Table 1.

Total frequency and percentage of bacterial infections isolated from eight selected studies that cause bovine mastitis.

No.	Bacterial isolates	Frequency	Percentage	Included studies
1.	Staphylococcus species	578	48.20	Almaw et al. 2008 [20], Mekibib et al. 2010 [26], Abera et al. 2012 [27], Mulugeta and Wassie, 2013 [28], Herago et al. 2017 [29], Melesse and Minyahil, 2019 [30], Abebe et al. 2020 [31], Fesseha et al. 2021 [32]
2.	Coagulase-negative staphylococci	210	17.50	Almaw et al. 2008 [20], Mekibib et al. 2010 [26], Herago et al. 2017 [29], Melesse and Minyahil, 2019 [30], Fesseha et al. 2021 [32]
3.	Streptococcus species	153	12.76	Almaw et al. 2008 [20], Mekibib et al. 2010 [26], Abera et al. 2012 [27], Herago et al. 2017 [29], Melesse and Minyahil, 2019 [30], Abebe et al. 2020 [31], Fesseha et al. 2021[32]
4.	Escherichia coli	135	11.30	Mekibib et al. 2010 [26], Abera et al. 2012 [27], Mulugeta and Wassie, 2013 [28], Herago et al. 2017 [29], Melesse and Minyahil, 2019 [30], Abebe et al. 2020 [31], Fesseha et al. 2021[32]
5.	Bacillus species	39	3.25	Almaw et al. 2008 [20], Mekibib et al. 2010 [26], Abera et al. 2012 [27], Melesse and Minyahil, 2019 [30], Abebe et al. 2020 [31]
6.	Klebsiella pneumoniae	30	2.50	Mekibib et al. 2010 [26], Abera et al. 2012 [27], Melesse and Minyahil, 2019 [30]
7.	Corynebacterium species	19	1.58	Almaw et al. 2008 [20], Mekibib et al. 2010 [26], Mulugeta and Wassie, 2013 [28]
8.	Enterobacter species	16	1.33	Mekibib et al. 2010 [26], Abera et al. 2012 [27], Melesse and Minyahil, 2019 [30]
9.	Micrococcus species	15	1.25	Almaw et al. 2008 [20], Mekibib et al. 2010 [26], Abera et al. 2012 [27]
10.	Pseudomonas species	3	0.25	Abera et al. 2012 [27]
11.	Arcanobacterium pyogenes	1	0.08	Almaw et al. 2008 [20]