Battling the Highly Contagious Norovirus: What Kills It in Your Laundry?
Norovirus, often dubbed the "stomach flu," is a formidable and highly contagious virus that can easily spread through contaminated surfaces, food, and yes, even laundry. When someone in your household is sick with norovirus, or if you suspect contamination, tackling your laundry effectively is crucial to prevent further spread. But what exactly kills this resilient pathogen on your clothes, linens, and towels?
Understanding Norovirus's Resilience
Norovirus is known for its toughness. It can survive for extended periods on surfaces, including fabrics, and is not easily killed by typical washing cycles or common household disinfectants alone. This resilience means that simply tossing infected laundry into the washing machine with regular detergent might not be enough to neutralize the virus.
The Power of Heat: Hot Water is Your Ally
One of the most effective weapons against norovirus in laundry is heat. Norovirus is inactivated by high temperatures. Therefore, washing clothes and linens that may be contaminated with norovirus in the hottest water setting available on your washing machine is a critical step.
Recommended Water Temperatures
For effective inactivation, aim for water temperatures of at least 131°F (55°C). Many standard washing machines have a "hot" or "sanitize" cycle that can reach these temperatures. Always check your washing machine's manual for specific temperature capabilities.
Why is hot water so important? High temperatures disrupt the norovirus particle, damaging its outer shell and rendering it unable to infect. Cold water alone is generally insufficient to kill the virus.
The Role of Detergent and Bleach
While hot water is paramount, it's not the only line of defense. The right detergent and, in some cases, bleach can further enhance your efforts.
Detergent's Contribution
A good quality laundry detergent helps to physically remove viral particles from fabric. It emulsifies oils and dirt, carrying the virus away with the wash water. While detergent alone may not kill norovirus, it's an essential part of the cleaning process.
When to Use Bleach
For items that can tolerate it, chlorine bleach is a powerful disinfectant that effectively kills norovirus. However, not all fabrics can withstand bleach, and it's crucial to check care labels before adding it to your wash.
- For white or colorfast items: Use about 1/2 cup of chlorine bleach per gallon of water for soaking or add it directly to the bleach dispenser of your washing machine (follow your washing machine's instructions).
- For colored items or those that can't tolerate bleach: Consider using a bleach alternative, such as an oxygen-based bleach. While generally less potent than chlorine bleach, they can still offer some disinfecting properties when used in conjunction with hot water.
Important Note: Never mix bleach with ammonia or other cleaning products, as this can create dangerous fumes. Ensure good ventilation when using bleach.
The Drying Process: Don't Forget the Heat!
After washing, the drying process is another opportunity to eliminate any remaining norovirus particles. High heat in the dryer is also effective in inactivating the virus.
Recommended Drying Settings
Run your clothes and linens through a hot dryer cycle for an adequate amount of time. The heat from the dryer will further kill any surviving viral particles. Again, check care labels to ensure the fabrics can withstand high heat drying.
Specific Recommendations for Laundry When Someone is Sick
When dealing with a norovirus outbreak in your home, it's best to follow these specific steps:
- Handle Soiled Laundry Carefully: Wear disposable gloves when handling potentially contaminated laundry. Avoid shaking soiled items, as this can aerosolize the virus.
- Wash Immediately: Wash contaminated laundry as soon as possible. Don't let it sit for extended periods.
- Wash Separately: If possible, wash the sick person's laundry separately from the rest of the household's laundry. This minimizes the risk of cross-contamination.
- Use the Hottest Water Setting: As mentioned, use the hottest water setting your washing machine allows, ideally 131°F (55°C) or higher.
- Add Detergent: Use a regular laundry detergent.
- Consider Bleach: If the fabric is bleach-safe, add chlorine bleach according to the manufacturer's instructions for disinfecting.
- Dry on High Heat: Transfer the wet laundry directly to the dryer and use the hottest setting for a full cycle.
- Clean the Washing Machine: After washing contaminated items, it's a good idea to run an empty hot water cycle with bleach in your washing machine to disinfect it.
What About Delicate Items?
For delicate items that cannot be washed in hot water or dried on high heat, the situation is more challenging. In such cases, you may need to:
- Spot Treat with Disinfectant: For small areas of contamination, consider spot-treating with a disinfectant spray specifically approved for fabrics (always test in an inconspicuous area first).
- Consider Professional Cleaning: For heavily soiled or critical items, professional dry cleaning might be an option, though it's important to inform the cleaner about the potential norovirus contamination.
- Discard if Heavily Contaminated: In extreme cases, if an item is heavily contaminated and cannot be safely disinfected, discarding it might be the safest option.
Frequently Asked Questions (FAQ)
How hot does the water need to be to kill norovirus in laundry?
The water temperature needs to be at least 131°F (55°C) to effectively inactivate norovirus. Using the hottest setting on your washing machine is recommended.
Why is bleach so effective against norovirus?
Chlorine bleach is a broad-spectrum disinfectant that works by oxidizing and denaturing the proteins and genetic material within the norovirus particle, rendering it inactive and unable to cause infection.
Can I just use a regular laundry detergent to kill norovirus?
While regular laundry detergent is essential for physically removing viral particles, it is generally not sufficient on its own to kill norovirus. A combination of hot water, detergent, and potentially bleach is needed for effective disinfection.
What if I don't have a hot water setting on my washing machine?
If your washing machine does not have a reliable hot water setting, focus on using the hottest water possible, maximizing the wash time, and using a bleach-safe cycle if appropriate. For heavily contaminated items, consider using a laundromat with advanced sanitizing cycles or soaking in a disinfectant solution if the fabric allows.
How long can norovirus survive on clothes?
Norovirus can survive on fabric for days or even weeks under the right conditions. This is why proper disinfection of laundry is so important, especially after someone has been sick.
