Volume 20, Number 3—March 2014
Research
Coxiella burnetii Seroprevalence and Risk for Humans on Dairy Cattle Farms, the Netherlands, 2010–2011
B. Schimmer1
, N. Schotten1, E. van Engelen, J.L.A. Hautvast, P.M. Schneeberger, and Y.T.H.P. van Duijnhoven
, N. Schotten1, E. van Engelen, J.L.A. Hautvast, P.M. Schneeberger, and Y.T.H.P. van Duijnhoven
Table 1
Nonresponse analyses of farms in a study of Coxiella burnetii seroprevalence and risk for seropositivity in humans on dairy cattle farms, the Netherlands, September 2010–March 2011
| Variable | Farms |
p value | |
|---|---|---|---|
| Participating, n = 311 | Nonparticipating, n = 2,685 | ||
| Categorical, no. (%) | |||
| Farm located inside vaccination area | 83 (26.4) | 590 (21.9) | 0.08 |
| Farm region* | 0.36 | ||
| North | 80 (25.4) | 781 (29.1) | |
| East | 104 (33.7) | 911 (33.9) | |
| West | 57 (18.7) | 494 (18.3) | |
| South | 70 (22.2) | 503 (18.7) | |
| Degree of urbanization of the farm municipality | 0.77 | ||
| Moderately, strongly, or extremely (>1,000 addresses/km2) | 1 (0.3) | 17 (0.6) | |
| Hardly (500–1,000 addresses/km2) | 10 (3.2) | 94 (3.5) | |
| Not (<500 addresses/km2) |
300 (96.5) |
2,574 (95.9) |
|
| Numerical, median no. | |||
| No. cows in 2008 | |||
| <1 | 35 | 35 | 0.44 |
| 1–2 | 26 | 26 | 0.65 |
| >2 | 85 | 86 | 0.16 |
| Nearest bulk tank milk positive small-ruminant farm (meters) | 9,793 | 11,301 | 0.01 |
| Goat density (animals/km2)† | |||
| Within 5-km radius | 9.2 | 6.7 | 0.27 |
| Within 10-km radius | 9.3 | 9.2 | 0.26 |
| Sheep density (animals/km2)† | |||
| Within 5-km radius | 30 | 33 | 0.04 |
| Within 10-km radius | 34 | 35 | 0.11 |
| Cattle density (animals/km2) within 5-km radius† | |||
| Including own animals | 178 | 181 | 0.29 |
| Excluding own animals | 175 | 179 | 0.27 |
| Cattle density (animals/km2) within 10-km radius† | |||
| Including own animals | 170 | 170 | 0.99 |
| Excluding own animals | 169 | 169 | 0.91 |
*North represents Groningen, Friesland, and Drenthe Provinces; East represents Gelderland, Overijssel, and Flevoland Provinces; West represents Noord–Holland, Zuid–Holland, Utrecht, and Zeeland Provinces; and South represents Limburg and Noord–Brabant Provinces.
†Corrected for area in the Netherlands.
1These authors contributed equally to this article.
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