3.2. Antibacterial Activity. The results of the study indicated that only two of the crude solvent extracts prepared from the leaves of Psidium guajava, methanol and ethanol, showed inhibitory activity against bacteria (Table 2). Only Gram-positive bacteria, Bacillus cereus and Staphylococcus aureus, were susceptible to the two extracts, while neither of the Gram-negative bacterium showed any inhibition. At 10 mg/50