Table 1 Herd-level seroprevalence of bovine brucellosis based on several factors in Peninsular Malaysia between 2000 and 2008

Year

2000

1245

18.6

Ref

-

-

2001

1227

18.6

1.00

0.818–1.227

0.986

2002

1161

19.9

1.09

0.890–1.336

0.404

2003

1427

20.4

1.12

0.928–1.363

0.232

2004

1140

21.5

1.20

0.983–1.469

0.073

2005

934

22.4

1.27

1.026–1.561

0.028

2006

1289

22.1

1.25

1.026–1.513

0.026

2007

1249

26.8

1.61

1.331–1.945

0.001

2008

923

23.8

1.37

1.116–1.692

0.003

Month of sampling

January

476

17.2

Ref

-

-

February

729

19.2

1.1

0.839–1.532

0.415

March

1116

19.7

1.2

0.883–1.549

0.270

April

1264

18.8

1.1

0.839–1.459

0.475

May

1260

18.3

1.1

0.811–1.413

0.631

June

1241

22.2

1.4

1.038–1.792

0.026

July

1057

23.9

1.5

1.138–1.979

0.004

August

1106

21.5

1.3

0.990–1.726

0.059

September

762

24.9

1.6

1.186–2.115

0.002

October

667

27.7

1.8

1.366–2.451

0.001

November

502

25.3

1.6

1.182–2.206

0.003

December

418

22.7

1.4

1.008–1.951

0.045

States

Selangor

1553

20.9

Ref

-

-

Terengganu

545

18.5

0.9

0.671–1.102

0.232

Perlis

52

36.5

2.2

1.221–3.876

0.008

Perak

1935

19.2

0.9

0.761–1.062

0.212

Pahang

1318

43.6

2.9

2.475–3.454

0.001

Pulau Pinang

109

11.9

0.5

0.283–0.925

0.027

N. Sembilan

1171

14.4

0.6

0.520–0.781

0.001

Melaka

1016

10.8

0.5

0.364–0.579

0.001

Kelantan

663

28.1

1.5

1.196–1.816

0.001

Kedah

626

15.3

0.7

0.533–0.878

0.003

Johor

1607

19.3

0.9

0.759–1.075

0.251

Herd size

<20

4328

9.0

Ref

-

-

20–40

2101

27.5

3.1

2.660–3.510

0.001

>40

1891

69.2

7.7

6.794–8.731

0.001

Breed

Kedah-Kelantan

3291

27.7

Ref

-

-

Bali

25

36

1.5

0.648–3.342

0.356

Brahman

283

38.9

1.7

1.294–2.138

0.001

Kedah-Kelantan cross

3290

27.6

0.6

0.526–0.658

0.001

Local Indian Dairy

3849

18.4

0.7

0.599–0.818

0.001

Nellore

30

36.7

1.5

0.718–3.196

0.276

Sahiwal-Friesien

1078

12.9

0.4

0.319–0.470

0.001

Others

69

4.4

0.1

0.037–0.379

0.001

Type of production

Dairy

2333

17.2

Ref

-

-

Beef

7538

23.2

1.45

1.288–1.638

0.001