The efforts they took to prevent the spread of that infection were pretty thorough or so it seemed (Diablo iii Gold). But it's also interesting how they can use genetic mapping to locate the source of an infection. If I remember correctly it was only people who stayed in that room where the first infected patient was isolated (under quarantine).
I know if you have ever had drain gnats you realise gunk stays on the drain pipes so gnats can feed off of or use for breeding, (I forget now which it is); but your drain at home can be a source of an infestation. I guess it can be a source for infectious bacteria too. Of course you home sink would have food stuck to the inside of the pipes but a patient's bathroom sink could have all sorts of stuff stuck to the pipes, who knows. The bacteria can live off that gunk but I'm not sure how it gets to the patients. If they are able to brush their teeth in that sink maybe that's enough.
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