It may take about 5 days after vaccination but when post vaccination reaction occur it refers that the general immune system of the bird not good and you must take care from using of antibiotics that hve immuno suppressive effect on the immune system in treating respiratory manifestion which follow the vaccination like oxytetracycline and cholorteteracycline and others but you must concentrate on immune stimulant drugs
it depends on many factores.the levels of the immune system and the enviroment situations are important but one of the most important factores affecting the reactions is the good quality management of the vaccinating.i mean if you reduse the estress during the vaccinatin (OR-IM-SC-IO) you will observe less reactions.
first depends on vaccines and disease , for example IB H120 or IB 4/91 strain , or ND Lasota , B1 , clon , ... have a deferent reactions. then other factors such as levels of the immune system , Geographic areas , stress and etc
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