Including the US and Mexico, seven countries have officially reported cases of hybrid influenza A/H1N1.
As of April 28, laboratories had confirmed six cases in Canada, three in New Zealand and two each in the UK, Israel and Spain.
The World Health Organization has advised against restrictions on international travel, but is urging people showing symptoms of the flu to delay international travel and those developing influenza-like symptoms during travel to seek medical attention.
The organization has raised the pandemic level to five.
The infection is not transmitted through properly cooked pork or pork products. Officials also are advising thorough hand washing before eating.
The US has reported 64 confirmed cases of the flu while Mexico has reported seven deaths and 26 confirmed cases. Mexico has also attributed 1,600 suspected cases and 152 deaths to the H1N1 virus.