Uploaded January 2009 | Updated September 2026, 5 hours ago
The Boomer is an extremely bloated Special Infected, which seems to have been filled with an odorous slime. They are able to projectile vomit this bile, and if it hits the Survivors, it covers them, temporarily blinding them and attracting the Horde. When the boomer dies, it explodes and discharges large amounts of gore and viscera, which will also attract the Common Infected if an unfortunate Survivor is caught in the blast.
The Boomer has been heavily mutated by this strain of the infection. It has become extremely bloated to the point that a slight rupture in its flesh will cause it to explode in a bloody, bile-filled explosion. It is unknown whether it was the result of the infection of an incredibly obese individual or the result of a strange strain of the infection. Massive growths have appeared along its skin, indicating that it may still be expanding. It has developed the ability to vomit from great distances, and its bile has developed the unique characteristic of attracting all nearby infected in the surrounding area, possibly through smell. Though its mentality is similar to that of the typical infected, it not distracted by such things as the flashing lights of pipe bombs nor is it apparently attracted by such things as car alarms going off.
Source: Left 4 Dead Wiki
The Boomer is an extremely bloated Special Infected, which seems to have been filled with an odorous slime. They are able to projectile vomit this bile, and if it hits the Survivors, it covers them, temporarily blinding them and attracting the Horde. When the boomer dies, it explodes and discharges large amounts of gore and viscera, which will also attract the Common Infected if an unfortunate Survivor is caught in the blast.
The Boomer has been heavily mutated by this strain of the infection. It has become extremely bloated to the point that a slight rupture in its flesh will cause it to explode in a bloody, bile-filled explosion. It is unknown whether it was the result of the infection of an incredibly obese individual or the result of a strange strain of the infection. Massive growths have appeared along its skin, indicating that it may still be expanding. It has developed the ability to vomit from great distances, and its bile has developed the unique characteristic of attracting all nearby infected in the surrounding area, possibly through smell. Though its mentality is similar to that of the typical infected, it not distracted by such things as the flashing lights of pipe bombs nor is it apparently attracted by such things as car alarms going off.
Source: Left 4 Dead Wiki
![Left 4 Dead - Francis [Crash Course]](https://i.ytimg.com/vi/pL-jMV_Kbgk/mqdefault.jpg "Left 4 Dead - Francis [Crash Course]
The voices for Francis in the new DLC update.
Louis: http://www.youtube.com/watch?v=UGaMvx0a8qQ
Zoey: http://www.youtube.com/watch?v=7C3mS14k54c")
