ASCP Technologist in Microbiology (M) Practice Exam 2025 - Free Microbiology Practice Questions and Study Guide

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Which factors are required for Haemophilus influenzae to grow?

X and V factors

Haemophilus influenzae requires specific growth factors known as the X and V factors to thrive in culture media. The X factor is hemin, which is a derivative of hemoglobin, and is essential for the growth of this bacterium, providing it with the necessary iron. The V factor, on the other hand, is nicotinamide adenine dinucleotide (NAD), which plays a crucial role in cellular metabolism and energy production. Both factors are commonly supplied in enriched media, such as chocolate agar, which supports the growth of fastidious organisms like H. influenzae, allowing laboratory identification and study of this bacterium. The other options do not include the correct combination of these essential growth factors required by H. influenzae.

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A and C factors

V and K factors

X and Y factors

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