NEW YORK -- The swine flu virus continues spreading in New York City -- causing more schools to close and showing up in a jail -- while the disease also reached further into Asia among travelers returning from the United States.
An assistant school principal in New York remained hospitalized in critical condition Saturday and an inmate who entered the city's jail complex on Rikers Island about a month ago was diagnosed with swine flu Friday.
The city Department of Correction said that the flu hadn't spread to other prisoners in the 13,200-inmate system.
The Rikers Island inmate was improving since his hospitalization Wednesday and wasn't in serious condition, Correction Department spokesman Stephen Morello said.
The Centers for Disease Control and Prevention says more than 4,700 confirmed and probable cases have been reported in 46 U.S. states plus the District of Columbia. Five people have died in the United States, all with underlying ailments.
Internationally, Malaysia, India and Turkey have reported their first cases, all involving people who had traveled from the United States. They are in addition to the 36 other countries where the World Health Organization says more than 8,000 cases of the disease have been confirmed.
The assistant principal in New York, Mitchell Wiener, worked at one of six schools that have been closed for a week because of the latest rash of suspected swine flu cases.
City health officials are tracking schools with high absence rates. A spokesman for the United Federation of Teachers, Ron Davis, said it received reports from 18 other schools of high student absences and had forwarded the information to the city's health department.
In Turkey, health officials said the virus was detected in a man and his mother who had traveled to Istanbul from the U.S. The Health Ministry said the two had arrived Thursday in Istanbul via Amsterdam were traveling to Iraq.
Japan on Saturday confirmed its first case of swine flu caught within the country, meaning an effort to block the flu at the island nation's borders had failed.
The government ordered schools closed in parts of the port city of Kobe, where the Ministry of Health said a male high school student who had not recently traveled abroad tested positive for the virus. Two other students at the same school were suspected of having the virus.
The latest confirmed case is Japan's fifth overall. The first four -- three high school students and a teacher -- had recently returned from a school trip to Canada.
Mexico said tests have confirmed two more deaths from swine flu, bringing the nation's toll to 68. Health officials say tests confirmed 207 more cases for a total of 3,102, including the deaths.