H.parainfluenzae requires which of the following factors: (A) Only Factor X, (B) Only Factor V, (C) Both factor X and V, (D) None of the above
Answer is A. H.influenzae, H.haemolyticus, and H.aegyptius: requires both factor X and VH.parainfluenzae, H.parahaemolyticus, and H.paraphrophilus: Requires only factor VH.aphrophilus: Doesn't require both factors(Ref: Ananthanarayan 9th edition, p328)