The coagglutination test was standardised for detection of fowl pox an
tigen in infected scabs and chorioallontoic membrane of chicken embryo
s. The Staphylococcus aureus Cowan I strain, containing large amounts
of Protein A in their cell wall, coated with fowl pox antibodies was f
ound specific and sensitive for detection of fowl pox antigen. The tes
t is easy to perform and rapid as the positive results can be read wit
hin 15 seconds.