Ampicillin resistance profile of local Bacillus species isolated from Syrian soils


M. Harba, M. Jawhar


Volume 29, Issue 4;
Pages: 304-308; 2023
ISSN: 2069-0053 (print), Agroprint;
ISSN (online): 2068-9551


Antibiotic-resistant bacteria are one of the main global health problems that can affect humans, animals and environment. In this work, out of 525 isolates, 39 Bacillus strains, which represented six species as B. atrophaeus, B. subtilis, Paenibacillus polymyxa, B. amyloliquefaciens and B. tequilensis were in-vitro tested for ampicillin resistance on NA media, and profound inhibition of bacteria growth was observed 24 hours post incubation. The data indicated that resistance to ampicillin was species-related as B. subtilis, (N = 20; % 50), B. amyloliquefaciens, (N = 10; % 60), and B. atrophaeus (N = 3; % 33.3), B. poenibacillus (N = 2; % 0) and for B. tequilensis (N = 4; % 75). The percentage of zone inhibition of the Bacillus colonies ranged from 0 to 75 %, compared to the untreated control. However, 51% of tested Bacillus strains were not sensitive to ampicillin, suggesting the existence of potential risk for Bacillus spp. infections. The results of this study suggest that the Syrian Bacillus strains are variable in their susceptibility towards ampicilin, and the presence of resistant strains is of concern about how this resistance could spread to other bacteria, and then to humans.

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