CXCL8 and infection: Infection with T. forsythia UB4 (Leg) dampens the IL-1β response in monocytes when compared to the T. forsythia ATCC 43037-type strain (Pse), but contrary to the latter strongly induces IL-7, which had not been observed in response to the species before; in HOK challenged with either wild-type, T. forsythia UB4 elicits a higher IL-8 release [22].