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. 1996 Nov;64(11):4534–4541. doi: 10.1128/iai.64.11.4534-4541.1996

Immune responses and resistance to brucellosis in mice vaccinated orally with Brucella abortus RB51.

M G Stevens 1, S C Olsen 1, M V Palmer 1, G W Pugh Jr 1
PMCID: PMC174409  PMID: 8890203

Abstract

Immune responses and resistance to infection with Brucella abortus 2308 (S2308) were measured in mice following oral or intraperitoneal (i.p.) vaccination with strain RB51 (SRB51). Bacteria persisted in the parotid lymph node for 4 weeks following oral vaccination of mice with 5 x 10(8) or 5 x 10(6) CFU of SRB51. Bacteria did not appear in the spleen during 12 weeks after oral vaccination, whereas they did appear in the spleen for 8 weeks following i.p. vaccination of mice with SRB51 (5 x 10(8) or 5 x 10(6) CFU). Increased resistance to S2308 infection occurred at 12 to 20 weeks in mice vaccinated i.p. with SRB51 (5 x 10(8) or 5 x 10(6) CFU) but occurred at 12 weeks only in mice vaccinated orally with SRB51 (5 x 10(8) CFU). Oral SRB51 vaccination induced lower levels of antibodies to the surface antigens of intact SRB51 bacteria than did i.p. vaccination. However, neither route of vaccination induced anamnestic antibody responses to the surface antigens of intact S2308 bacteria after challenge infection of the vaccinated mice with S2308. Mice vaccinated orally with SRB51 and challenged with S2308 at 12 to 20 weeks had lower and less persistent spleen cell proliferation and production of gamma interferon in response to S2308 and certain immunodominant S2308 proteins (32 to < or = 18 kDa) than did mice vaccinated i.p. with SRB51. However, mice vaccinated orally or i.p. with SRB51 and challenged with S2308 had similar spleen cell tumor necrosis factor alpha production. These results indicate that oral vaccination of mice with SRB51 was effective in inducing protective immunity to S2308 infection, although the immunity was lower and less persistent than that induced by i.p. vaccination. The lower protective immunity induced by oral vaccination may have resulted from lower and less persistent cell-mediated immunity and gamma interferon production in response to S2308 and S2308 proteins.

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Selected References

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