Background: One of the most common gastrointestinal infections is Helicobacter pylori infection, which leads to gastritis, gastrointestinal ulcers, and eventually stomach cancer. Many chemical drugs are used to eradicate this bacterium; however, resistance to many drugs and recurrence of infection are some treatment problems. Among these, the role of herbal medicines is very important. Glycyrrhiza glabra and Salvia officinalis are some plants used to treat H. pylori infections. These plants grow in different regions of Iran, and it is important to study their effects on this bacterium. Objectives: Accordingly, this study aimed to isolate H. pylori strains and investigate the antimicrobial effects of G. glabra and S. officinalis ethanolic extract against this bacterium. Methods: H. pylori specimens were isolated from endometrium biopsy of the stomach of patients who referred to Sistan and Baluchestan Hospital by culture method. Then, the antimicrobial effects of the ethanolic extracts of G. glabra and S. officinalis were investigated on H. pylori isolates by microdilution method. Results: The results of this study showed that 30 (60%) cases were metronidazole-resistant, 15 (30%) were amoxicillin-resistant, 12 (24%) were tetracycline-resistant, and 2 (4%) were clarithromycin-resistant. While the lowest minimum inhibitory concentration (MIC) of G. glabra ethanolic extract against H. pylori was 3.1 mg/ml (five strains were inhibited), the highest minimum bactericidal concentration (MBC) was equal 100 mg/ml (six strains were inhibited). The lowest MIC of S. officinalis against H. pylori was equal 3.1 ppm (12 strains were inhibited), while the highest MBC was 50 ppm (one strain was inhibited). Conclusions: According to our results, G. glabra and S. officinalis ethanolic extracts had high antibacterial activity against antibiotic-resistant strains. Regarding the continuous and reckless use of chemical drugs, unfortunately, increasing drug resistance in germs is increasing compared to chemical drugs day by day, as a result, be used from medicinal herbs. On the other hand, as the environment (weather and soil area) is effective in the type and amount of phytochemical substances, therefore, it is suggested that when using a medicinal plant for the treatment of diseases, should be addressed to the location of the plant and the type of tissue of the plant to achieve the best Therapeutic effect.

Background: Because many plant extracts have a significant inhibitory effect on pathogenic microorganisms, so we aimed to evaluate the antioxidant and antimicrobial activity of some plant extracts on Bacillus cereus isolated from soil. Methods: The chicory (Cichorium intybus L.), hyacinth (Hypericum perforatum L.), lavender (Lavandula angustifolia), yew (Taxus baccata), and thyme (Thymus vulgaris L.) plants were collected and identified in the botanical laboratory of the University of Zabol. To prepare the ethanolic extract, 40 g of dried leaves of plants were used in 400 cc of ethanol. Different strains of B. cereus used in this study were isolated from soil and identified by biochemical, bacteriological, and growth tests as well as standard tests. Antimicrobial effects were investigated by diffusion method in Müller Hinton agar medium using 6 mm paper discs according to Bauer and Kirby instructions as well as microdilution. Statistix ver10 software was used for statistical calculations. Mean comparisons were performed using the LSD at the 1% level, and Excel was also used to draw the figures. Results: The diameter of the growth inhibition zone of plant extracts against B. cereus at a dilution of 100 ppm was investigated, and it was found that different extracts had different effects on inhibiting the growth of B. cereus (P < 0.01). LSD test showed that thyme (T. vulgaris L.) had the highest (15 mm) effect on growth inhibition of strains 2 and 3 of B. cereus and the lowest (1 mm) effect on growth inhibition of strain 1 of B. cereus. The lowest MIC and MBC of thyme (T. vulgaris L.) against B. cereus samples were 3.1 and 6.2 ppm, respectively. Conclusions: Considering the side effects of chemical drugs and antibiotics, as well as the potential effect of medicinal plant extracts, especially T. vulgaris L. on B. cereus, it is recommended that T. vulgaris L. may inhibit the growth of B. cereus.

Background: This study was done to investigate the antimicrobial activity of rosemary and olive extracts on antibiotic-resistant Escherichia coli isolated from quail feces in Zabol city. Methods: Ethanolic and methanolic extracts of rosemary (leaf) and olive (leaf) plants were prepared using a rotary apparatus. Also, E. coli strains were isolated from poultry feces samples, the minimum inhibitory concentration and the minimum bactericidal concentration were determined by the microdilution method. Results: The lowest values of MIC and MBC against E. coli were 12.5 ppm and 25 ppm for rosemary ethanolic extract and 25 ppm and 50 ppm for rosemary methanolic extract, respectively. The lowest values of MIC and MBC against E. coli were 12.5 ppm and 25 ppm for olive ethanolic extract and 6.25 ppm and 12.5 ppm for olive methanolic extract, respectively. Conclusions: In general, methanol solvent and olive extract are highly effective against E. coli. Due to the obtained results and increasing resistance of bacteria to chemical antibiotics, it is suggested that with further studies on olives and the use of methanol solvent in the extraction of plant extracts, antibacterial compounds of olives and other plants be used in the treatment of bacterial infections.