James R. Andreasen, Jr., John R. Glisson, Mark A. Goodwin, Reynaldo S. Resurreccion, Pedro Villegas, John Brown, Studies of Infectious Laryngotracheitis Vaccines: Immunity in Layers, Avian Diseases, Vol. 33, No. 3 (Jul. - Sep., 1989), pp. 524-530
No takes yet. Share an insight, caveat, or question.
Andreasen et al. (1989) studied this question.