Antibacterial effects of Eucalyptus globulus leaf extract on pathogenic bacteria isolated from specimens of patients with respiratory tract disorders

Abstract

The antibacterial activity of Eucalyptus globulus leaf extract was determined for 56 isolates of Staphylococcus aureus, 25 isolates of Streptococcus pyogenes, 12 isolates of Streptococcus pneumoniae and seven isolates of Haemophilus influenzae obtained from 200 clinical specimens of patients with respiratory tract disorders. MIC50s for these species were 64, 32, 16 and 16 mg/L, respectively; MIC90s were 128, 64, 32 and 32 mg/L, respectively; and MBCs were 512, 128, 64 and 64 mg/L, respectively. These results suggest that further studies to clarify the possible therapeutic role of E. globulus leaf extract in the treatment of respiratory tract infection are warranted.

Antibacterial activity of the essential oils from the leaves of Eucalyptus globulus against Escherichia coli and Staphylococcus aureus

“…These results are almost similar to those shown by other works on the antimicrobial activity of essential oil of E. globulus leaves as well as those of similar species [14,[21][22][23][24][25][26][27][28][29] , and confirms its traditional uses [26,30,31] .…”

“…A suspension of each sample tested microorganism diluted prior to 10-1, 10-2 and 10-3 (1 mL of 10 8 cells /mL) was spread on a solid agar medium in Petri dishes (Mueller-Hinton agar). Filter paper discs (6 mm in diameter) were soaked in 13 毺L of the essential oil and placed on the inoculated plates and allowed to dry for 15 min, then incubated at 37 曟 for 24 h. The diameters of the inhibition zones were measured in millimeters [19] .…”

“…The control was prepared by mixing 1 mL of distilled water with 9 mL of alcohol solution. 1 mL of each dilution and 0.5 mL of tested culture strains are added to 8 mL of a nutrient broth, maintained after in a Marie bath at 37 曟 under stirring for 24 h, then seeded by streaking the surface of the agar medium and incubated at 37 曟 for 24 h. globulus leaves against S. aureus, using the agar disc diffusion method. The results revealed that the essential oil showed antibacterial activity with varying magnitudes, depending on the size of inoculums and the concentration of essential oil.…”

Respofeed as the Replacement of Antibiotic in the Treatment of Complicated Chronic Respiratory Disease (Ccrd).

“…All growth parameters were best with the group 4 which was treated with Respofeed. The present study was akin to the findings of [20,21,22,23], who reported that volatile oils helps to treat CRD, improve body weight gain and reduces lesion scores. …”

“…The effect of volatile oils in clearing of respiratory signs was investigated by [17,18,19,20,21,22] . [23] were infected with MG and no treatment was provided to the bird (Table 1 and Figure 1).…”