EN
There was assessed the dynamics of IgM, IgG, IgA and a total amount of immunoglobulins expressed in turbidometric units (ZST) in diseased and suspected foxes to be ill, and in healthy animals. It was found that in the first period of distemper (1—10 days) there was found an increase of IgM and from 4—7 day a decrease of IgG, IgA and total amounts of immunoglobulins. Before death (day 13) the level of immunoglobulins decreased at 50—400%.