This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
All of the following are true regarding Haemophilus influenzae except 
Select and explain. 
A. It can be a part of the normal flora in some persons, B. The serotyping is based on the bacterial outer membrane proteins, C. It requires Haemin and NAD for growth in culture medium, D. Type b is responsible for invasive disease
B: The serotyping is based on the bacterial outer membrane proteins
Answer: B: The serotyping is based on the bacterial outer membrane proteins 
Explanation: (B) The serotyping is based on the bacterial outer membrane proteins# Characteristics of Hemophilus influenzae: Hemophilus is a pleomorphic gram negative bacilli Hemophilus influenzae describes some of its properties Hemophilus means blood loving. This organism requires a blood containing medium for growth. Factor X and Factor V present in blood are essential for its growth (factor X acts physiologically as haemin and factor V is nicotinamide nucleotide) One important features of H. influenzae is that it does not grow properly on blood agar, because factor V is not available in blood agar as it is located inside red blood cells but when agar is heated to convert it into chocolate agar the factor V is released from R.B.C.'s> Hence H. influenzae grows better on chocolate agar> Antigenic structure: Encapsulated H. influenzae contains polysaccharide capsule. This polysaccharide capsule confers virulence Of these types of H. influenzae type b is commonly associated with invasive H. influenzae diseases such as Meningitis; Epiglottitis; Septic arthritis> Non capsulated strains of H. influenzae can colonize the upper respiratory tract of children and adults.> They lack the virulent invasiveness of encapsulated bacteria and can only cause local infection.