Table 4 Antibacterial activity of Z.zerumbet extracts (three month leaf and nine month rhizome and stem) and antibiotics against bacterial strains

8.7 ± 0.291^a

7.3 ± 0.337^b

6.5 ± 0.277^c

7.3 ± 0.276^b

5.1 ± 0.188^c

5.9 ± 0.121^a

5.6 ± 0.114^b

4.8 ± 0.129^d

1.0 ± 0.164^d

1.8 ± 0.367^c

4.0 ± 0.127^ab

4.2 ± 0.119^a

1.5 ± 0.146^c

3.5 ± 0.322^b

5.4 ± 0.318^a

5.5 ± 0.337^a

4.1 ± 0.267^d

5.3 ± 0.379^c

7.2 ± 0.272^a

6.8 ± 0.252^b

5.6 ± 0.218^c

7.0 ± 0.381^a

6.2 ± 0.365^b

6.7 ± 0.322^a