The CDC is not advising against traveling to China, but travelers who go there should refrain from touching birds and other animals and wash their hands often.
There is currently no incidence of the virus in the United States, but the most likely scenario for it to get there would be through a person traveling from China.
The risk to persons in the United States is low, the CDC said.
There are no tests available at pharmacies or doctors' offices to distinguish this flu quickly from any other flu virus, the CDC said. However, there is a sophisticated test to detect the H7N9 virus in particular, which takes at least four hours.
"Anyone with fever, coughing or shortness of breath within 10 days of traveling to China should see a doctor and tell the doctor about the recent travel to China," the CDC said on its website.