## 3 Results and Discussion
The risk of bacterial contamination on dry surfaces is low because bacterial growth and survival are reduced. However, studies in dry conditions show that the viability of _S. aureus_ can represent a risk over long periods. In the case of _S. aureus_, it was observed that this bacterium survives in adverse conditions and has the ability to withstand dry environments [7; 53]. As such, in air-drying experimental conditions, _S. aureus_ represent a risk for at least 72 h [54]. [PERSON] & [PERSON] [55] noted that this bacterium survives more than 90 days on different surfaces. [PERSON] et al. [46] showed that surfaces containing triclosan have a better antibacterial protective effect against staphylococci strains in dry conditions than in humid ones. This is significant if we consider that the presence of bacterial pathogens on domestic surfaces, and in the food industry, is a hazard for re-contamination. The drying of the surfaces should not be ruled out after the sanitization process under practical conditions of use because bacterial propagation in a liquid medium is an essential element for the adherence \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Sample** & **Triclosan (ppm *)** & **Dry Condition** & **Humidity Condition** \\ \hline Id1 & 0 & \(0.74\pm 0.13\)\({}^{\text{a,A}}\) & \(0.34\pm 0.06\)\({}^{\text{a,B}}\) \\ Id2 & 400 & \(0.99\pm 0.42\)\({}^{\text{a,A}}\) & \(0.19\pm 0.02\)\({}^{\text{a,B}}\) \\ Id3 & 500 & \(0.68\pm 0.16\)\({}^{\text{a,A}}\) & \(0.25\pm 0.03\)\({}^{\text{a,B}}\) \\ Id4 & 650 & \(1.02\pm 0.16\)\({}^{\text{a,A}}\) & \(0.16\pm 0.01\)\({}^{\text{a,B}}\) \\ Id5 & 850 & \(1.17\pm 0.39\)\({}^{\text{a,A}}\) & \(0.20\pm 0.02\)\({}^{\text{a,B}}\) \\ \hline \hline \end{tabular} \({}^{\text{a,B}}\) Reduction values (means \(\pm\) s.d.) in the same column with different letters are significantly different (\(p<0.05\)). \({}^{\text{a,B}}\) Reduction values (means \(\pm\) s.d.) in the same file (capital letters) with different letters are significantly different (\(p<0.05\)). (*) Parts per million concentrations. CFU: colony-forming units.  
\end{table} 
Table 1: Bacteriostatic activity (reduction values depicted in log\({}_{10}\) CFU/cm\({}^{2}\)) of polyester surfaces in _S. aureus_ treated with triclosan (400 ppm to 850 ppm) and tested under dry and humid conditions. and possible formation of biofilms. Likewise, a drying surface is a procedure that minimizes the proliferation of microorganisms; however, it has been observed that _S. aureus_ can survive in dry conditions and its viability represents a risk over a long period. Therefore, the use of materials with antimicrobial properties should be considered for controlling the spread of this bacterium in different food processing environments. The objective of antimicrobial agents is to prevent the proliferation of microorganisms and thus, control bacterial adhesion and biofilm formation. This study tested the bacterial inhibition on surfaces to evaluate the concentrations of surfaces that incorporate antimicrobials. Moreover, these surfaces were immersed in TSA agar for 24 h at 37 \({}^{\circ}\)C, demonstrating the presence (or not) of a biocidal compound and its concentration (Figure 1). Our results showed that the surfaces used as control (Id1) i.e., not previously treated with triclosan (0 ppm), and tested under dry conditions, formed bacterial colonies of _S. aureus_ (Figure 1a). In contrast, the surfaces containing triclosan (Id2) incubated under the humid condition showed bacterial inhibition (Figure 1b). According to the microscopy results (Table 2), there was a development of live bacterial cells on the surfaces used as the control under dry and humid conditions (\(1.63\times 10^{5}\) and \(1.47\times 10^{6}\), respectively) (Figure 1c). In comparison with the surfaces used as the control, in the active concentrations (Id2 to Id5), live cells did not develop under dry conditions and showed low counts in Id2 and Id3 under humid conditions (\(p<0.05\)) (Figure 1d).