[Serological response of rabbits following immunization with M. parainfluenzae-3, adenovirus I and infectious bovine rhinotracheitis virus associated antigens].

The immunization of rabbits separately with virus suspensions of Myxovirus parainfluenzae-3, adenovirus serotype I, and bovine rhinotracheitis virus or with combinations of each two of them and with a combination of all three viruses led to the production of sera having titers of virus-neutralizing antibodies acting against each of the antigens that participated in the combination. Results showed that no inhibition existed of the antigens during immunization as established by the serologic response of the rabbits. The demonstrated specificity of the monovalent sera points to the fact that the latter could be used for the diagnostic purposes.