Key result
Four novel fowl adenovirus serotype-4 isolates from Guangdong Province demonstrated 99.8-99.9% hexon gene nucleotide identity and clustered phylogenetically with FAdV-C strains.
Why the study?
The study was conducted to isolate potentially novel strains of fowl adenovirus serotype-4 circulating in broiler chicken flocks in Guangdong Province, China, and compare their hexon gene sequences.
Novel FAdV-4 isolates from Guangdong Province, China, are highly homologous to other FAdV-C strains, providing insight into the epidemiology of hydropericardium syndrome in poultry.
Answers are grounded in this paper and cite their sources.
Novel FAdV-4 strains in Guangdong broilers warrant updated surveillance; leaves open questions on pathogenicity and vaccine updates.
Aim: Our aim in this study was to isolate potentially novel strains of fowl adenovirus serotype-4 (FAdV-4) that is currently circulating in broiler chicken flocks in Guangdong Province, China, and to compare nucleotide and amino acid (AA) sequences of their respective hexon genes. Materials and Methods: The experiment was carried out on poultry farms experiencing outbreaks of FAdV-4-associated hydropericardium syndrome (HPS). Tissue samples from the hearts and livers of deceased chickens were screened for FAdV-4 infection using hexon gene-specific polymerase chain reaction (PCR). Results: New virus isolates were used to infect 7-day-old chicks, which went onto reproduce typical HPS signs. The hypervariable region of the FAdV-4 hexon gene was PCR-amplified and sequenced. The hexon nucleotide and deduced AA sequence identities were 99.8-99.9% and 99.5-99.8%, respectively, among the four novel isolates. In addition, the new isolates were 97-100% and 96.4-99.9% identical to the nucleotide and deduced AA sequences, respectively, of FAdV-4 hexon genes available in the National Center for Biotechnology Information GenBank database. Phylogenetic analyses, based on the hexon gene sequence, revealed that the new isolates, clustered with FAdV-C; the FAdV-A, FAdV-B, FAdV-D, and FAdV-E viruses, were more distantly related. Conclusion: New FAdV-4 isolates from Guangdong Province are similar to those identified in other regions of the world. This information provides critical insight into HPS epidemiology and provides a perspective for monitoring outbreaks and developing strategies for disease prevention.
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Fu et al. (2020) studied Hydropericardium syndrome (HPS) in chickens (n=4). Fowl adenovirus serotype-4 (FAdV-4) infection was evaluated on Nucleotide and amino acid sequence identity of the hexon gene. Four novel fowl adenovirus serotype-4 isolates from Guangdong Province demonstrated 99.8-99.9% hexon gene nucleotide identity and clustered phylogenetically with FAdV-C strains.
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