Evaluation of an Indirect-ELISA Test for Trypanosoma evansi Infection (Surra) in Buffaloes and Its Application to a Serological Survey in Thailand
Table 1
Results of the buffalo serological survey by indirect-ELISA in 8 provinces of Thailand.
Region
Provinces
Census 2009
AP (%)
TP (%)
PF (%)
PiF (%)
(95% CI)
(95% CI)
North
Maehongson
23,761
100
18
18
13.6
38.1
39.2
(11.7–26.7)
(6–23.4)
Northeast
Buriram
105,177
138
17
12.3
7.3
30.4
44.9
(7.8–18.8)
(1.9–14.7)
Roi Et
70,23
81
11
13.6
8.7
17.1
64.3
(7.8–22.7)
(1.7–18.7)
Sakon Nakhon
75,647
208
27
13.0
8
18
79.7
(9.1–18.2)
(3.5–13.8)
Sisaket
98,427
59
1
1.7
0
4.5
100.0 (1 infected)
(0.3–9)
(0–3.3)
Surin
120,886
73
7
9.6
4.2
25
45.7
(4.7–18.5)
(0–14.1)
Ubon Ratcha.
136,528
138
6
4.3
0
10.8
47.2
(2–9.2)
(0–7.6)
South
Songkhla
4,431
95
22
23.2
19.4
71.4
29.2
(15.8–32.6)
(10.8–29.8)
Total
635,087
892
109
12.2
7.2
20.3
55.7
(10.2–14.5)
(4.9–9.8)
: number of serum samples tested. : number of seropositive samples by indirect-ELISA. CI: confidence interval. AP: apparent seroprevalence rate per province (AP = ). TP: true prevalence estimates. PF: percentage of infected farms (at least one seropositive sample). PiF: mean seroprevalence rate on infected farms.
