• Vaccine Name: C. jejuni PorA protein vaccine
• Target Pathogen: Campylobacter jejuni
• Target Disease: Campylobacterosis
• Vaccine Ontology ID: VO_0004203
• Type: Subunit vaccine
• Status: Research
• Antigen: Recombinant PorA protein
• PorA gene engineering:
  • Type: Recombinant protein preparation
  • Description:
  • Detailed Gene Information: Click Here.
• Adjuvant:
  • Adjuvant name:
  • VO adjuvant ID: VO_0001272
• Immunization Route: orally

Mouse Response

• Host Strain: BALB/c
• Vaccination Protocol: BALB/c mice were orally vaccinated twice at a weekly interval with the purified GST-PorA fusion protein combined with a modified heat-labile enterotoxin of Escherichia coli toxin, LT R192G, as an adjuvant. Mice immunized with LT R192G or PBS (pH 7.2) alone were included as controls. Vaccination was done by using a stainless steel, curved-ball-tip feeding needle (20 gauge, 1.5-in. long; Popper and Sons, Inc., New Hyde Park, NY). Just prior to vaccination, gastric acidity was neutralized with two doses (0.5 ml each) of a 5% sodium bicarbonate (pH 8.5) solution given as an oral gavage at an interval of 15 min. An amount of 300 µg of the GST-PorA fusion protein mixed with 5 µg of LT R192G in a total volume of 300 µl in PBS (pH 7.2) was given to each of nine animals. Another group of mice was each fed with 5 µg of LT R192G and yet another group each fed with 1x PBS (pH 7.2) (Abimiku et al., 1989; Islam et al., 2010)
• Challenge Protocol: Mice were challenged with bacterial culture 3 weeks after the second vaccine dose, immediately after tail vein blood collection. A 48-h bacterial culture grown on campylobacter agar was suspended in PBS (pH 7.2) to a concentration of 2 x 109 CFU per ml, and 0.5 ml of the suspension was orally fed to the mice immediately after neutralization of the gastric acidity (Islam et al., 2010).
• Efficacy: The vaccine produced robust antibody responses against both antigens in serum and secretion. Since strain C31 was a poor colonizer, homologous protection could not be studied. The protective efficacies of heterologous strains were 43% (for strain 48, P < 0.001), 29% (for strain 75, P < 0.005), and 42% (for strain 111, P < 0.001) for the 9-day period compared to control mice given phosphate-buffered saline (Islam et al., 2010).