By BETSY MCKAY
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Commuters in the subway in Mexico City on Tuesday.
More evidence of the global spread of a deadly flu emerged Tuesday, with new cases reported on four continents and a growing number of people in the U.S. requiring hospital treatment.
Health authorities said they have found possible cases of the new strain of A/H1N1 swine flu in the Middle East and Asia.
In the U.S., the number of confirmed cases rose to 66, including five people in California and Texas being treated at hospitals, according to the Centers for Disease Control and Prevention and state health departments.
The new data indicated the strain was causing more severe illness in the U.S. than originally seen; only one of the first 40 confirmed cases had to be hospitalized. President Barack Obama on Tuesday asked Congress for $1.5 billion in additional funds to fight the epidemic, and lawmakers convened for a hearing to evaluate measures taken so far.
Many of the people confirmed with the swine flu outside Mexico were infected on trips to the country, officials said.
There also is evidence of transmission in the U.S.
Officials said 45 people got sick at St. Francis Preparatory School in the New York City borough of Queens after students returned from a trip to Mexico. The 45 ill include several students, staff and relatives who didn't go to Mexico but who may have caught the virus from those who did.
Mayor Michael Bloomberg said Tuesday that it was likely additional students had contracted the virus at St. Francis, a private Catholic school with 2,700 students. Hundreds of students, as well as staff, became sick with flu-like symptoms. The city decided against further testing to instead focus its investigation on new clusters of the virus.
New cases of swine flu were suspected among students of two additional schools in New York City, where 44 residents have confirmed cases, Mr. Bloomberg said. About 12 students at P.S. 177, a public school in Queens, are suspected of having the virus.
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In California, Gov. Arnold Schwarzenegger declared a state of emergency Tuesday. The measure sets in motion a series of actions, such as requiring all agencies to coordinate with public-health officials, suspending competitive bidding for contracts needed to respond to the outbreak, and waiving certification requirements for laboratories involved in testing.
Public-health officials said they were trying to balance two missions: prepare for the worst possible outcome while avoiding a public panic. The tasks are complicated because they don't know how lethal the virus is.
Many people assume a pandemic is a deadly scourge, but two of three flu pandemics that circled the globe in the 20th century were relatively mild. "Pandemics can range from being relatively mild to being extremely severe," said Keiji Fukuda, the World Health Organization's acting assistant director for health security and environment. "My own sense right now is it too early to make a call."
Although the WHO raised its pandemic alert to phase 4 from phase 3 on Monday, it has not warned people to curtail travel. Although several countries -- including the U.S. -- issued their own travel advisories for swine-flu-affected countries, such restrictions "would not significantly hamper the movement of this virus," Dr. Fukuda said.
It is impossible to predict how virulent the new strain could become because flu viruses are notoriously fickle and swine-flu viruses in humans are rare, said Richard Webby, a virologist at St. Jude's Children's Research Hospital in Memphis, Tenn. The hospital operates a laboratory that collaborates with the WHO to study animal-flu viruses.
The outbreak disrupted schools across Texas during its week of state standardized testing. Schools in several communities shut down, and others reported high absentee rates.
In Rio Grande City, a short walk from the U.S.-Mexico border, nearly 1,800 students stayed home Tuesday, compared with a normal absent roll of about 150 students, said Superintendent Roel Gonzalez. Many students wore masks to school, and some were apparently suffering flu symptoms. Mr. Gonzalez fielded worried calls from two schools reporting that students had vomited during the state testing.
On the advice of health authorities, Mr. Gonzalez shut down Veterans Middle School for the rest of the week. Two students at the school had unconfirmed but "highly probable" cases of swine flu, according to Jose Vasquez, director of the county health department.
Jung Yeon-je/Reuters
A thermal scanner shows the heat signature of passengers from an international flight arriving at Incheon airport, west of Seoul, South Korea, Tuesday.
Dr. Vasquez said a shortage of supplies was hindering efforts to identify cases and make decisions on school closings. In the past 48 hours, he said, 300 patients with flu-like symptoms had arrived for testing.
New Zealand confirmed that 11 people who recently returned from Mexico contracted the virus. They suffered only mild illness and were expected to recover, officials said. Reports of confirmed illness or suspected swine flu also came from Spain, Israel, China and South Korea, among other countries.
Among the measures they are taking to calm the public, U.S. government officials are considering a change to the new disease's current moniker. Swine flu makes some people think they can get the disease from pigs or pork, said acting CDC Director Richard Besser.
"That's not helpful to pork producers. That's not helpful to people who eat pork. It's not helpful to people who are wondering, How can they get this infection?" he said.
Agricultural groups, worried the flu outbreak is scaring away consumers from pork, are prodding the federal government to refer to the virus as H1N1.
—Suzanne Sataline, Jonathan D. Rockoff, Stephanie Simon and Ethan Smith contributed to this article.
Write to Betsy McKay at [email protected]
Printed in The Wall Street Journal, page A6