Abstract
While the lifetime risk in the general population is just below 1%, it is 6.5% infirst-degree relatives of patients [1] and it rises to more than 40% in monozygotic twins of affected people. Two twin studies on psychotic illnesses could be found on searching the Indian Journal of Psychiatry, one is a case report of mania in twins [4] and the other one is a case report of Folie a deux in identical twin sisters.
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