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Volume 19, Number 7—July 2013

Dispatch

Schmallenberg Virus among Female Lambs, Belgium, 2012

François Claine, Damien Coupeau, Laetitia Wiggers, Benoît Muylkens, and Nathalie KirschvinkComments to Author 
Author affiliations: Namur Research Institute for Life Sciences, University of Namur, Namur, Belgium

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Table

Time course of Schmallenberg virus spreading among female lambs born in late autumn and in January 2013 assessed by RT-q PCR and seroneutralization *

Date of blood sampling 2012
Jul 11 Jul 25 Aug 8 Aug 22 Sep 5 Sep 17 Oct 3 Oct 17
No. (%) cumulative positive RT-qPCR results at each sampling date
Lambs born in autumn 2012† 0 3 (8) 5 (13) 11 (29) 25 (66) 30 (79) 36 (95) 38 (100)
Lambs born in January 2013‡ 0
0
0
5 (42)
9 (75)
11 (92)
12 (100)
12 (100)
No. (%) cumulated positive seroneutralization results at each sampling date
Lambs born in autumn 2012† 0 0 3 (8) 8 (21) 18 (47) 22 (58) 33 (87) 35 (92)
Lambs born in January 2013‡ 0 0 0 0 2 (17) 2 (17) 6 (50) 8(67)

*Cumulated positive results obtained between July and October 2012 are expressed as absolute numbers and percentages.RT-qPCR results were considered positive if cycle threshold value was <40. Seroneutralization results were considered positive if log2 50% effective dose values were > 3.5. RT-qPCR,real-time reverse transcription quantitative PCR.
†n=38.
‡n=12.

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