To fight the epidemic, the Obama administration is asking Congress for $1.5 billion. White House press secretary Gibbs said the president was requesting the funds "out of an abundance of caution" to "enhance our nation's capability to respond to the potential spread of this outbreak."
The CDC has become the center for the swine flu investigation. It is one of only four laboratories in the world that have the expertise to unravel a novel flu strain.
"What we're trying to do is to identify how bad, how good, the swine flu is currently operating -- is it expanding, is it contracting, is it maintaining a steady state," said Phillip Navin, director of the Division of Emergency Operations at the CDC.
With the uptick in cases, the CDC shipped more antivirals and sent additional teams into the field.
"I think at the moment we need to be looking forward and making sure that we're doing everything that we can to keep people from getting sick," said Dr. Steve Reed, director of the CDC's Influenza Coordination Unit.
Mexico, the country worst hit by swine flu, has taken dramatic action over the last few days in attempting to contain the virus. While authorities hunt for the source of the swine flu outbreak, the country is under lockdown. It has taken the drastic step of ordering a suspension of all nonessential federal government and private business activity.
In a televised address, President Calderon praised "the heroic work" of doctors and nurses and asked his countrymen to literally stay in their homes between May 1 and May 5, saying, "there is no safer place to protect yourself against catching swine flu han in your house."
"In recent days, Mexico has faced one of the most serious problems in recent years," Calderon said Wednesday night. He brushed aside criticisms that his government's response had been slow, emphasizing several times that authorities had reacted "immediately."
But with the flu spreading quickly in the United States and across the globe, the actions of Mexican health officials are under the microscope. Many health experts question whether the government has done enough to contain the flu.
Oscar Barrera, who was diagnosed with the flu Monday and prescribed Tamiflu, said he was sent home by medical officials and simply told to keep away from other people.
Barrera claimed that health officials did not test his pregnant wife and three-year-old son, or anyone in the cell phone shop where he worked, for the flu.
"What worries me most is if the officials don't do enough to protect my family," Barrera told ABC News.
According to Mexico's health ministry, there now have been 12 confirmed deaths of the swine flu in Mexico, but roughly 176 deaths are suspected of having been caused by the virus. There are nearly 3,000 suspected cases.
Schools, museums, parks and churches in Mexico City have been shut down by the government. A leading business group estimated that canceled events and closure of establishments to prevent the spread of swine flu is costing Mexico City at least $57 million a day.
All of Mexico's Mayan ruins and Aztec pyramids have also been shut down until further notice.
Mexican officials are hoping the 10-day shutdown will be enough to cover the two-day incubation period and the seven-day recovery of anyone who has the virus.