Thymol: a novel eco-friendly defense against biological threats

Thymol is an essential oil known for its antimicrobial properties. Our study explored itspotential as an antibacterial agent effective against both Gram-positive and Gram-negative bacteria. The ultimate goal is to investigate how thymol could be applied in thecontext of public health and emergency biodefence as a natural, safe, and effectivecompound.We performed in vitro experiments using two standard methods:MIC (Minimum Inhibitory Concentration)MBC (Minimum Bactericidal Concentration)We compared thymol’s activity with that of other essential oils: carvacrol, eugenol, andmenthol.The core of our research focused on a killing test to evaluate the rapid bactericidalactivity of thymol against three key bacterial strains: Escherichia coli (Gram-negative),Staphylococcus aureus (Gram-positive), Bacillus clausii, a non-pathogenic surrogate forBacillus anthracis, the bacterium responsible for anthrax.Our findings were striking: within just 5 minutes of incubation, thymol exhibited 100% bactericidal activity, even at low concentrations. This highlights its strong potential as arapid-response antimicrobial in biodefence and public safety contexts.The results obtained with Bacillus clausii are especially significant, suggesting thatthymol could be considered a viable alternative or complement to conventionaltreatments in case of bioterrorism events or natural outbreaks involving high-riskpathogens.