Do you know the title of this book?!

[Snowbeau]

I read it when I was year 9/10 maybe. It was a fiction book about the black plague. Two teenagers survived whilst everyone else was unwell and they went on an adventure to try and survive.

Does anyone know what book I'm talking about?!

Plague 99, Jean Ure.

Historical or set in modern times?

I think it might be plague 99, although I remember the main characters being a male and female.
I'm sure it was set in modern day.

Was it Astercote by Penelope Lively ?

The more I read it the more it sounds like plague 99. Thank you!

There are a couple of sequals, might be one of those?

Plague 99 was written in 1989 and set in 'the future' of 1999. The characters are 2 girls Fran and Harry (Harriet) and a boy whose name I can't remember (he is Asian) There are two sequels - Come Lucky April which was re printed as After the Plague, and Watchers at the Shrine.
One of my favourite trilogies.

I think modern editions might have dropped the '99' and it's just published as 'Plague'.

Definitely not Z for Zachariah?

How I live Now - Meg Rosoff ??