Study of 1,038 randomly selected cases of epilepsy in Chandigarh showed the cysticercus haemagglutination test to be a useful adjunct in the diagnosis of cysticerciasis as an aetiological factor. It was positive in 25.7% of epilepsy cases but in only 2% of healthy controls. The rate of seropositivity was higher in focal than in generalized epilepsy although the difference was not statistically significant. Incidence of seropositivity was about equal in males and females but did not appear to be related to the duration of epilepsy.