Preliminary data on efficacy of Mycoplasma gallisepticum vaccines containing different adjuvants in laying hens.
Chickens were vaccinated subcutaneously twice, at 13 and 17 weeks of age. The vaccines used were the whole organisms of Mycoplasma gallisepticum (MG) adjuvanted with multilamellar positively charged (MPC) liposomes or oil-emulsion. Other chickens received the same bacterins but supplemented with Salmonella typhimurium cell wall protein mitogen (STP) (50 micrograms/dose). At 21 weeks of age, each bird was challenged in the right and left caudal thoracic air sacs. The challenge dose/chicken was 1.3 x 10(5) CFU of MG (R-strain). A significant immunoglobulin (Ig) response specific to MG was observed in sera of chickens collected 3 weeks after the first and second vaccination with MG adjuvanted with MPC liposomes or oil-emulsion. The same two treatments had highly significant MG-titers in eggs collected during the first and second month post challenge. Both groups had highly significant protection (P less than 0.05) against MG transmission in eggs layed during the first month post challenge. Vaccination with MG organisms adjuvanted to MPC liposomes or oil-emulsion resulted in higher egg production, during the first month following challenge, in comparison to the unvaccinated-challenged birds; the same two groups had higher egg production in the second month following challenge compared to unvaccinated-challenged birds, but not significantly different (P greater than 0.05). The addition of STP to bacterins containing MG organisms adjuvanted to MPC liposomes or oil-emulsion, resulted in a significant reduction (P less than 0.05) of the Ig-specific to MG in sera and in a significant drop in egg production (P less than 0.05) during the first month following challenge.
Barbour
E K
EK
Department of Veterinary Pathobiology, School of Veterinary Medicine, University of Minnesota, St. Paul 55108.
Newman
J A
JA
D000276:Adjuvants, Immunologic / Q000008:administration & dosage*; D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis / Q000276:immunology; D001425:Bacterial Outer Membrane Proteins / Q000008:administration & dosage; D001428:Bacterial Vaccines / Q000008:administration & dosage* / Q000276:immunology; D002645:Chickens; D004530:Egg Yolk / Q000032:analysis; D004531:Eggs / Q000032:analysis; D004655:Emulsions; D006385:Hemagglutination Inhibition Tests; D007074:Immunoglobulin G / Q000032:analysis; D008081:Liposomes; D009174:Mycoplasma / Q000302:isolation & purification; D009175:Mycoplasma Infections / Q000276:immunology / Q000517:prevention & control / Q000662:veterinary*; D009821:Oils; D011201:Poultry Diseases / Q000276:immunology / Q000517:prevention & control*; D012486:Salmonella typhimurium / Q000276:immunology
D000276:Adjuvants, Immunologic; D000907:Antibodies, Bacterial; D001425:Bacterial Outer Membrane Proteins; D001428:Bacterial Vaccines; D004655:Emulsions; D007074:Immunoglobulin G; D008081:Liposomes; D009821:Oils