<prompt> Ideal percentage of CO2 required for growth of Brucella abous ?2-55-1015-2025-30  <response>: Ans. is. b. i.e., 5-10 Addition of 5-10 CO, improves the growth of B abous and B. melitensis.All Brucella spp. are strictly aerobic, but some B. abous biovars, some Brucella isolates from marine mammals, and B. ovis only grow in atmospheres containing 5-10 CO,. 