There are 2 books in the Contagion series. The newest book is Immunity which came out in 2019.

1
Contagion

Book cover of Contagion

Edgar Award Nominee for Best Young Adult Mystery

Perfect for fans of Madeleine Roux, Jonathan Maberry, and horror films like 28 Days Later and Resident Evil, this pulse-pounding, hair-raising, utterly terrifying novel is the first in a duology from the critically acclaimed author of the Taken trilogy.

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2
Immunity

Book cover of Immunity

Survivors of a deadly planetary outbreak take on a new, sinister adversary in the white-knuckle sequel to Contagion, which New York Times bestselling author Amie Kaufman called “gripping, thrilling, and terrifying in equal measures.”

Thea, Coen, and Nova have escaped from Achlys, only to find themselves imprisoned on a ship…