Variola minor in Bragança Paulista County, 1956. Respiratory manifestations in cases of variola and in household contacts of cases.

A respiratory complication was recorded for 62 of the 485 cases of variola minor occurring in Bragança Paulista County, Brazil, 1956. The respiratory complication preceded onset of the classical variola minor in 2 cases; lasted only the pre-eruptive phase in 38 cases; lasted only the eruptive phase in 9 cases; lasted both the pre-eruptive phases in 1 case and had an unrecorded relationship to the clinical course in 12 cases. Six of the 17 household contacts with a respiratory syndrome contemporaneous with variola in the household had previously suffered from variola.