By cnn senior medical correspondent Elizabeth Cohen. We now have these four cases that are not travel related. I wonder we also know theyve not been in contact with anyone who has the virus. Is this now just kind of freely spreading through communities . Its actually called Community Spread and thats exactly whats going on here. Once youre finding patients who are getting coronavirus and they didnt travel to china or any other coronavirus hot spot and they dont know anyone who did, they just got it from somewhere. Infectious disease experts have told me we need to start thinking about this like the flu. When you get the flu you dont necessarily know who gave it to you. Oh, my husband got the flu and i got it. Sometimes you just get it because its just out there. And now that we have more tests available, which was not the case even days ago, well see more of this. So when we think of the flu in your perspective here, we think of kids being most vulnerable. Its kind of the opposite with