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Influenza A/H1N1: Mexico, US, Canada, New Zealand
26 April 2009
Canada
Four laboratory confirmed cases has been registered at Nova Scotia.
Source:  Yahoo News

New Zealand 
Ten students have tonight tested positive for influenza with health officials saying they consider it "likely" the pupils have swine flu. Th pupils had recently returned from Mexico, and are being kept in isolation at home along with their family members. One pupil had been hospitalised, 
Source:  Stuff.co.nz

United States 
The New York City department of Health suspects that a group of teenagers from a school in Queens is infected with the new influenza A/H1N1. 
Source:  New York City Department of Health

The CDC reports two cases in Kansas, 9 in California, 1 in Ohio, 2 in Texas and 8 in New York all laboratory confirmed: 
Source:  CDC

Mexico 
According to figures released yesterday by Mexico's health secretary there has been reported 1324 cases since 13 April 2009 with 81 deaths. Tests have confirmed swine flu as the cause of death in 20 of the cases. Suspect clinical cases have been reported in 19 of the country's 32 states.
Source:  ProMED

World Health Organization 
The WHO maintain influenza pandemic alert level 3: limited human to human transmission. On Saturday, 25 April, upon the advice of the Emergency Committee called under the rules of the International Health Regulations, the Director-General declared this event a Public Health Emergency of International Concern.
Source:  W.H.O.

Map of confirmed and suspected cases


Comment on A influenza, A/H1N1 
Travelling to Mexico carries a risk of infection with the new influenza A/H1N1 virus. Visitis to the USA carries a smaller risk, but more cases are expected to be reported over the few days. 

New Zealand 
It remains to be established that the infections in New Zealand are caused by the influenza A/H1N1 virus. 
United States and Mexico
The influenza A/H1N1 is probably more widespread in the United States than reported, and we can expect reports of new cases from new areas over the coming days. The disease process in the USA and New Zealand appears to be mild, and the difference to Mexico can be due to different methods of identifying cases with mild cases being missed in Mexico.
If the cases in New York and New Zealand are confirmed it is highly likely that cases will be found in other countries including Europe, where Mexico traditionally is a popular tourist destination. 
Canada
There is heavy trafic between Canada and Mexico and more cases are expected to be diagnosed in other areas over the next few days.

Influenza is traditionally seen on the northern hemisphere over the winter and during the last influenza pandemic in 1968/69, transmission ceased in the beginning of May and resumed in early September. 
If the virus is now established in New Zealand and has a pandemic potential, we will see a spread in the southern hemisphere from now on until September, and then a second wave of infections from September onwards on the northern hemisphere.