There are 3 books in the The Infected series. The newest book is Pandemic which came out in 2014.

1
Infected

Book cover of Infected

Scott Sigler is the voice in modern horror - and the INFECTED trilogy is a terrifying, menacing series that will leave you sleepless.

The alien intelligence that unleashed two horrific assaults on humanity has been destroyed. But before it was brought down in flames, it launched one last payload -…

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2
Contagious

Book cover of Contagious
From the acclaimed author of Infected comes an epic and exhilarating story of humanity’s secret battle against a horrific enemy.

Across America, a mysterious pathogen transforms ordinary people into raging killers, psychopaths driven by a terrifying, alien agenda. The human race fights back, yet after every battle the disease responds,…

3
Pandemic

Book cover of Pandemic
In the final book in the Infected trilogy, the entire human race balances on the razor’s edge of annihilation, beset by an enemy that turns our own bodies against us, that changes normal people into psychopaths or transforms them into nightmares.

To some, Doctor Margaret Montoya is a hero—a brilliant…