I remember watching a movie on television in the late 70's about a family who went on vacation or some type of trip and people were dying - no one was found alive. A specific scene I remember was a station wagon and they came upon dead people and wherever they went, everyone was found dead. Does this sound familiar? It wasn't a "movie" at the shows but on T.V. I'd appreciate any help or suggestions. Thanks.

Could be Where Have All the People Gone (http://www.imdb.com/title/tt0072400/).

The andromeda strain?