Beijing ordered airport and railway stations to tighten health checks on travelers.
The World Health Organization says it wants samples from China's suspected SARS case sent to labs overseas for testing because local tests have been inconclusive.
Meanwhile, health departments throughout China stepped up anti-SARS measures Sunday, a day after authorities announced the nation's first suspected case of the disease since July.
The city of Beijing has ordered airport and railway stations to tighten health checks on travelers and to send anyone with a high fever to a government-designated hospital.