weeksella virosa weeksella virosa weeksella virosa is a gram-negative and aerobic bacterium from the genus of weeksella which can cause infection in rare cases. weeksella virosa occurs in the human genitourinary tract. weeksella virosa scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: weeksellaceae genus: weeksella species: w. virosa binomial name weeksella virosaholmes et al. 1987