Washington - Health Secretary Kathleen Sebelius, who visited the US Centres for Disease Control and Prevention (CDC) in Atlanta, Georgia, on her first official trip outside Washington, said Tuesday there were more than 400 confirmed cases of swine flu in the US and "another 700 probable cases in 44 states."

"We know there will be more cases. The numbers will go up and unfortunately there are likely to be more hospitalizations and more deaths," she said.

CDC's official count was 403 cases in 38 states and one death. Most cases were in New York with 90, Illinois 82, California 49, Delaware 20 and Texas 41.

Tuesday's US count was 286 cases in 36 states.

In Geneva, the World Health Organization updated the number of global laboratory-confirmed cases of the H1N1 virus to 1,490 human infections in 21 countries.