aged 80 and over to verify whether COVID-19 is still present on day 10.

Surprised by the results

12 out22 still contagious, we realize that something may be happening. It’s a signal. It was expected, based on previous studies, that 99% are no longer contagious at 10andday after the onset of symptoms. […] This suggests that scientists have assumed that older people are as contagious as younger people, although they may be so longer”,”text”:”We were very surprised! When you are in the order of 12 out of 22 still contagious, you realize that something is possibly going on. It’s a signal. It was expected, according to previous studies, that 99% would no longer be contagious by the 10th day after the onset of symptoms. […] This suggests that scientists have assumed that older people are as contagious as younger people, although they may be so longer”}}”>We were very surprised! When we are in the order of 12 out of 22 still contagious, we realize that something is possibly happening. It’s a signal. It was expected, according to previous studies, that 99% would no longer be contagious by 10and day after the onset of symptoms. […] It suggests that scientists have assumed older people are as contagious as younger people, though they may be so for longer., says Dr. Longtin.

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According to his colleague, Dr. Hugues Charest,days”,”text”:”we now know the potential danger that an elderly person who is sick for more than 10 days can cause”}}’>we now know the potential danger that an elderly person who is sick for more than 10 days can cause.% of these people are still infectious”,”text”:”We now know on paper that 50% of these people are still infectious”}}’>We now know on paper that 50% of these people are still infectious, he adds.

Dr. Longtin and his team are launching an international appeal to scientists to validate this research with other samples. Questions arise:days, 15days, 20days? We will have to do another study where we will follow patients longitudinally and test them at several times to be able to determine when they are no longer contagious.”,”text”:”Do the elderly remain contagious 12 days, 15 days, 20 days? We will have to do another study where we will follow patients longitudinally and test them at several times to be able to determine when they are no longer contagious.”}}”>Do the elderly remain contagious for 12 days, 15 days, 20 days? We will have to do another study where we will follow patients longitudinally and test them at several times to be able to determine when they are no longer contagious.

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Quebec is not in a position to do so, since the majority of seniors are now vaccinated, which will influence the results.

Thus, public health organizations may have underestimated the contagiousness of seniors during the pandemic.days, and we lifted their isolation because we were following the recommendations”,”text”:”Perhaps, without knowing it, we had patients in long-term care centers who had COVID for 10 days, and we lifted their isolation because we followed the recommendations”}}’>Maybe, without knowing it, we had patients in long-term care centers who had COVID for 10 days, and we lifted their isolation because we followed the recommendations, continues Dr. Yves Longtin.

His study could therefore contribute to providing some answers to surveys aimed at explaining the carnage that occurred in CHSLDs in Quebec during the first wave.

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