Bordatella infection: (noun) A genus of gram-negative bacteria. The species Bordatella avium causes the avian disease bordetellosis, which causes lockjaw in cockatiel chicks. This highly contagious disease can cause death in cockatiel chicks if treatment is not started quickly after symptoms occur. Symptoms for cockatiel chicks include lethargy,runny nose, eyes and respiratory signs. The severity of the avian disease varies with different bird species. Other Bordatella species are also the most common cause of kennel cough (Bordatella bronchiseptica) in dogs and whooping cough (B. pertussis) in humans.