Table 1. Demographic characteristics of respondents to a survey conducted after an outbreak of anthrax infections among humans and hippopotamuses living in a game reserve area, by case status, Chama District, Zambia, September 2011* .

Characteristic	Persons with anthrax diagnosed since July 2011, n = 31	Persons without anthrax diagnosed since July 2011, n = 137
Median age (range), y	33 (15–72)	34 (15–83)
Sex, %
M	68	36
F	32	64

*116 (41%) of survey participants reported that they did not know whether they had had anthrax diagnosed since July 2011; of these, median age was 30 (range 15–77) years, and 52% were male.