Morning mail: Quarantine hotel risks, Craig Kelly's disappearing posts, Trump's revenge

Friday: Calls to get security guards out of quarantine hotel corridors. Plus: Collingwood players say sorry

Good morning, it's Friday 5 February, and Imogen Dewey here bringing you the latest on the virus-that-need-not-be-named, Trump's impeachment trial and still more about Craig Kelly.

Epidemiologists say we need to get guards out of quarantine hotel corridors and get fresh air and CCTV in - pointing out, reasonably, that it doesn't make sense to man corridors given they could spread more infectious variants of Covid-19. The warning comes after an Australian Open quarantine hotel worker in Melbourne tested positive for coronavirus four days after another guard tested positive in Perth (where it's still masks on outdoors, please). Authorities aren't ruling out airborne transmission, but Daniel Andrews doesn't expect the outbreak to affect the Australian Open - though the draw has been pushed back. Meanwhile, as our borders stay shut to most others, international students are starting to look elsewhere for their studies.