A electron microscope image of SARS-CoV-2, the virus that causes Covid-19. Photo: EPA A electron microscope image of SARS-CoV-2, the virus that causes Covid-19. Photo: EPA
A electron microscope image of SARS-CoV-2, the virus that causes Covid-19. Photo: EPA

Covid-19 reinfections can be more severe. Should we all worry?

  • Covid-19 struck a Nevada man twice, and second time was worse
  • Degree of protective immunity after an infection is a great unknown

Topic |   Coronavirus pandemic
A electron microscope image of SARS-CoV-2, the virus that causes Covid-19. Photo: EPA A electron microscope image of SARS-CoV-2, the virus that causes Covid-19. Photo: EPA
A electron microscope image of SARS-CoV-2, the virus that causes Covid-19. Photo: EPA
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