pfizer announcing it is now ready, that they have met the requirements, they say, to now ask for emergency use authorization for its vaccine? >> reporter: it's an important milestone, david. pfizer now announcing that it has all the necessary safety data to begin that application for emergency use from the fda. it says it could even file that application in a number of days. now, the fda says it might need about two to four weeks to actually get that approval in the can. now, pfizer has been working on its distribution plan, it's got a pilot program with four states across the country. and the company says as soon as it gets that approval, it could begin shipping out those precious vials that very night. david? >> there is some hope ahead of us. matt, thank you. and of course, those images today, long lines for testing in so many states. and now empty shelves at some grocery stores in this country. in fact, some supermarkets are now placing limits on just how much you can buy again. abc's stephanie ramos on that part of the story. >> reporter: tonight, covid testing lines growing as people from coast to coast scramble to