tumebacillus avium tumebacillus avium tumebacillus avium is a species of gram positive, facultatively aerobic, bacterium. the cells are rod-shaped, motile, and form spores. it was first isolated from faecal sample of a cinereous vulture (aegypius monachus) from the seoul grand park zoo, seoul, south korea. the species was first described in 2018, and the name is derived from latin avium (of the birds). tumebacillus avium scientific classification domain: bacteria division: bacillota class: bacilli order: bacillales family: alicyclobacillaceae genus: tumebacillus species: t. avium binomial name tumebacillus aviumsung et al. 2018 the optimum growth temperature for t. avium is 25-30 °c, and can grow in the 4-37 °c range. its optimum ph is 7.0, and grows in ph range 6.0-9.0. the bacterium forms white colonies on r2a agar.