THE VACCINE CONTAINS THE MASSACHUSETTS TYPE OF BRONCHITIS;VIRUS IN LIVE, FREEZE-DRIED FORM. THE EMBRYONATED CHICKEN EGGS;USED IN THE PRODUCTION OF THE VACCINE ARE OBTAINED FROM;SPECIFIC-PATHOGEN-FREE (SPF) FLOCKS.;ONE DOSE CONTAINS:;MASSACHUSETTS TYPE OF BRONCHITIS VIRUS....AT LEAST 10^2.63 EID50