Abstract
The prevalence of infectious bronchitis (IB) of chickens in many parts of the world (2,3,4,5,6,7,10,12,13,14,15,21,22,23,25), and the invasiveness of its virus (11), indicate that this generally mild disease may be important when associated with other poultry pathogens. Synergism between IB virus (IBV) and Mycoplasma gallisepticum (1) and between IBV and Haemophilus gallinarum has been reported (16). Interference, however, was observed between IBV and Newcastle disease virus (8,9,17). A search of the available literature did not disclose any studies concerning the responses of chickens to the combined action of IBV and infectious laryngotracheitis virus (LTV). LTV was chosen as the combining pathogen mainly because, in addition to its pneumotropism (also characteristic of IBV), it has a necrotizing effect on the tracheal mucosa (24). The purposes of the experiment were: 1) to evaluate the reactions of chickens inoculated with the 2 agents in relation to the reactions of chickens inoculated singly with either one of the viruses; and 2) to explore the possibility that susceptible birds simultaneously exposed to the 2 viruses may develop satisfactory immunity against both.
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