tokens: In rhesus monkeys , intravenous challenge with 0 . 6 x 10 ( 10 ) to 2 . 2 x 10 ( 10 ) Pseudomonas aeruginosa organisms caused acute illness of 4 to 5 days ' duration with spontaneous recovery in 13 of 15 monkeys ; blood cultures became negative 3 to 17 days after challenge .