Table 1.

Prevalence of intestinal parasites and factors associated with this prevalence in different dog populations. Percentages given for specific parasites refer to percentage of dogs that were found positive for an infection within a category of risk factor

Dog population	Parasite species	Prevalence (%) (95% CI)	Infection intensity	History of diarrhoea
			Mediana (Range)	With diarrhoea	Without diarrhoea
Shelter	All	62.9 (57.3–68.6)		46.0	54.0
	Giardia	54.3 (48.5–60.2)	4,450 (100–222,800)	51.6	56.7
	Cryptosporidium	14.7 (10.6–18.9)	200 (100–1,400)	7.8	20.7
	Toxocara spp.	12.2 (8.4–16.1)	79 (1–12,000)	3.9	19.3
	T. leonina	6.1 (3.3–8.9)	153 (2–3,330)	0.8	10.7
	Hookworms	9.7 (6.3–13.2)	31 (3–588)	3.1	15.3
	Capillariidae	0.7 (0.0–1.7)	1.5 (1 & 2)	0.8	0.7
	Cystoisospora	7.6 (4.4–10.7)	26 (1–1,800)	7.8	7.3
Household	All	23.8 (20.2–27.4)		25.5	74.5
	Giardia	12.9 (10.0–15.7)	10,400 (100–75,800)	20.5	10.4
	Cryptosporidium	1.9 (0.7–3.1)	300 (100–40,300)	4.5	1.3
	Toxocara spp.	5.1 (3.2–7.0)	29 (2–4,284)	6.8	4.6
	T. leonina	0.9 (0.1–1.8)	51 (15–223)	0	1.0
	Hookworms	5.3 (3.4–7.2)	9 (1–423)	1.5	6.6
	Capillariidae	1.9 (0.7–3.1)	4.5 (1–1,246)	2.3	1.8
	Cystoisospora	2.5 (1.1–3.8)	7 (1–8,400)	3.8	2.0
Shepherd	All	51.4 (39.8–62.9)		0	100
	Giardia	4.2 (0.0–8.8)	11,800 (3,000–122,700)	0	4.2
	Cryptosporidium	1.4 (0.0–4.1)	1,200 (1,200)	0	1.4
	Toxocara spp.	8.3 (1.9–14.7)	118.5 (27–2543)	0	8.3
	T. leonina	2.8 (0.0–6.6)	282.5 (109 & 456)	0	2.8
	Hookworms	33.3 (22.4–44.2)	19 (1–894)	0	33.3
	Capillariidae	4.2 (0.0–8.8)	20 (1–36)	0	4.2
	Cystoisospora	8.3 (1.9–14.7)	3.5 (1–41)	0	8.3
	Taeniid	6.9 (1.1–12.8)	16 (3–72)	0	6.9

^aMedian number of cysts/oocysts/eggs per gram of faeces