## 3 Results
### Antibacterial Activity  
The antibacterial activity of the different blueberry and cherry extracts was tested using several Gram-positive and Gram-negative bacteria. The evaluation of the activity of various extracts revealed varying behaviour among the analysed extracts and a diverse response among the examined strains (Table 4). In the case of the blueberry extract of the non-coloured fraction, _B. cereus_ ATCC 11778 was the most resistant strain, with a MIC value of more than 4 mg mL\({}^{-1}\) for both cultivars, whereas the most susceptible strain was _K. pneumoniae_ ATCC 13883 of cv. Legacy with a concentration of 0.12 mg mL\({}^{-1}\) inhibiting growth. The coloured fraction of blueberry fruits extract exhibited higher inhibitory activity, with _L. monocytogenes_ LMG 16779 and _S. aureus_ ATCC 25923 having the maximum susceptibility to an inhibitory concentration of 0.12 mg mL\({}^{-1}\), followed by _K. pneumoniae_ ATCC13883 and _A. baumannii_ LMG 1025 exhibiting susceptibility to a concentration of 0.25 mg mL\({}^{-1}\). However, the strain _B. cereus_ ATCC 11778 was not inhibited by the doses tested. The total extract did not suppress the growth of _B. cereus_ ATCC 11778 at any concentration; however, _E. faecalis_ ATCC 29212 and _P. mirabilis_ CECT 170 were inhibited at concentrations of 2 mg mL\({}^{-1}\). In terms of sweet cherry extracts, the acquired findings revealed that _S. aureus_ ATCC 25923 was the most sensitive strain to the coloured fraction of cherries from cv. Sweetheart and cv. Saco, with MIC values of 1 mg and 2 mg mL\({}^{-1}\), respectively. However, all other tested extracts had MIC values greater than 2 mg mL\({}^{-1}\) for all studied strains (Table 4). Moreover, Gram-positive bacteria are more sensitive to blueberry extracts, exhibiting inhibition in lower concentrations than Gram-negative but not in cherry extracts, where observed activities were similar or higher in Gram positive bacteria. \begin{table}
\begin{tabular}{l c c c c c c c c c c c c c c c} \hline  & \multicolumn{6}{c}{**Blueberry Extracts**} & \multicolumn{6}{c}{**Sweet Cheary Extracts**} & \multicolumn{6}{c}{**Control**} \\ \cline{2-13}  & \multicolumn{3}{c}{**cv. Legacy**} & \multicolumn{3}{c}{**cv. Duke**} & \multicolumn{3}{c}{**cv. Sweetheart**} & \multicolumn{3}{c}{**cv. Saco**} & \multicolumn{3}{c}{**Control**} \\ \cline{2-13}  & \multicolumn{3}{c}{**Non-**} & \multicolumn{3}{c}{**Coloured**} & \multicolumn{1}{c}{**Total**} & \multicolumn{1}{c}{**Coloured**} & \multicolumn{1}{c}{**Total**} & \multicolumn{1}{c}{**Non-**} & \multicolumn{1}{c}{**Coloured**} & \multicolumn{1}{c}{**Total**} & \multicolumn{1}{c}{**Non-**} & \multicolumn{1}{c}{**Coloured**} & \multicolumn{1}{c}{**Total**} & \multicolumn{1}{c}{**Coloured**} & \multicolumn{1}{c}{**Total**} & \multicolumn{1}{c}{**Control**} \\  & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} & \multicolumn{3}{c}{**Fraction**} \\ \hline Gram-positive & \(E\)_frontal_ & 2212 & 1 & 1 & 2 & 0.5 & 0.5 & nd & nd & nd & nd & nd & nd & nd & 0.016 \\
2 & \(E\)_frontal_ & 3-4 & 4 & 4 & 4 & 4 & 4 & 3-2 & 2-2 & 2-2 & 2-2 & 2-2 & 2  
The use of berry extracts has been previously studied mainly due to their phenolic compound contents [79]. The search for new molecules with antibacterial activity is required owing to the increase in antibiotic resistance in pathogenic bacteria, such as _A. buumanni, L. monocytogenes,_ and _K. pneumoniae_, according to the most recent reports of the World Health Organization [42].