Abstract
Prevalence of Avian Influenza H5, H7 and H9 Viruses in Commercial Broilers at Karachi, Pakistan
Highlights
Poultry is largest subsector of agriculture in Pakistan that has become a balancing force for increasing consumers demand for meat
Pathogenic avian influenza was first time reported in northern areas of Pakistan in the early 90’s (Naeem et al, 1995) afterwards the second outbreak was reported as low pathogenic H9N2 in 1998 that caused 10-20% mortality and decreased egg production up to 75% (Naeem et al, 1999) and it was reported that the respiratory infections in poultry were associated with H5, H7 and H9 viruses at southern Pakistan during 2007-8 (Ahmed et al, 2009)
Results revealed that the overall seasonal seroprevalence was significantly higher (P
Summary
Poultry is largest subsector of agriculture in Pakistan that has become a balancing force for increasing consumers demand for meat It contributes 35% of overall meat production in the country with growth rate of 9.1% (GoP, 2019). Avian influenza (AI) is a member of family Orthomyxoviridae and was subtyped into 16 hemagglutination (H1-16) and 9 neuraminidases (N1-9) Based on pathogenicity, it has two pathotypes such as highly pathogenic (HP) and low pathogenic (LP), the former have pathogenicity index (P.I) greater than 1.2 whereas latter have P.I lower than 1.2 (OIE, 2015). Pathogenic avian influenza was first time reported in northern areas of Pakistan in the early 90’s (Naeem et al, 1995) afterwards the second outbreak was reported as low pathogenic H9N2 in 1998 that caused 10-20% mortality and decreased egg production up to 75% (Naeem et al, 1999) and it was reported that the respiratory infections in poultry were associated with H5, H7 and H9 viruses at southern Pakistan during 2007-8 (Ahmed et al, 2009)
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