In vitro and in vivo characterization of avian Escherichia coli. III. Immunization.
Broiler breeder hens were vaccinated once at 20 weeks or twice at 20 and 25 weeks of age with a formalin-inactivated oil-emulsion Escherichia coli bacterin composed of serogroups O2, O78, and O35. Serological responses as assessed by microagglutination documented an increase in serotype-specific antibody in vaccinated birds. Challenge of progeny from vaccinates and nonvaccinates with homologous E. coli demonstrated that maternally derived antibody could protect against mortality and/or lesions for as long as 2 weeks post-hatching.
D000372:Agglutination Tests; D000818:Animals; D002645:Chickens; D004926:Escherichia coli / Q000145:classification; D004927:Escherichia coli Infections / Q000276:immunology / Q000662:veterinary*; D005260:Female; D007114:Immunization; D008297:Male; D011201:Poultry Diseases / Q000276:immunology*; D012703:Serotyping; D013997:Time Factors; D014612:Vaccines / Q000008:administration & dosage
D014612:Vaccines