From: A large community outbreak of waterborne giardiasis- delayed detection in a non-endemic urban area
Watersupply | Cases | Number of recipents | Attack-rate (per 10,000) | ||
---|---|---|---|---|---|
A | 637 | 42,774 | 148.9 | ||
B | 15 | 9,685 | 15.5 | ||
C | 89 | 105,440 | 8.4 | ||
D | 33 | 34,406 | 9.6 | ||
E | 4 | 14,266 | 2.8 | ||
F | 13 | 23,848 | 5.5 | ||
Risk ratio | 95% confidence interval | ||||
B+C+D+E+F | 158 | 194,519 | 8.1 | Ref. | |
A | 637 | 42,774 | 148.9 | 18.3 | 15.4 – 21.8 |