Table 2.

Proportion of positive test results across all parasites by United States Census Bureau regions

Parasite	Midwest		Northeast		South		West
	Centrifugation (%) (95% CI)	Coproantigen (%) (95% CI)	Centrifugation (%) (95% CI)	Coproantigen (%) (95% CI)	Centrifugation (%) (95% CI)	Coproantigen (%) (95% CI)	Centrifugation (%) (95% CI)	Coproantigen (%) (95% CI)
Ascarid	6.2 (5.8–6.5)	8.2 (7.8–8.6)	5.8 (5.6–6.1)	8.0 (7.7–8.2)	3.9 (3.6–4.2)	5.2 (4.9–5.6)	1.4 (1.2–1.6)	2.0 (1.8–2.2)
Cystoisospora	1.8 (1.6–2.0)	–	1.8 (1.7–1.9)	–	2.2 (1.9–2.4)	–	2.2 (2.0–2.5)	–
Giardia	2.0 (1.8–2.2)	7.5 (7.1–7.9)	1.4 (1.3–1.5)	6.6 (6.4–6.9)	1.7 (1.5–1.8)	5.9 (5.5–6.2)	2.0 (1.8–2.2)	6.1 (5.8–6.4)
Tapeworm	0.7 (0.6–0.8)	–	0.7 (0.6–0.8)	–	1.1 (1.0–1.3)	–	1.5 (1.3–1.7)	–
Hookworm	0.5 (0.4–0.6)	1.0 (0.8–1.1)	0.4 (0.4–0.5)	0.9 (0.8–1.0)	1.1 (0.9–1.3)	1.7 (1.5–1.9)	0.1 (< 0.1–0.1)	0.4 (0.3–0.5)
Lungworm	0.3 (0.3–0.4)	–	0.4 (0.4–0.5)	–	0.1 (0.1–0.2)	–	< 0.1 (< 0.1–0.1)	–
Whipworm	< 0.1(< 0.1–0.1)	0.2 (0.1–0.2)	< 0.1 (< 0.1–< 0.1)	0.1 (0.1–0.2)	0.1 (0.1–0.2)	0.3 (0.2–0.4)	< 0.1 (< 0.1–< 0.1)	0.1 (0.1–0.2)