Covid-19: immune memory could last more than eight months

The more time passes, the more perspective we have on the natural immunity developed by ex-Covid-19 patients. In November, we could say that antibodies against … Read more

Covid-19: what do we know about virus mutations in South Africa?

While the virus is constantly mutating (over 12,000 mutations have been identified over the past year), a variant of concern has been reported by the … Read more

Prevent HIV by one injection

It’s a ritual. For thirty-three years, the 1is December is World AIDS Day. But this year, one pandemic is chasing another. To the point that … Read more

Covid-19: what does the new distinction between “positive” and “weak positive” correspond to in the result of PCR tests?

Question asked on 10/08/2020 Hello, The analysis of the results of RT-PCR tests that measure the viral load of Sars-CoV-2 in a patient has been … Read more

Anti-Covid treatments: what is Trump the guinea pig of?

It was in a triumphant tweet that Trump announced his discharge from hospital on Monday evening. “I feel really good! Don’t be afraid of the … Read more

Positive but not contagious: the blind spot of PCR tests

Is being positive for Covid-19 necessarily synonymous with contagiousness? Or, on the contrary, does this correlation, which is more complex than it appears, necessitate refining … Read more

“There is no reason for schools to become reservoirs for viruses”

School, reservoir for viruses: chiseled by seasonal epidemics of influenza and gastroenteritis, the image dies hard. Except with the Sars-CoV-2, the rule suffers exception. According … Read more