The number of infections in the United States rose to 65, Canada has 13 and new cases were also confirmed in Israel and New Zealand.But global health officials cautioned that the numbers meant little in a rapidly changing situation, with doctors and clinics rushing to test people with respiratory symptoms and no one sure just how far the virus had spread.
Americans, Canadians and Europeans were advised by their governments to avoid non-essential travel to Mexico. Argentina halted all flights from Mexico until Monday and Cuba cut air links for 48 hours.
Mexico closed all of its archeological sites until further notice on Tuesday, and cruise ships and tour operators turned away from the country, threatening to batter a tourism industry that is its No. 3 source of foreign currency.
In the United States, President Barack Obama asked Congress for an extra $1.5 billion to fight the flu threat, and California declared a state of emergency, allowing it to deploy more resources to prevent new infections.
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