Annihilation by K. D. McAdams

Statistically speaking 100% of the population was wiped out, how did Seamus survive?

There is a vaccine for the virus ravaging the planet, it's across the country, with his mother.
Will Seamus survive the journey?

Teen genius Seamus Robinson and his family have survived the fast moving virus that is killing off the human race. If they are going to live much longer they need to get from their home in New Hampshire to California where his mother has the vaccine and a secret. Brains will be as important as brawn if they are to survive a post-apocalyptic road trip through raging wild fires and outlaw controlled highways.

“Loved it from start to finish. Very fast paced and I enjoyed getting to know the characters. Glad it wasn't scary, more of an interesting thriller.” – Amazon reviewer