aggressin
/əˈɡrɛsɪn/(also aggressine, agressin) Microbiology
noun
Any of various products or components of microorganisms that increase virulence, especially by causing inhibition or evasion of the host's defences.
Origin
Early 20th century; earliest use found in American Medicine. From German Aggressin from aggress- (in Aggression, aggressiv, etc.) + -in.