More US states are taking action to prevent the spread of Covid 19. 

The governor of New York state is using the national guard to set up a containment zone. It's happening in the city of New Rochelle. 

That's one of the epicenters of the virus in that state. 

In addition a number of colleges are reducing classes or shutting down altogether including Harvard and Stanford universities. 

CGTN's Sarah Walton reports.