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Pneumonia is very rarely actually diagnosed down to which specific microbe is causing it. Not all patients with pneumonia have the same clinical features, these can vary. If a pneumonia case looked a bit different to usual, and if there are fatalities, which seems to be the case here, then you might expect to find the cause. But unexplained pneumonia cases probably happen frequently and are not reported, meaning it is hard to know how common things like this really are.