i'm stefan holtz. >> and i'm natalie pasquarella. the message on long island tonight is the mumps vaccine might not be enough to keep them at bay. >> there are 18 cases. most of those in the community of long beach. greg cergol spoke with a doctor. he's in long beach with what you need to know about this. greg? >> reporter: stefan and natalie, health officials are reporting four confirmed cases and 14 suspected cases of mumps. some of themer here at this long beach emergency department. health officials are blaming this outbreak on what seems to be a changing mumps virus. now health officials say most of the cases have been reported right here in long beach. the patients all in their 20s. most have already received the mumps vaccine, but they still got sick because in some cases the virus appears to have mutated slightly, making the doctors say because as we get older the vaccine's strength can diminish. despite the concerns about the mutating virus, though, doctors are still urging those who have been exposed to mumps to consider ge