Precautions on using eggs of schistosoma haematobium as an antigen in COPT

The circumoval precipitin test was performed on 60 male patients with active bilharziasis and 20 control normal subjects. Both types of S. mansoni and S. haematobium eggs were used as an antigen. The percentages of positivity, egg reactivity, and the refraction's precipitation intensity were lower on using S. haematobium eggs than with S. mansoni