Cerebrumous Spattergroit

Cerebrumous Spattergroit was a particularly virulent sub-strain of the infectious fungus spattergroit. In addition to the regular symptoms of the disease, such as the formation of purple pustles on the skin, it caused severe confusion and memory loss.

A massive outbreak of Cerebrumous Spattergroit was one of several theories for why no one in the wizarding world had any memory of the 1877 Quidditch World Cup.

Appearances

 * Pottermore