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Five medicinal plants used by traditional medical health practitioners (TMP) in Meru central district namely: Piliostigma thonningii, Ajuga remota, Ocimum suave, Erythrina abyssinica and Harissonia abyssinica were investigated for their antibacterial activity against standard bacterial cultures namely; Staphylococcus aureus, Bacillus cereus, Escherichia coli and Pseudomonas aeruginosa . The antibacterial activity of the methanolic and water extracts was determined using the minimum bactericidal concentration (MBC) and minimum inhibitory concentration (MIC). Gram positive bacteria ( S. aureus and B. cereus ) were more susceptible to the plant extracts than Gram negative bacteria ( E. coli and P. aeruginosa ). The MIC and MBC of the positive control antibiotics (Ampicillin for gram positive and Gentamycin for gram negative) were less than 1mg/ml. The most susceptible bacteria was S. aureus followed by B. cereus while the most resistant was E. coli followed by P.aeruginosa . Methanolic extracts of P. thonningii stem and Ocimum suave leaves had the best antibacterial activity against the four bacterial species. There was no significant difference between the water and methanolic extracts of all the plants. These results justify the use of these plants by the traditional medical practitioners for management of bacterial conditions and further investigation on their safety and phytochemistry is needed.

Cases of poisoning encountered naturally in smallholder farms in Nairobi and its environs