sero-surveillance results –transcaucasus 2009 · 2016. 4. 8. · • time: may 2008 – mar 2009...
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Carsten Pötzsch, EuFMD/FAO
Emiliana Brocchi, IZSLER; Brescia
Sero-surveillance results –TransCaucasus 2009
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Reported vaccination, spring 2009Vaccination
campaignAzerbaijan Armenia * Georgia
Buffer zone, cattle 99 % (88-100 %) 133 % (87 – 149 %) 36 % (0-59 %)
Buffer zone, small ruminants
19 % (0 – 26 %) 98 % (51 – 130 %) 4 % (0 – 91 %)
National, cattle 99 % (77 – 100 %) 138 % (109 – 150 %) 0 %
National, small ruminants
18 % (0 – 43 %) 97 % (0 – 152 %) 0 %
* for Armenia revaccinations are included
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Objective to estimate the distribution of NSP antibodies in the project buffer zone and other areas
• Two stage random sampling design:
• Village level: estimation of NSP prevalence (according to risk zones)• Animal level: detection of NSP positives (at 10 % prevalence)
• Age of cattle : 4 - 18 months• Time: May 2008 – Mar 2009
Project activities: NSP survey in Trans Caucasus
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Risk zones and vaccination buffer zone
Buffer zone Risk zone 1 (25%)
2 (20%)3 (10%)
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0
10
20
30
40
50
60
70
80
90
100
Arm Azb Nakh Geo NK
NSP survey in Trans Caucasus
Results:• > 12,000 sera collected• > 8,000 sera tested in national labs • no signs of FMD reported
NSP-Ab % 95%confidence intervals
% positive villages
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NSP survey in Trans Caucasus
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NSP results in Trans Caucasus (apparent prevalence)
0 %
> 0 - 20%
> 20 - 40 %
> 40 - 60 %
> 60 %
not sampled
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NSP survey
follow-up investigations
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Brescia testing 2009
Armenia: • Retesting of 2008 survey sera (540, coll. 05-06/08)• follow-up investigation sera (350, collected 01/09)• Retesting of national sero surveillance sera (210, coll.
autumn 08)Georgia• Testing of remaining 2009 survey sera (3200, coll.
11/08-02/09)
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SP results in Georgia & Armania
_
0.0
0.1 - 39.9
40.0 - 59.9
60.0 - 79.9
80.0 - 100.0
100.1 - 999.0
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NSP results - association with BZ & risk zones
* differences at p≤0.05
Armenia Georgia Azerbaijan
BZ 30.5% 5.8% 23.0%
outside BZ 30.9% 5.8% 23.6%
RZ 1 34.5% * 4.7% 25.2%
RZ 2 25.9% * 8.4% * 21.0%
RZ 3 - 4.4% 22.3%
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BZ - outside
NSP- Ab Arm
NSP-Ab Brescia
SP- OManisa SP - A SP – Asia1
BZ 41.1% 37.9% 69.8% 83.0% 78.5%
outside BZ
45.6% 30.3% 76.0% 84.7% 78.2%
no differences at p≤0.05
Armenia
NSP- Ab Geo &
Brescia SP – Asia1
BZ 5.8% 73.7% *
outside BZ 5.8% 10.8% *
* differences atp≤0.05
Georgia
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… other possible associations
sheep/cattle ratio:
no association with NSP prev.(p>0.05)
p<0.05
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• introduction of FMDV or NSP positive animals from outside:– trade – contacts during seasonal grazing – wild and grazing animals crossing
borders
• unnoticed or unreported FMD• incorrect age data
Possible explanations of NSP situation
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NSP antibody results – regional -
0 %
> 0 - 20%
> 20 - 40 %
> 40 - 60 %
> 60 %
not sampled
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Regional FMD events 2004 – 2009
2005 20072004 2006
N.Karabakh; O PanAsia II
(ARRIAH)
2009
buffer z.:
3-15%
buffer z.:
10-58%
Arm/Azb 23-31%
NSP surveys(mean)
FMD diagnosis
Epidemics A Iran 05 O PanAsia II
Iran
Turkey
A Iran 05
Georgia; A serology,
clinical signs
2008
Geo 6% Arm/Azb: 3-11%
Nakh 1%
follow-up
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Conclusions
• Labs can perform good quality serology • Currently favourable FMD situation despite some outbreaks
rumors (localized & sporadic, mainly 2008)• Good vacc. coverage in Armenia (and probably in
Azb) but pockets of low SP occur• Virus circulation more associated with regional FMD situation
than with vaccination (Georgia)• Risk factors: seasonal pasture, spatial (?), SR ?, vaccination
compliance, movements
risk based control & surveill.: future assistance inFMD control with increased nat. responsibility