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Hemagglutinin serotyping of Avibacterium paragallinarum isolates from Ecuador
Arturo Cabrera1, Vladimir Morales-Erasto, Celene Salgado-Miranda
1LAVETEC CIA. LTDA, Av. Diego de Vásquez N75-290 y Av. Occidental, Quito, Ecuador.
Abstract:
Avibacterium paragallinarum is the causative agent of infectious coryza, an acute respiratory disease of chickens. In this study, a total of 28 isolates of A. paragallinarum from Ecuador were serotyped by the hemagglutinin scheme which recognizes nine serovars. Out of 28 isolates, 17 isolates belonged to serovar A-3, and five isolates to each serovars B-1 and C-1, whereas one isolate was non-typeable. This is the first report of A. paragallinarum serovar A-3 outside Brazil and serovar C-1 outside Japan.
Insights
This study identified infectious coryza strains in Ecuador. Serovar A-3 was most common, with serovars B-1 and C-1 also detected, marking new geographic records for A-3 and C-1.
Area of Science:
- Veterinary Microbiology
- Avian Pathology
- Bacteriology
Background:
- Infectious coryza is an acute avian respiratory disease caused by Avibacterium paragallinarum.
- Understanding the serovar distribution of A. paragallinarum is crucial for effective disease control and vaccine development.
Purpose of the Study:
- To serotype isolates of Avibacterium paragallinarum from Ecuador.
- To determine the prevalence of different serovars within the Ecuadorian chicken population.
- To establish new geographic distribution records for specific A. paragallinarum serovars.
Main Methods:
- Serotyping of 28 Avibacterium paragallinarum isolates using the hemagglutinin scheme.
- Identification of nine recognized serovars.
Main Results:
- Out of 28 isolates, 17 belonged to serovar A-3.
- Five isolates each belonged to serovars B-1 and C-1.
- One isolate was non-typeable.
Conclusions:
- Serovar A-3 is the predominant serovar of A. paragallinarum in Ecuador.
- The presence of serovar A-3 in Ecuador represents its first report outside Brazil.
- The identification of serovar C-1 in Ecuador marks its first report outside Japan, highlighting the need for updated diagnostic and control strategies.
