Part A: Haemophilus influenzae requires hemin (X factor) to synthesize cytochrom

Part A: Haemophilus influenzae requires hemin (X factor) to synthesize cytochromes and NAD+ (V factor) from other cells. For what does it use these two growth factors? What diseases does H. influenzae cause?
Part B: Why is the prevention of biofilms important in a healthcare environment? Name an example of a biofilm-related infection and some possible strategies for prevention.