Table 1.

Questionnaire responses given by participants assessed for Giardia duodenalis infection using the diagnostic 18S real-time polymerase chain reaction across all four schools (N = 305)

Question	Responded yes	Responded no
Do you drink the lake [Lake Malawi] water?	187 (63%)	122 (37%)
Do you have regular contact with livestock cattle (cows)?	166 (54%)	139 (46%)
Do you currently have abdominal (stomach) pain?	135 (44%)	170 (56%)
Do you currently have loose stool (diarrhea)?	98 (32%)	207 (68%)