This is going to be a continuation of the last posts "Tips for infected" for L4D1. Boomer, Smoker, Hunter, and Tank strategies remain mostly the same. Note that some of the strategies for these infecteds may be out of date to buffs/nerfs.

Boomers: It SEEMS that the boomer range has been nerfed. This means that both the puke AND explosion seems to have less range (someone do some research/test to confirm please.) Aiming higher increases range, so aim somewhere above the target's head. Ambush is a must. Never FOLLOW a group of players or approach from far away. Easy way of approach is to jump down on a group of survivors (be aware that it's easy to shoot you while you're dropping, so try to drop from low places). Female boomer and male boomer noises are different.

Smoker: Everything seems to be the same. Tongue strength seems to be nerfed.

Hunter: YOU ARE HEAVIER!!! Air control has been nerfed, so you no longer have as much control in the air as you did previously. The hunter is heavier so you won't go as far as in the first game. Adjustments are needed.

Tank: Same as last game. Note that you can punch multiple things with one punch.

-------------now for the new infecteds-------------

Jockey:
You don't do much damage, you are very situational, you die easily. Probably the worst special infected yet. Your leap does not go very far and has a recharge time long enough to get you killed. Try to leap BEFORE you are in a survivor's face, so there is less chance of getting meleed. Your giggling noise IS CONSTANT, you are a pretty loud target to hear. However, the jockey can easily blend in with a horde due to his size, so use it to your advantage. Jumping into a full group of survivors is suicide and will achieve nothing. It's best to attempt to walk a survivor into the fire, off a ledge, or into other damaging/time consuming places. Your other main task is to separate survivors, so use any openings (3 boomed, distracted, etc) to do so.

Spitter: You are probably the strongest infected! Key here is to stand on high ground and rain death from above. Use your spit right when someone is getting beat in the middle of a horde or helping another up. DO NOT*** spit on a downed survivor if s/he has next to full health; it will not kill him and any damage done will go to waste. A red crosshair implies that the spit will hit the wall/ground. Do not try to snipe the survivors unless if you're sure it will hit them. Note that you leave a small puddle where you die. You'll be good to go as soon as you are experienced with the spit's range and drop.

Charger: The toughest special infected (aside from the tank). You run very fast and can take many bullets before dying. Your punches do 10 damage each and charge for 10 damage on hit. Your smashes to the ground do 15 damage each, although some what slow. In other words: your attacks can HURT! note that the slowness of the smashing should discourage you from charging into a full group of survivors (you will probably die before even getting one pound in). You cannot control the charger while he is charging, and crashing into the wall gives a pretty big recoil. Charge only when you're sure you will hit, and preferably not from far away (unless if the survivor is not in a moving condition and/or is distracted). Missing a charge renders you next to useless due to the length of the recharge. If you miss a charge in any case, run in circles around the survivor(s) and right click to punch (10 damage each!). Note that charging one off a ledge is INSTANT DEATH, use this in every possible case.