And in Israel, doctors are running tests on a man who recently returned from Mexico with light flu symptoms.
CNN: U.S. prepares for possible swine flu epidemic as global cases rise
For instance, Tim awoke one morning in Mexico with raging flu symptoms.
President Calderon has stopped short of declaring "mission accomplished" against swine flu in Mexico, but the battle to lure visitors back to this country has begun.
Argentina, which has reported 386 deaths attributed to H1N1 as of August 13, ranks first per capita, the Brazilian health officials said, and Mexico, where the flu outbreak was discovered in April, ranks 14th per capita.
The WHO raised the alert to the second highest level of five on Wednesday after a Mexican child died while on a visit to the US state of Texas - the first death from the swine flu outside Mexico.
In London, a hospital spokesman said a British Airways crew member developed flu-like symptoms during a flight from Mexico City and was tested for swine flu, but the results came back negative.
CNN: U.S. prepares for possible swine flu epidemic as global cases rise
The quarantine was imposed more than a week ago after the 25-year-old guest from Mexico tested positive for swine flu.
Delta is also cutting its weekly frequency between Atlanta and Detroit to Mexico City due to the flu's impact on consumers' travel plans.
CNN: Delta cutting capacity, blames rising fuel prices, H1N1 virus
Even before the flu outbreak, Mexico had been especially hard hit, because its economy is so closely tied to that of the United States.
Mexico has the most confirmed swine flu cases, with 506 infected people and 16 deaths, the WHO said.
The World Health Organization on Monday raised its pandemic alert level in response to the outbreak of swine flu that originated in Mexico.
He had visited Mexico and tests showed he had swine flu, Shelton said.
The H1N1 virus, which causes swine flu, first appeared in Mexico in 2009 and rapidly spread around the world.
The first cases of the virus were detected in Mexico, where health officials suspect swine flu in more than 150 other deaths and roughly 2, 500 illnesses.
"I walked in and said 'I'm from Mexico but I don't have Swine flu', " she says, joking.
For the moment, he said, there is not enough information about the swine flu that has sickened hundreds in Mexico and about 50 people in the United States to accurately forecast how the disease will travel.
In New Zealand, officials said 22 students and three teachers, who returned from a three-week language trip to Mexico, may have been infected with the swine flu virus.
CNN: U.S. prepares for possible swine flu epidemic as global cases rise
The flu has been blamed for 26 deaths: 25 in Mexico and one in the United States, according to the World Health Organization.
On Saturday, the virus strain was found in a herd of swine in Alberta, Canada, and the animals may have caught the flu from a farmer who recently returned from a trip to Mexico.
Swine flu is so far thought to have killed nearly 160 people in Mexico.
The 91 confirmed cases in the United States includes the country's first swine flu fatality: a 23-month-old child visiting from Mexico who died Monday at a Houston, Texas, hospital.
One of the reasons medical experts are nervous about the swine flu outbreak is that many of the people who have died in Mexico have been young and otherwise healthy.
China suspended flights into and out of Mexico after a 25-year-old Mexican man who arrived in Shanghai from Mexico City on April 30 became China's first confirmed case of swine flu.
CNN: Mexico lowers swine flu alert as businesses in capital reopen
The United States' first death from swine flu came last week: a toddler whose family was visiting Houston, Texas, from Mexico.
The news came as officials in the United States and Mexico, where the outbreak of the H1N1 virus started, were voicing hope that the worst of the new flu strain may be over.
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