Why is the death rate high in Mexico but nowhere else?

SHOOT: Possible answers:
1) It is too early to even make that assumption
2) The disease is still spreading and it is in the early phase of transmission (see no: 1)
3) Deaths elsewhere have occurred but have been supressed to avoid economic fallout

or:
4) The virus has evolved into a milder form (which seems somewhat farfetched).
5) The virus is evolving and is now in a 'dormant' harmless phase

clipped from news.yahoo.com Lopez-Gatell said that even before the swine flu outbreak, Mexican authorities had been monitoring a higher-than-usual number of flu cases and an unusual phenomenon in which otherwise healthy young adults were falling ill with pneumonia in greater numbers. There had been 15 flu outbreaks in this year's flu season, as opposed to the 5 or 6 that Mexico normally sees. Asked why the swine flu death rate is so high in Mexico while only one person is known to have died elsewhere, Waterman said that is one of the key questions they are trying to answer. One of the main reasons, they believe, is that there are a lot more people in Mexico who are sick than in other countries.