(CNN) - In response to the growing number of swine flu cases in Mexico and the United States, White House spokesman Reid Cherlin said Saturday that the administration is taking the situation "seriously and monitoring for any developments."
A White House official says Obama has had no flu-like symptoms since his trip to Mexico in mid-April, and says there are no concerns about the president’s health.
On Saturday, the World Health Organization called "a public health emergency of international concern."
The most recent reports Saturday afternoon were of two confirmed cases of the virus in Kansas. Those joined eight confirmed cases in Texas and California and an apparent outbreak at a private school in New York City, where officials say eight children likely have the virus.
The WHO's Gregory Hartl said the strain of the virus seen in Mexico - which may have killed as many as 68 people there, according to that nation's health agency - is worrisome because it has mutated from older strains.