Finbar Sullivan, 21, was fatally stabbed at Primrose Hill in north London on Tuesday.
A man is charged over the deaths of two men and two women who drowned trying to cross the Channel on Thursday.
Vaccines were offered to thousands of people who may have been exposed, including university students and school pupils in the area.
UK government officials say they are not entirely abandoning the agreement but have run out of time.
Four people in a minibus were also taken to hospital, Leicestershire Police say.