patch in march, but the virus hit networks that had not updated their systems, which microsoft stressed the importance of in a statement sunday but also said this attack is a wake-up call for governments. all right, folks, so, what do you do this morning to keep yourself safe? let's bring in samuel burke live in london for us. samuel, we know more cases already this morning. how do americans protect right ? >> reporter: well, if you want to know what's going to happen in america this morning, look at china, which has already had their monday morning 40,000 infections there. remember, this story broke on friday in the u.s., and china already at home enjoying their weekend. now they're going back to work and seeing all these infections. plus, we're seeing new strands of this virus, maybe the group of cyber criminals that did this has altered the code, maybe there are copycats now wanting to cash in. but at the end of the day, all you need to do to update your computer to keep safe from this is just make sure you have that latest windows update, that annoying pop-up in the right-hand corner that says restart your computer. if you've done that since march,