Help! Does anyone remember this book?

[pinkmama]

Hi, this has been driving me mad for years now. In English Lit at school, so must have been early to mid 80s, we read a book about a boy (I think) who was one of the. few survivors of a virus that had attacked the population. I remember it having a cover that was the sky and clouds with a door in it. Of course I could have made all that up and confused it with something else. The book made a lasting impression on me, although obviously not its title or author

Someone please put me out of my misery!

Thanks

[alibubbles]

Is it this one?
Empty World

[dyzzidi]

was it z for zachariah?

[pinkmama]

Hurrah - yes, its empty world. Thank you very much x