[1] It is the sequel to Sigler's Infected, and like its predecessor was released in both podcast and print versions.

[2] Perry Dawsey and Margaret Montoya attempt to stop an alien infestation of "hatchlings".

Dawsey, former Michigan linebacker, has survived the events in Infected, but remains telepathically linked to the aliens.

Critical reception for Contagious was mostly positive, with author J. C. Hutchins writing that the book "stayed on target, accelerated, and exceeded my expectations".

[3] TOR.com also praised the book, stating that it was "gripping, horrifying, and manages to tie several separate plot threads together effortlessly" while criticizing the portrayal of some of the characters.