A Community Outbreak of Cryptosporidiosis in Sydney Associated with a Public Swimming Facility: A Case-Control Study
Table 1
Unadjusted and adjusted matched odds ratios for risk factors associated with Cryptosporidium infection.
Cases (Total = 31)
Controls (Total = 97)
Matched odds ratio
Exposed
Percent
Exposed
Percent
Unadjusted
95% CI
Adjusted*
95% CI
Female
14
45
51
53
0.8
0.4–1.7
Contact with people with diarrhoea
13
42
13
13
5.6
1.9–16.0
7.7
1.9–31.4
Contact with people with vomiting
9
29
7
7
5.9
1.8–19.3
Attended childcare or preschool
12
39
27
28
1.7
0.7–4.5
Drank mains water
31
100
94
97
Undefined
Drank bottled water
1
3
10
10
0.2
0.0–2.0
Drank untreated water
0
0
0
0
Undefined
Any swimming
26
84
56
58
4.1
1.4–12.6
Swam in pool at Facility A†
15
48
11
11
15.8
3.5–70.9
19.4
3.7–100.8
Swam in pool other than at Facility A
7
23
21
22
1.1
0.4–3.0
Swam in other water body (e.g., dam and ocean)
11
35
34
35
1.0
0.4–2.3
Animal contact
10
32
61
63
0.3
0.1–0.7
0.2
0.1–0.7
Visited a farm
0
0
9
9
Undefined
International travel
0
0
3
3
Undefined
Domestic travel
0
0
23
24
Undefined
*︢Adjusted for all other variables in the model; †No other pools were associated with diagnosis of cryptosporidiosis disease; CI = confidence interval.
