Porcine Swine Influenza Study Guide
Overview and Clinical Importance
Swine Influenza (SI) is a highly contagious acute respiratory disease of pigs caused by Influenza A virus (IAV). This enveloped, negative-sense, single-stranded RNA virus belongs to the family Orthomyxoviridae. Swine influenza is endemic in pig-producing regions worldwide and represents a significant economic concern due to weight loss, reduced growth rates, and secondary infections.
Pigs serve as important "mixing vessels" for influenza viruses because they possess receptors for both avian (alpha-2,3-linked sialic acid) and human (alpha-2,6-linked sialic acid) influenza strains. This unique susceptibility allows genetic reassortment between different influenza subtypes, potentially generating novel pandemic strains with zoonotic potential.
Etiology
Virus Classification and Structure
Family: Orthomyxoviridae | Genus: Alphainfluenzavirus | Species: Influenza A virus
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