The action followed clashes between demonstrators and police on U.S. campuses and a blockade at Paris's Sciences Po university
Infections have been reported by 194 countries outside China.
The death toll from an outbreak of coronavirus in Italy rose by 602 on Monday, the smallest increase for four days, while the number of new cases also slowed.
Spain has nearly 4,000 health workers infected, more than one in 10 of total confirmed cases.
Several more US governors joined the procession of states ordering millions of Americans to stay at home to slow the spread of the coronavirus, while President Trump signalled he's considering a move in the opposite direction.