Performance of serodiagnosis in sheep infested with or vaccinated against some species of Trichostrongylidae worms using staphylococcus aureus protein A Cowan I strain

A trial on serodiagnosis of Ostertagia infection in sheep by indirect hemagglutination technique with addition of Staphylococcus aureus protein A Cowan I strain [SpA] was carried out. The data revealed that the addition of SpA increased the sensitivity of IHA technique by elevating the antibody titer in infected and immunized sheep. Also, the use of SpA in rapid slide agglutination in helminth diagnosis of pure Ostertagia and Haemonchus and mixed Trichostrongylus infection was successful, giving a result of 100% in the first, 90% in the second and 70% among the third case