The UK Health Security Agency (UKHSA) urges families to check their vaccination status, particularly for the MMR vaccine, before travelling.
Declining childhood vaccination rates in England are increasing the risk of measles, a highly infectious disease that can lead to serious complications.
Recent UKHSA figures show 109 measles cases in England in April and 86 in May, with half of the cases in the last four weeks being in London.
The World Health Organisation (WHO) reports Romania, Pakistan, India, Thailand, Indonesia, and Nigeria have the highest measles cases globally.