Table 2.

National prevalence of brucellosis for different domestic animals in Nigeria (2001–2021).

Animal	Variable	The Six Geopolitical Zones in Nigeria						Total Nationwide	National Prevalence %	Odd Ratio	95% CL	Z Statistics	p-Value	Number of Publications
		NC	NE	NW	SE	SS	SW
Cattle	Sample screened	3213	5253	19,648	1567	369	12,458	42,508	12.2%	0.1390	0.1346 to 0.1435	120.853	<0.0001	43
	+ ve samples	277	1154	2617	51	151	937	5187
	Regional prevalence	8.6%	22%	13.3%	3.3%	40.9%	7.5%
Donkey	Sample screened	0	2101	0	0	0	0	2101	10.2%	0.2427	0.2046 to 0.2879	16.247	<0.0001	4
	+ ve samples	0	215	0	0	0	0	215
	Regional prevalence	0%	10.2%	0%	0%	0%	0%
Camel	Sample screened	0	1267	1192	0	0	0	2459	20.9%	0.2024	0.1796 to 0.2281	26.196	<0.0001	5
	+ ve samples	0	398	116	0	0	0	514
	Regional prevalence	0%	31.4%	9.7%	0%	0%	0%
Horse	Sample screened	86	100	400	402	0	0	988	10.7%	0.0941	0.0729 to 0.1214	18.190	<0.0001	8
	+ ve samples	24	16	54	12	0	0	106
	Regional prevalence	27.9%	16%	13.5%	3%	0%	0%
Goat	Sample screened	2134	831	2191	340	0	2813	8309	10.2%	0.1013	0.0931 to 0.1102	53.357	<0.0001	20
	+ ve samples	410	75	303	12	0	46	846
	Regional prevalence	19.2%	9%	13.8%	3.5%	0%	1.6%
Sheep	Sample screened	1308	57	2449	0	0	94	3908	23.3%	0.2831	0.2569 to 0.3119	25.465	<0.0001	22
	+ ve samples	322	14	562	0	0	14	912
	Regional prevalence	24.6%	24.6%	22.9%	0%	0%	14.9%
Pig	Sample screened	369	0	0	351	55	200	975	18.7%	0.1731	0.1420 to 0.2110	17.371	<0.0001	5
	+ ve samples	125	0	0	2	55	0	182
	Regional prevalence	34%	0%	0%	0.6%	100%	0%
Chicken	Sample screened	275	730	0	410	0	140	1555	8.4%	0.0298	0.0213 to 0.0417	20.498	<0.0001	3
	+ ve samples	10	18	0	14	0	5	47
	Regional prevalence	3.6%	2.5%	0%	3.4%	0%	3.6%
Dog	Sample screened	492	374	200	123	0	1102	2291	19.4%	0.2337	0.2037 to 0.2680	20.767	<0.0001	8
	+ ve samples	115	76	43	34	0	176	444
	Regional prevalence	23.4%	20.3%	21.5%	27.6%	0%	16%

NC: North-Central, NE: North-East, NW: North-West, SE: South-East, SS: South-South, SW: South-West.