Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: The chief medical officers from NI and the Republic of Ireland have advised against all but necessary travel across the NI-Donegal border.

Coronavirus: 'Avoid all but necessary travel across NI-Donegal border'