Fortress - The Deep State series, #2

Delta Force operator Vann Jackson has brought something far deadlier than his guns back to the US embassy in Baghdad. He's carrying a gruesome virus, and when he launches a savage attack in the embassy chow hall, it doesn't take long before the infection spreads and things go to hell. As the death toll climbs faster than a Baghdad thermometer, desperate diplomats beg Washington DC for help, but Secretary of State Amy Coffman has other plans for the embassy.And they don't include saving her fellow Americans.
Abandoned by their political masters and cut off from the outside world, the survivors must fight their way out of the fortified compound before the growing army of infected can get to them. And before a ruthless cabal can implement their final, terrible solution.