aggressin
noun
ag·gres·sin
ə-ˈgres-ᵊn 
: a hypothetical substance held to contribute to the virulence of pathogenic bacteria by paralyzing the host defensive mechanisms (as the white blood cells) and held to be produced by the bacteria in the body of the host
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“Aggressin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/aggressin. Accessed 22 Dec. 2024.
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