The HPA has announced that another member of the same family has caught the disease and was being treated in isolation. The patient was said to be recovering.
Four out of the 12 confirmed global coronavirus cases have been diagnosed in Britain.
Prof John Watson, head of the respiratory diseases department of the HPA, said: "Although this patient had a mild form of respiratory illness, as a precaution the HPA is advising that the patient self-isolate and limit contact with non-household members.
"Follow-up of other household members and contacts of this case is under way.
"Although this case appears to be due to person-to-person transmission, the risk of infection in contacts in most circumstances is still considered to be low. http://www.ibtimes.co.uk/articles/435849/20130215/third-case-deadly-sars-virus-confirmed-hpa.htm
