This investigation was carried out to evaluate the collaborative antimicrobial effects of the Alliaceae family's culinary spices, Allium cepa and Allium sativum. Eight test isolates were screened out from over forty organisms, sourced from environmental samples, using standard microbiological methods. The test isolates were subjected to antibacterial analyses using commercially available antibiotics and ethanoic crude extracts from Allium sativum and Allium cepa leaves, to ascertain their individual and synergistic effects. Biochemical tests revealed the test isolates as Staphylococcusaureus (15.8%); Escherichia coli (5.3%); Shigella sonnei (15.8%); Aeromonas species (10.5%); Clostridium species (15.8%); Corynebacterium xerosis (21.1%); Bacillus species (10.5%); and Streptococcus species (5.3%). All tested extracts showed varying sensitivities against the test organisms. In tests with individual extracts, red garlic extract (16 mm) demonstrated the largest zone of inhibition against Aeromonas species, whereas white onion extract (4 mm) revealed the lowest zone of inhibition against Bacillus species. Similarly, the highest inhibition zone (30 mm) was produced by the pooled extracts of both red onion and red garlic against Streptococcus species. Of all test isolates, Bacillus species showed overall susceptibility to the various combinations of extracts used. The study concluded that the synergistic effects of Allium cepa and Allium sativum have a greater antimicrobial effect than individual extracts, and this effect is not general to all organisms but specific ones. The crude extracts also proved more potent than conventional antibiotics. Further research work was recommended on the antimicrobial effects of other members of the Allium family.
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