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Mayor Michael Bloomberg and Health Commissioner Thomas Frieden were on hand to welcome students back to Saint Francis Prep High School in Fresh Meadows.

Workers spent last week thoroughly sanitizing the school, which has the bulk of the city's confirmed cases of swine flu.

Some students said they were still a little hesitant about returning to classes.

"I'm a little scared. It's a little creepy," said a student. "I know they sanitized. I still feel a little uneasy about it."

"Coming back, I just want to see all my friends and how they're doing," said another. "I just hope the school is clean and it doesn't spread again."

The city says there are now 73 confirmed cases of H1N1 in the five boroughs, and health officials are still waiting for confirmation on six other possible flu cases.

Across the state, there are a total of 90 confirmed cases, 17 of which have surfaced outside the city.

Frieden says it is likely even more cases will be discovered, but that none reported so far have been any more severe than seasonal flu.

"The flu spreads, like other viruses, and we will be seeing it in the days and weeks to come in different populations, in all likelihood," he said. "The good news is it's no more severe, from what we've seen, from seasonal flu. We've looked at every intensive care unit in New York City every day for the last 10 days. We've yet to see a single person who has severe illness that could be from this."

There is one confirmed case in Nassau County and many probable cases around the state.

The mayor credited the city's response to the illness for the lack of severe cases.

"The important thing now is for students at St. Francis and New Yorkers across the city to continue to be calm and confident," Bloomberg said.

P.S. 177, a public school near St. Francis, also has several confirmed H1N1 cases. That school is scheduled to re-open Wednesday.

The Centers for Disease Control says there are now more than 280 confirmed H1N1 cases in more than 35 states, and more than 700 probable cases in 44 states.

Health officials say the increase is the result of catching up on a backlog of lab tests and streamlining federal procedures.

They also say they're working to prepare a vaccine.

In Mexico, the H1N1 death toll now stands at 26, with more than 700 people sickened by the virus.

Mexico City's mayor says the flu alert has been lowered and businesses and cafes are set to reopen Wednesday. Churches and museums will be allowed to open Thursday. It has still not been determined when bars, nightclubs and movie theaters can reopen.

Meanwhile, the virus is still spreading around the globe, with more than a thousand confirmed cases worldwide.

Some countries are taking drastic measures in response to the virus. China quarantined more than 70 Mexican travelers.

Mexico is calling the move discrimination and now says it will charter a plane today to bring its citizens home from China.