This study was conducted to investigate whether different types of Infectious
Bronchitis Virus vaccines can affect the cilia of tracheal epithelium of broiler birds, in
comparison with Newcastle Disease and Avian Influenza Vaccines. as positive control.
Sixty one-day-old broiler birds of both sexes were used in this experiment. The bird
were randomly divided in to six groups of ten birds each. Each group was placed in a
separated pin.One of these groups,Group 6 was acted as negative control,whereas the
other 5groups were vaccinated with ND, AI and 3 type of IB vaccines. Age, dose and
route of administration of different type of vaccines were conducted according to the
manufactures directions. Group 1 was vaccinated with ND vaccine at seventh &
seventeenth day of age , group 2 was vaccinated with AIV vaccine at first & twenty one
day of age , these 2 groups were acted as positive control .Group 3,4,5, were vaccinated
at first&tenth day of age with different types of IB vaccines . BIVAC1 was used for
group 3, IBMA5 was used for vaccination of group 4, whereas IB-H120 vaccine was
administrated to group 5 . Four days post vaccination; all groups were observed for
clinical signs. All experimental birds were killed and tracheal rings were examined for
ciliostasis and Carboniferous Pigment Granules test. The result indicated that group ND
vaccineswas 95%, while that of group AI vaccines was 93% whereas the results of these
3 types of vaccines were 21%, 33%, 20% for BIVAC1, IBMA5 &IBH120 respectively,
while the control was 100% .