 This other version, which is the one spreading throughout Africa that's causing so much concern, has been spread mostly between animals and humans, but recently, since September last year, it's been clear that it's been spreading between humans via close contact, still working out exactly how that happens, but also via sexual contact. We know, for example, that it's been spread through sex workers and so on. It seems to be much more severe. That's the key issue. There are higher fatality rates, particularly effects...