# 3185
Roughly half of all reported novel H1N1 influenza cases in the world are now from the United States, and North America lays claim to over 90% of the nearly 6500 confirmed cases.
The WHO maintains that community spread of the virus beyond North America has not been established, and therefore has not raised the pandemic alert level to Phase 6.
Reasons for these regional differences in the spread of the virus aren’t clear, although there is little reason to believe that the virus making its way to Europe and Asia is intrinsically different from the North American strain.
It may be that since other countries are seeing the virus later, they are better able to contain it. Some countries are being more liberal in their use of antivirals, and are quicker to isolate and quarantine suspect cases and and their contacts.
And of course, some countries may not be testing as aggressively for the virus as others.
Influenza A(H1N1) - update 28
14 May 2009 -- As of 06:00 GMT, 14 May 2009, 33 countries have officially reported 6497 cases of influenza A(H1N1) infection.
Mexico has reported 2446 laboratory confirmed human cases of infection, including 60 deaths. The United States has reported 3352 laboratory confirmed human cases, including three deaths. Canada has reported 389 laboratory confirmed human cases, including one death. Costa Rica has reported eight laboratory confirmed human cases, including one death.
The following countries have reported laboratory confirmed cases with no deaths - Argentina (1), Australia (1), Austria (1), Brazil (8), China (4), Colombia (7), Cuba (1), Denmark (1), El Salvador (4), Finland (2), France (14), Germany (12), Guatemala (3), Ireland (1), Israel (7), Italy (9), Japan (4), Netherlands (3), New Zealand (7), Norway (2), Panama (29), Poland (1), Portugal (1), Republic of Korea (3), Spain (100), Sweden (2), Switzerland (1), Thailand (2), and the United Kingdom (71).
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