2.3.2. Data collection
A standardized questionnaire was administered during interviews
to obtain information on: demographic data (age,
gender, time at present residence and work in the rice
fields); agricultural activities such as harvesting rice, grass,
corn, manioc, beans and sugarcane, and raising or caring
for various types of cattle; the use of protective footwear;
exposure to water sources during leisure activities; the presence
of reservoirs in the home and on plantations; and a past
history of leptospirosis.