Table 1.
Prevalence (%)a of Giardia, Cryptosporidium parvum, and Cryptosporidium muris in beef cattle in southern Ontario
| 1998 | 1999 | Both years | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Region | County | nb | Giardia | Cr. parvum | Cr. muris | n | Giardia | Cr. parvum | Cr. muris | n | Giardia | Cr. parvum | Cr. muris |
| South | Lambton | 59 | 13.6 | 20.3 | 5.1 | 29 | 0 | 6.9 | 17.2 | 88 | 9.1 | 15.9 | 9.1 |
| Middlesex | 29 | 10.3 | 41.4 | 3.5 | 20 | 0 | 5 | 0 | 49 | 6.1 | 26.5 | 2.1 | |
| Total | 88 | 12.5 | 27.3 | 4.6 | 49 | 0 | 6.1 | 10.2 | 137 | 8 | 19.7 | 6.6 | |
| West | Bruce | 30 | 10 | 56.7 | 13.3 | 20 | 0 | 10 | 5 | 50 | 6 | 38 | 10 |
| Dufferin | 56 | 12.5 | 12.5 | 16.1 | 50 | 8 | 4 | 2 | 106 | 10.4 | 8.5 | 9.4 | |
| Grey | 41 | 19.5 | 31.7 | 9.8 | 30 | 16.7 | 6.7 | 26.7 | 71 | 18.3 | 21.1 | 16.9 | |
| Huron | 30 | 3.3 | 53.5 | 30 | 30 | 3.3 | 16.7 | 3.3 | 60 | 3.3 | 35.1 | 16.7 | |
| Simcoe | 40 | 15 | 30 | 5 | 38 | 7.9 | 0 | 5.3 | 78 | 11.5 | 15.4 | 5.1 | |
| Wellington | 30 | 10 | 20 | 23.3 | 10 | 0 | 0 | 0 | 40 | 7.5 | 15 | 17.5 | |
| Total | 227 | 12.3 | 31.3 | 15.4 | 178 | 7.3 | 6.2 | 7.3 | 405 | 10.1 | 20.3 | 11.9 | |
| Central | Peterborough | 38 | 15.8 | 18.4 | 10.5 | 30 | 0 | 0 | 6.7 | 68 | 8.8 | 10.3 | 8.8 |
| Victoria | 29 | 0 | 20.7 | 13.8 | 30 | 0 | 3.3 | 10 | 59 | 0 | 11.9 | 11.9 | |
| Total | 67 | 9 | 19.4 | 11.9 | 60 | 0 | 1.7 | 8.4 | 127 | 4.7 | 11 | 10.2 | |
| Overall | 382 | 11.8 | 28.3 | 12.3 | 287 | 4.5 | 5.2 | 8 | 669 | 8.7 | 18.4 | 10.5 | |
aCalculated within each county as number of infected cows/number of cows sampled × 100%
bn = total number of cattle sampled in a given county