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Volume 20, Number 3—March 2014
Research

Coxiella burnetii Seroprevalence and Risk for Humans on Dairy Cattle Farms, the Netherlands, 2010–2011

B. Schimmer1Comments to Author , N. Schotten1, E. van Engelen, J.L.A. Hautvast, P.M. Schneeberger, and Y.T.H.P. van Duijnhoven
Author affiliations: National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands (B. Schimmer, N. Schotten, Y.T.H.P. van Duynhoven); Animal Health Service, Deventer, the Netherlands (E. van Engelen); Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands (J.L.A. Hautvast); Jeroen Bosch Hospital, ‘s-Hertogenbosch, the Netherlands (P.M. Schneeberger)

Main Article

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.

Main Article

1These authors contributed equally to this article.

Page created: February 19, 2014
Page updated: February 19, 2014
Page reviewed: February 19, 2014
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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