Table 2.

Cumulative prevalence of Cryptosporidium and Giardia and percentage of new positives in different age groups of dogs

Age category (months)	Cryptosporidium Cumulative prevalencea in %	Giardia Cumulative prevalencea in %	Cryptosporidium		Giardia
			Number of dogs	New positives in %	Number of dogs	New positives in %
3	19.7	7.9	264	21.6	264	8.7
4	34.5	11.0	177b	20.1	228b	3.1
6	42.3	16.2	121b	17.4	171b	5.8
12	44.1	20.7	77b	6.4	114b	9.6

^a based on 290 participating dogs.

^b dogs found negative in (all) preceding age groups; positive dogs were excluded from the following age group(s).