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Volume 17, Number 3—March 2011

Research

Reduction of Coxiella burnetii Prevalence by Vaccination of Goats and Sheep, the Netherlands

Lenny HogerwerfComments to Author , René van den Brom, Hendrik I.J. Roest, Annemarie Bouma, Piet Vellema, Maarten Pieterse, Daan Dercksen, and Mirjam Nielen
Author affiliations: Author affiliations: Utrecht University, Utrecht, the Netherlands (L. Hogerwerf, A. Bouma, M. Pieterse, M. Nielen); Animal Health Service, Deventer, the Netherlands (R. van den Brom, P. Vellema, D. Dercksen); Central Veterinary Institute of Wageningen UR, Lelystad, the Netherlands (H.I.J. Roest)

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Table 2

Quantitative PCR results and prevalence for samples positive for Coxiella burnetii for 957 animals in 13 small ruminant herds, the Netherlands, January–April 2010*

Farm Group Uterine fluid
Vaginal mucus
Milk
No. Pos D % (95% CI) No. Pos D % (95% CI) No. Pos D % (95% CI)
Unvaccinated goats
A Young 46 0 0 0 (0–6) 0 0 0 NA 0 0 0 NA
Old 47 0 2 0 (0–6) 0 0 0 NA 52 8 2 15 (6–25)
B Young 74 35 16 47 (36–59) 76 75 0 99 (96–100) 0 0 0 NA
Old 26 10 2 39 (20–57) 26 26 0 100 26 17 8 65 (47–84)
F Young 49 35 4 71 (59–84) 53 52 0 98 (95–100) 0 0 0 NA
Old 0 0 0 NA 0 0 0 NA 0 0 0 NA
K Young 26 17 5 65 (47–84) 32 32 0 100 0 0 0 NA
Old 28 12 3 43 (25–61) 39 39 0 100 34 33 0 97 (91–100)
L Young 37 0 0 0 (0–8) 37 2 9 5 (0–13) 0 0 0 NA

Old
58
0
0
0 (0–5)

58
1
3
2 (0–5)

51
2
3
4 (0–9)
Unvaccinated sheep
X Young 17 5 2 29 (8–51) 17 17 0 100 0 0 0 NA

Old
79
11
13
14 (6–22)

82
76
1
93 (87–98)

79
19
18
24 (15–34)
Vaccinated goats
H Young 48 1 0 2 (0–6) 49 1 5 2 (0–6) 0 0 0 NA
Old 50 0 0 0 (0–6) 50 6 11 12 (3–21) 37 0 0 0 (0–8)
M Young 50 0 1 0 (0–6) 49 46 2 94 (87–100) 0 0 0 NA
Old 47 1 3 2 (0–6) 48 47 0 98 (94–100) 47 5 12 11 (2–20)
P Young 0 0 0 NA 0 0 0 NA 0 0 0 NA
Old 0 0 0 NA 30 12 9 40 (23–58) 30 1 0 3 (0–10)
Q Young 49 0 0 0 (0–6) 50 2 8 4 (0–9) 0 0 0 NA
Old 49 0 1 0 (0–6) 50 2 12 4 (0–9) 50 0 2 0 (0–6)
R Young 0 0 0 NA 0 0 0 NA 0 0 0 NA
Old 10 0 0 0 (0–26) 0 0 0 NA 10 0 0 0 (0–26)
S Young 46 0 0 0 (0–6) 50 4 6 8 (0–16) 0 0 0 NA
Old 25 0 0 0 (0–11) 28 2 5 7 (0–17) 28 1 5 4 (0–10)
T Young 49 0 0 0 (0–6) 0 0 0 NA 0 0 0 NA
Old 47 0 0 0 (0–6) 0 0 0 NA 46 3 3 7 (0–14)

*No., no. tested; pos, no. with positive result; D, no. with doubtful result; %, prevalence; CI, confidence interval; young, nulliparous; NA, not applicable; old, pregnant and lactating.

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