Obama added that "out of an abundance of caution," he has asked Congress for $1.5 billion to be set aside for more medicines, supplies and the development of an H1N1 flu vaccine.
Officials continue to caution those who feel ill to stay home, for individuals to wash their hands frequently and for schools with a confirmed case of the virus to close for up to 14 days, with frequent reevaluation of their particular situation.
Schools are of particular concern, the CDC's Dr. Anne Schuchat said Saturday, because children take longer to shed viruses and other diseases, and often do so without symptoms. The majority of the swine flu cases in the United States have occurred in people younger than 20 years old. The median age of those with the disease is 17, though the ages range from 1 to 81, according to Schuchat.
"The goal" of social distancing efforts like school closures, Schuchat said, "is to try to decrease the ongoing numbers of cases and to shift them to a later time by slowing transmission."
Religious organizations altered their weekend services to reduce close contact between congregants. Some made the decision not to place communion wafers into individuals' mouths or to serve wine, an attempt to limit the risk for transmission of the disease.
ABC News' Gregory Croft, Ayana Harry and wire reports contributed to this report.