Germany has become the seventh European country to confirm a case of monkeypox.
Meanwhile in the UK, the number of identified cases has more than doubled in the past two days.
The disease, which has existed in humans in West Africa since the 1970s, causes mild illness and bumps on the skin.
Dr Graham Fry of Travel Health Clinics says it can be treated similarly to chicken pox:
"There is no specific treatment. You treat the symptoms rather than the actual disease itself. It should settle of its own accord. Generally it's quite a mild disease, and like any viral disease, it can become very severe obviously, but generally it cures itself over a short period of time, and most patients aren't that very sick with the condition".