LISBON (Reuters) -Portuguese authorities said on Wednesday they had identified five cases of the rare monkeypox infection, and Spain’s health services are testing 23 potential cases after Britain put Europe on alert for the virus. The five Portuguese patients, out of 20 suspected cases, are all stable. They are all men and they all live in the region of Lisbon and the Tagus Valley, the Portuguese health authorities said. European health authorities are monitoring any outbreak of the disease since Britain has reported its first case of monkeypox on May 7 and found six more in the country since …