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Virulence of South African isolates of Haemophilus paragallinarum. Part 1: NAD-dependent field isolates.
Onderstepoort J Vet Res. 2002 Jun; 69(2):163-9.OJ

Abstract

The virulence of four South African field isolates of NAD-dependent Haemophilus paragallinarum, representing the four serovars known to occur in that country, was investigated. During this study an alternative challenge model for infectious coryza was used, in which the infectivity as well the virulence of different isolates could be evaluated. The challenge model consisted of the direct challenge, via intrasinus injection of one chicken in a row of interconnected layer cages, containing 10 chickens, which are subsequently infected by natural routes. A scoring system of the clinical signs was established in which a score is given to the ability of the isolate to produce clinical signs in the challenge birds. The mean daily disease score for the flock can be calculated and plotted on a graph to give a graphic representation of the disease profile. A mean disease score, calculated over a 20-day examination period can be calculated. Isolates can then be compared to each other, either graphically or by a comparison of the mean disease scores. It has been demonstrated using this scoring system that the South African serogroup C isolates appear to be more virulent than the South African serogroup A or B isolates. It was further established that the serovar C-3 isolate appeared to be the most virulent.

Authors+Show Affiliations

Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, South Africa. BraggRR@Sci.uovs.ac.za

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12234003

Citation

Bragg, R R.. "Virulence of South African Isolates of Haemophilus Paragallinarum. Part 1: NAD-dependent Field Isolates." The Onderstepoort Journal of Veterinary Research, vol. 69, no. 2, 2002, pp. 163-9.
Bragg RR. Virulence of South African isolates of Haemophilus paragallinarum. Part 1: NAD-dependent field isolates. Onderstepoort J Vet Res. 2002;69(2):163-9.
Bragg, R. R. (2002). Virulence of South African isolates of Haemophilus paragallinarum. Part 1: NAD-dependent field isolates. The Onderstepoort Journal of Veterinary Research, 69(2), 163-9.
Bragg RR. Virulence of South African Isolates of Haemophilus Paragallinarum. Part 1: NAD-dependent Field Isolates. Onderstepoort J Vet Res. 2002;69(2):163-9. PubMed PMID: 12234003.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Virulence of South African isolates of Haemophilus paragallinarum. Part 1: NAD-dependent field isolates. A1 - Bragg,R R, PY - 2002/9/18/pubmed PY - 2002/12/10/medline PY - 2002/9/18/entrez SP - 163 EP - 9 JF - The Onderstepoort journal of veterinary research JO - Onderstepoort J. Vet. Res. VL - 69 IS - 2 N2 - The virulence of four South African field isolates of NAD-dependent Haemophilus paragallinarum, representing the four serovars known to occur in that country, was investigated. During this study an alternative challenge model for infectious coryza was used, in which the infectivity as well the virulence of different isolates could be evaluated. The challenge model consisted of the direct challenge, via intrasinus injection of one chicken in a row of interconnected layer cages, containing 10 chickens, which are subsequently infected by natural routes. A scoring system of the clinical signs was established in which a score is given to the ability of the isolate to produce clinical signs in the challenge birds. The mean daily disease score for the flock can be calculated and plotted on a graph to give a graphic representation of the disease profile. A mean disease score, calculated over a 20-day examination period can be calculated. Isolates can then be compared to each other, either graphically or by a comparison of the mean disease scores. It has been demonstrated using this scoring system that the South African serogroup C isolates appear to be more virulent than the South African serogroup A or B isolates. It was further established that the serovar C-3 isolate appeared to be the most virulent. SN - 0030-2465 UR - https://www.unboundmedicine.com/medline/citation/12234003/Virulence_of_South_African_isolates_of_Haemophilus_paragallinarum__Part_1:_NAD_dependent_field_isolates_ L2 - https://medlineplus.gov/haemophilusinfections.html DB - PRIME DP - Unbound Medicine ER -
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