Hand Sanitizer: Kills Germs & Fungus

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In the quest for cleanliness, hand sanitizers have become a staple in our daily lives, especially in light of the COVID-19 pandemic. But how effective are they against fungi, and can they truly kill fungus? Let's delve into the science behind hand sanitizers and their antifungal properties.

Understanding Hand Sanitizers

Hand sanitizers are alcohol-based gels or liquids that kill bacteria and viruses on contact. They typically contain between 60% and 95% alcohol, with the most common types being ethanol, isopropyl alcohol, or n-propanol. The Centers for Disease Control and Prevention (CDC) recommends using hand sanitizers with at least 60% alcohol to effectively kill germs.

Do Hand Sanitizers Kill Fungi?

While hand sanitizers are highly effective against bacteria and viruses, their efficacy against fungi is less clear-cut. Fungi, unlike bacteria and viruses, are eukaryotic organisms and have a more complex structure. They have a cell wall composed of chitin, which makes them more resistant to certain disinfectants.

Alcohol-based hand sanitizers primarily work by denaturing proteins, which can kill bacteria and viruses. However, fungi have a higher tolerance to alcohol. Studies have shown that while alcohol-based hand sanitizers can reduce the number of fungi on hands, they may not entirely eliminate them, especially in higher concentrations.

Alcohol Concentration Matters

The concentration of alcohol in hand sanitizers plays a significant role in their antifungal properties. Higher alcohol concentrations (above 70%) have been shown to have greater antifungal activity. However, it's important to note that while higher concentrations may be more effective, they can also cause skin irritation and dryness with prolonged use.

Alternative Antifungal Agents in Hand Sanitizers

Some hand sanitizers contain additional ingredients that can enhance their antifungal properties. These include:

• Hibiscrub: An antiseptic that has shown promising antifungal activity, particularly against Candida species.
• Chlorhexidine: A broad-spectrum antiseptic that can kill bacteria, viruses, and fungi. It's often used in combination with alcohol in hand sanitizers.
• Triclosan: An antimicrobial agent that has some antifungal properties. However, its use has been controversial due to potential health and environmental concerns.

When to Use Hand Sanitizers and When to Wash with Soap

Hand sanitizers are convenient and effective when soap and water aren't available. However, they should not replace thorough handwashing with soap and water. Soap is more effective at removing fungi from hands due to its ability to disrupt the fungal cell wall. Hand sanitizers, on the other hand, are best used as a supplement to handwashing, not as a replacement.

In conclusion, while hand sanitizers can reduce the number of fungi on hands, their efficacy is not as high as against bacteria and viruses. Higher alcohol concentrations and additional antifungal agents can enhance their antifungal properties. However, thorough handwashing with soap and water remains the gold standard for fungal removal. Always remember, cleanliness is key, and choosing the right method is crucial for maintaining optimal hand hygiene.

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