[Effect of vaccinal strain 17D of the yellow fever virus on the nature of proprioceptive information processing in the course of training BALB/c strain mice].

The influence of asymptomatic neuroviral infection produced by the 17D vaccine strain of yellow fever virus on the conditional reflex development of intracerebrally inoculated BALB/c mice was studied. In the virus-infected animals, the development of a conditional reflex in the labyrinth was hampered, on the one hand, by weakening of the inhibition process in the brain due to viral infection which was manifested by regular reproduction of "excess" information and perseverance; on the other hand, the development of the conditional reflex was made difficult because of the disturbance of the mechanisms providing for prolonged permanent level of awakeness. The observed changes were not accompanied by marked pathomorphological lesions in the CNS.