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Exposure to common cold coronaviruses can teach the immune system to recognize SARS-CoV-2 – MedicalXpress

  • Your immune system’s ‘memory’ T cells keep track of the viruses they have seen before.
  • New study led by scientists at La Jolla Institute for Immunology (LJI) shows that memory helper T cells that recognize common cold coronaviruses also recognize matching sites on SARS-CoV-2, the virus that causes COVID-19.
  • Having a strong T cell response, or a better T cell response may give you the opportunity to mount a much quicker and stronger response.
  • 40%-60% of people never exposed to SARS-CoV-2 had T cells that reacted to the virus showing that their immune systems recognized the virus.
  • This finding turned out to be a global phenomenon and was reported in people from the Netherlands, Germany, the United Kingdom and Singapore.
  • This discovery suggests that fighting off a common cold coronavirus can induce cross-reactive T cell memory against SARS-CoV-2.

https://medicalxpress.com/news/2020-08-exposure-common-cold-coronaviruses-immune.html

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Covid-19 Patients Not Infectious After 11 Days: Singapore Study – Bloomberg

Covid-19 patients are no longer infectious after 11 days of getting sick even though some may still test positive, according to a new study by infectious disease experts in Singapore.

A positive test “does not equate to infectiousness or viable virus,” a joint research paper by Singapore’s National Centre for Infectious Diseases and the Academy of Medicine, Singapore said. The virus “could not be isolated or cultured after day 11 of illness.”

https://www.bloomberg.com/news/articles/2020-05-24/covid-19-patients-not-infectious-after-11-days-singapore-study

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UCL: closing schools does not help control COVID-19 epidemic

School closure and management practices during coronavirus outbreaks including COVID-19: a rapid systematic review:

https://www.thelancet.com/journals/lanchi/article/PIIS2352-4642(20)30095-X/fulltext

Summary from BBC News:

  • While school closures help during influenza outbreaks, the same may not apply to coronavirus
  • Data from the Sars outbreak (in mainland China, Hong Kong, and Singapore) suggest that school closures did not contribute to the control of the epidemic
  • Recent modelling studies of Covid-19 predict that school closures alone would prevent only 2%-4% of deaths, many fewer than other social distancing interventions