title: Lymphoid organ and serologic responses of gnotobiotic and conventional chickens to infectious bronchitis virus and mixed infections of Mycoplasma synoviae and Escherichia coli.
mesh_terms: D000818:Animals; D001835:Body Weight; D001990:Bronchiolitis, Viral / Q000276:immunology*; D002060:Bursa of Fabricius / Q000033:anatomy & histology; D002645:Chickens; D004926:Escherichia coli / Q000276:immunology; D005856:Germ-Free Life; D006385:Hemagglutination Inhibition Tests; D008214:Lymphocytes / Q000166:cytology; D008221:Lymphoid Tissue / Q000276:immunology*; D009174:Mycoplasma / Q000276:immunology; D009500:Neutralization Tests; D009929:Organ Size; D013950:Thymus Gland / Q000033:anatomy & histology