Which Microsporum species causes an epidemic form of tinea capitis in children?

Microsporum audouinii is the species primarily associated with epidemic tinea capitis, particularly in children. This fungus is capable of spreading rapidly in schools and communal settings, making it a significant cause of scalp infections in young populations. The infection results in symptoms such as hair loss and scaling of the scalp, often leading to significant discomfort and concern among parents and educators.

While other species, such as Microsporum canis and Microsporum gypseum, can cause tinea capitis as well, they are not typically linked to epidemics in the same way that Microsporum audouinii is. Microsporum canis is more often associated with infections transmitted from animals, and Microsporum gypseum is typically linked to geophilic infections. Therefore, when considering the context of epidemic outbreaks of tinea capitis in children, Microsporum audouinii stands out as the most relevant species.