By Catarina Demony LISBON/MADRID (Reuters) -The health authority in Portugal, the country with the most monkeypox cases, said on Thursday it was worried about the spread of the disease but asked people to stay calm as the transmission risk was low. Portugal has reported 14 cases of monkeypox and there are around 20 suspected infections, the spokesperson for the country’s monkeypox working group, Margarida Tavares, told Reuters in a video interview. Monkeypox is a usually a mild viral illness, characterised by fever and a distinctive bumpy rash. The outbreaks in Britain, Portugal, Spain, the Un…