Hapag-Lloyd container ship hit by positive tests, stuck in Durban

Hapag-Lloyd on May 20 issued a press-release with details on virus related incident, involving container ship MONTPELLIER:
Middle East India Africa Express (MIAX) service – MV “Montpellier” voyage 2017w – COVID-19 Incident
We regret to inform you that during normal operations our MV “Montpellier” voyage 2017w, deployed in our Middle East India Africa Express (MIAX) service, two members of the crew tested positive for COVID-19 in Durban, South Africa.
As a safety measure, the local authorities have ordered the vessel must remain at anchorage for 14 days, and has further directed that no cargo operations can be undertaken at this time.
Berthing at Durban and subsequent ports of the rotation will be adjusted accordingly.
Comment: Understood both positive tested crew remain on board, and generally, they’re well. Again, the same question – what, overall, does this testing mean and to what type of virus exactly people test positive, or negative, and why tests differ from country to country? Why in one case it’s negative, in another it’s positive, and why apparently healthy person may be found “asymptomatic patient”, what the hell does it mean?
Container ship MONTPELLIER, IMO 9314973, dwt 39418, capacity 2824 TEU, built 2006, flag Liberia.

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My name is Mikhail Voytenko, I’m Russian, professional merchant marine navigator, by education and former experience. I own and run Maritime Bulletin website for more than 10 years. I've been involved in solving a number of piracy hijack cases, including the hijack of ro-ro FAINA, loaded with tanks. It was me who made public, and unravel, freighter ARCTIC SEA mystery. I've been also closely involved in a number of maritime disaster, one of them being MSC FLAMINIA major fire.