[Immunity after newcastle disease in man (author's transl)].

5 patients, in whom Newcastle disease was diagnosed on the basis of a positive haemagglutination inhibition test (HIT) following contact with affected chickens in 1970 were re-examined recently. The ophthalmological findings were negative at follow-up in all cases. The HIT was still positive (1 : 8) in one patient only; no antibodies were detected in the other four patients.