Richard Besser, acting director of the CDC, says, "I fully expect we will see deaths from this infection." More than two dozen new cases of swine flu are reported in the US and the virus spreads to additional states.
President Obama asks Congress for $1.5 billion to fight the swine flu outbreak, build drug stockpiles and monitor future cases. Obama says the money will also help international efforts to control the outbreak.
Cuba announces it is suspending flights to Mexico for 48 hours.
Hog prices nationwide drop to an average of about $59 per 100 pounds of carcass weight Tuesday morning, down from about $62 last Thursday, according to the U.S. Department of Agriculture. Prices typically climb past $70 in late April and May.
U.S. officials say they may abandon the term "swine flu," for fear it's confusing people into thinking they could catch it from pork. A better name for the virus, they say, is "H1N1." WHO indicates it had no plans to try to remove the term "swine" from the flu's name.
Canada joins list of countries advising against nonessential travel to Mexico.
WHO confirms 7 deaths in Mexico.
California Gov. Arnold Schwarzenegger declares a state of emergency to help deal with the outbreak.
Sen. Tom Harkin of Iowa, chairman of the Senate appropriations subcommittee that deals with pandemic preparedness, holds an emergency hearing to address funding for states and federal government. Other congressional committees follow suit and plan hearings for later in the week.
Among responses around the world, South Korea and Ukraine have temporarily banned all pork imports from North America in response to flu concerns. Russia, Hong Kong and Taiwan say they will quarantine visitors showing symptoms of the virus.
The U.S. State Department issues a travel alert, recommending Americans avoid nonessential travel to Mexico.
The number of confirmed U.S. cases more than doubles. President Obama says swine flu is cause for concern "but it's not a cause for alarm."
Twenty-eight of the 45 confirmed cases are in New York, all confined to students at St. Francis Preparatory School and their relatives. Several of the students had spent spring break in Cancun, Mexico.
Swine flu is now detected in nine countries. European Union's health commissioner warns Europeans to avoid nonessential travel to Mexico and the United States.
Mexico City is largely deserted due to an order to effectively shut the city down for the next 10 days.
Canada becomes third country to confirm human cases of swine flu.
The U.S. government declares a public health emergency, giving federal health officials authority to take rapid measures -- including authorizing contacts and mobilizing the national disaster system -- to respond to the disease, including allowing the use of unapproved drugs.
Officials confirm 20 Americans have been diagnosed with swine flu and expect more to follow. New York Mayor Michael Bloomberg confirms that eight students at St. Francis Prep are infected with the swine flu.
Besser confirms the virus found in Americans is the same as that in Mexicans.