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Vaccine Detail

A. pleuropneumoniae HS93C-Ampr
Vaccine Information
  • Vaccine Name: A. pleuropneumoniae HS93C-Ampr
  • Target Pathogen: Actinobacillus pleuropneumoniae
  • Target Disease: porcine pleuropneumonia
  • Vaccine Ontology ID: VO_0011385
  • Type: Live, attenuated vaccine
  • Status: Research
  • Antigen: A. pleuropneumoniae ApxII-activating protein, ApxIIC
  • ApxIIC gene engineering:
    • Type: Gene mutation
    • Description: Site-specific mutagenesis of the apxIIC gene utilized the recombination plasmid pEP-CAmpr. Cesium chloride-purified pEP-CAmpr DNA was isolated from E. coli and linearized with ClaI. Following digestion, the DNA was purified by phenol-chloroform extraction and ethanol precipitated. A total of 3 μg of linearized DNA was electroporated (0.2-cm-diameter cuvettes; 400 Ω; 1.25 kV) into A. pleuropneumoniae HS93 (serovar 7, ApxII) (Prideaux et al., 1999).
    • Detailed Gene Information: Click Here.
  • Immunization Route: Intramuscular injection (i.m.)
Host Response

Pig Response

  • Vaccination Protocol: Nine 6-week-old pigs received 109 CFU of the A. pleuropneumoniae vaccine strain in 1 ml of growth medium, via intranasal inoculation on day 0, while nine control pigs received 1 ml of BHI. The vaccine was prepared by inoculating 10 ml of BHI-NAD (10 μg/ml) with a single colony of the vaccine strain and growing with shaking at 37°C until an OD600 of 0.8 was reached. The vaccination schedule was repeated on day 14. On day 28, the nine vaccinated and nine control pigs were divided into groups of six and three (Prideaux et al., 1999).
  • Challenge Protocol: Two groups of six pigs (i.e., vaccinated and unvaccinated) were challenged with 2 × 109 A. pleuropneumoniae HS25 (serovar 1) in 2 ml of growth medium via the intranasal route, while the groups of three were given 2 ml of BHI broth in a similar manner. The challenge strain was prepared by inoculating a single colony of HS25 into BHI-NAD (10 μg/ml) and growing until an OD600 of 0.8 was reached. At this time the viable count was 109 CFU/ml. At 5 days postchallenge, pigs were euthanized, and the number and severity of lung lesions were recorded (Prideaux et al., 1999).
  • Efficacy: Pigs vaccinated with live HS93C- Ampr via the intranasal route were protected against a cross-serovar challenge with a virulent serovar 1 strain of A. pleuropneumoniae (Prideaux et al., 1999).
References
Prideaux et al., 1999: Prideaux CT, Lenghaus C, Krywult J, Hodgson AL. Vaccination and protection of pigs against pleuropneumonia with a vaccine strain of Actinobacillus pleuropneumoniae produced by site-specific mutagenesis of the ApxII operon. Infection and immunity. 1999; 67(4); 1962-1966. [PubMed: 10085043].