A second possible British case of rabies is being investigated, disease control experts said.
The patient from Leeds sought medical attention following a dog bite which occurred abroad, the Health Protection Agency (HPA) said.
The HPA said the patient has "no links" to the confirmed case in London.
A spokeswoman said: "The HPA has been notified that a patient from Leeds has sought medical attention following a dog bite which occurred abroad. Investigations are under way to determine if the bite has led to an infection. There are no links to the rabies case confirmed recently in London."
The spokeswoman said that a number of people go through such tests every year.
The investigation comes two days after the HPA confirmed a case of the potentially fatal disease in a patient who had been bitten by a dog in South Asia.
The woman, believed to be a grandmother in her 50s, was reportedly turned away twice by doctors at Darent Valley Hospital in Dartford, Kent, before she was finally diagnosed.
Rabies is usually transferred through saliva from the bite of an infected animal, with dogs being the most common transmitter of rabies to humans. More than 55,000 people are estimated to die from the disease every year, with most cases occurring in developing countries, particularly South and South-East Asia.
The woman with rabies is now being treated at London's Hospital for Tropical Diseases, which has reassured patients, visitors and staff there is no risk to them as a result of the case.
Dr Brian McCloskey, director of the HPA for London, said: "It is important to stress that there is no risk to the general public as a result of this case or to patients and visitors at the hospital where the patient is receiving treatment. Despite there being tens of thousands of rabies cases each year worldwide, there have been no documented laboratory confirmed cases of human-to-human spread."