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Applied and Environmental Microbiology, May 2004, p. 3183-3187, Vol. 70, No. 5
0099-2240/04/$08.00+0 DOI: 10.1128/AEM.70.5.3183-3187.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
Multiplex PCR Assay for Detection of Bacterial Pathogens Associated with Warm-Water Streptococcosis in Fish
A. I. Mata, A. Gibello, A. Casamayor, M. M. Blanco, L. Domínguez, and J. F. Fernández-Garayzábal*
Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain
Received 6 November 2003/
Accepted 31 January 2004
A multiplex PCR-based method was designed for the simultaneous detection of the main pathogens involved in warm-water streptococcosis in fish (Streptococcus iniae, Streptococcus difficilis, Streptococcus parauberis, and Lactococcus garvieae). Each of the four pairs of oligonucleotide primers exclusively amplified the targeted gene of the specific microorganism. The sensitivity of the multiplex PCR using purified DNA was 25 pg for S. iniae, 12.5 pg for S. difficilis, 50 pg for S. parauberis, and 30 pg for L. garvieae. The multiplex PCR assay was useful for the specific detection of the four species of bacteria not only in pure culture but also in inoculated fish tissue homogenates and naturally infected fish. Therefore, this method could be a useful alternative to the culture-based method for the routine diagnosis of warm-water streptococcal infections in fish.
* Corresponding author. Mailing address: Dpto. de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain. Phone: 34 91 3943716. Fax: 34 91 3943908. E-mail:
garayzab{at}vet.ucm.es.
Applied and Environmental Microbiology, May 2004, p. 3183-3187, Vol. 70, No. 5
0099-2240/04/$08.00+0 DOI: 10.1128/AEM.70.5.3183-3187.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
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