The U.S. Centers for Disease Control has again lifted its travel alert for Toronto, giving the city another all-clear sign in its fight against SARS.

The CDC announced the lifting of its travel ban late Tuesday -- 30 days since the last date of onset of severe acute respiratory syndrome (SARS) in Toronto -- setting a green light for Americans to resume travel to Canada's largest city.

Unlike the World Health Organization, the CDC never issued a travel advisory urging Americans to defer non-essential plans to visit to Toronto.

Instead, they used a less-restrictive travel alert, which simply warned U.S. citizens visiting Toronto to avoid high-risk settings such as hospitals and to monitor their health after leaving the city.

The first travel alert was issued by the CDC April 23, during Toronto's first SARS outbreak. Less than a month later it was removed, when it appeared SARS was under control on May 20.

But three days later, when Health Canada reported the discovery of a second hospital-based SARS cluster in Toronto, the CDC renewed its advisory.

Although the CDC is not currently recommending any SARS-specific precautions for travelers to Toronto, the agency is advising travelers to remain wary of the disease.

"Travelers should be aware of the SARS outbreak and stay informed about the current travel alerts to areas where cases of SARS were reported," the CDC said in a statement.

On Saturday, the World Health Organization scratched the last place, Taiwan, off its worldwide list of SARS hotspots, declaring the disease under control worldwide.

SARS is believed to have infected at least 8,400 people and killed 812 -- mostly in Asia, but also in Africa and Canada -- since it surfaced early late last year.

With a report from The Canadian Press