The stars of the 2011 virus thriller Contagion - a prescient film these days - have reunited for a series of public service announcements to warn about COVID-19.Matt Damon, Laurence Fishburne, Kate Winslet and Jennifer Ehle have teamed up with scientists from Columbia University's Mailman School of Public Health to offer four individual homemade videos with advice and a message of unity.'Wash your hands like your life depends on it,' Winslet says in her PSA. 'Because right now, in particular, it just might.' Their messages: The stars of the 2011 virus thriller Contagion - a prescient film these days - have reunited for a series of public service announcements to warn about COVID-19.