By Jennifer Rigby LONDON (Reuters) – A handful of cases of monkeypox have now been reported or are suspected in the United Kingdom, Portugal and Spain. The outbreaks are raising alarm because the disease mostly occurs in west and central Africa, and only very occasionally spreads elsewhere. Here’s what scientists know so far. ‘HIGHLY UNUSUAL’ Monkeypox is a virus that causes fever symptoms as well as a distinctive bumpy rash. It is usually mild, although there are two main strains: the Congo strain, which is more severe – with up to 10% mortality – and the West African strain, which has a fata…