What species of Haemophilus hemolyzes horse erythrocytes and requires hemin and NAD for growth?

The species that hemolyzes horse erythrocytes and requires hemin and NAD for growth is Haemophilus haemolyticus. This organism is characterized by its ability to lyse red blood cells, which is an important trait for identification in laboratory settings. Additionally, it has specific growth requirements; hemin (also known as factor X) and NAD (factor V) are essential for its cultivation in vitro.

Haemophilus haemolyticus is often found in normal flora but can be associated with opportunistic infections, particularly in cases involving immunocompromised individuals.

The other species listed do not share the same hemolytic activity towards horse erythrocytes or do not have the same growth factors required as H. haemolyticus. Understanding these specific growth characteristics and hemolytic activity is crucial for microbiologists when isolating and identifying bacteria within the Haemophilus genus.