Haemophilus influenzae is a gram negative coccobacilli that grows on Chocolate Agar! (Yumm? Not really :p) but If you are aiming to become a pediatritian know that you will facing it a lot causing in your little patients Otitis Media. However, this facultative anaerobe is part of our normal flora. And as a gram negative it has pili and lipopolysaccharide molecules as virulence factors, But its most important virulence factor is its Capsule!! It can cause various diseases including pneumonia, bronchitis, sinusitis, epiglottitis, as well as meningitis and others. Usually we treat with Third Generation Cephalosporins ;)