Antibacterial Effects of Cissus welwitschii and Triumfetta welwitschii Extracts against Escherichia coli and Bacillus cereus

Table 1

Zones of inhibition produced after exposure of bacteria to plant extracts and antibiotics. The zone of inhibition refers to the diameter of the circle in which no growth of cells was observed, minus the diameter of the filter paper disk (6 mm). The assay was conducted twice.

Plant extract/antibiotic	B. cereus zone of inhibition (mm)	E. coli zone of inhibition (mm)
C. welwitschii leaf methanol	2.5 ± 0.6	1.3 ± 0.5
C. welwitschii leaf water	0	0
C. welwitschii root methanol	0.8 ± 0.29	0.5 ± 0.0
T. welwitschii leaf methanol	3.3 ± 0.5	2.3 ± 0.5
T. welwitschii leaf water	0	0
T. welwitschii root methanol	6 ± 0	4.5 ± 1.2
T. welwitschii root water	1.8 ± 0.5	2 ± 0.6
Ampicillin	9 ± 0.0	12 ± 0.8
Methanol	0	0
Distilled water	0	0