Volume 19, Number 7—July 2013
Dispatch
Schmallenberg Virus among Female Lambs, Belgium, 2012
François Claine, Damien Coupeau, Laetitia Wiggers, Benoît Muylkens, and Nathalie Kirschvink
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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