Nasal rinsing offers relief for excessive sinus drainage caused by colds, the flu, allergies, and various respiratory issues. However, a recent study suggests that using unsterilized tap water in neti pots may pose a risk of contracting a rare but potentially fatal brain infection.
Main points to take note of:
- Misconception about Tap Water Safety: Despite widespread belief, tap water isn’t safe for nasal irrigation due to potential contaminants like bacteria, parasites, and chemicals. Many people assume that because tap water is suitable for drinking, it’s also safe for nasal rinsing. However, this is incorrect. The nasal passages are more sensitive and vulnerable to infection than the digestive system. Therefore, using untreated tap water for nasal irrigation can lead to severe health problems.
- Health Risks of Using Untreated Water: Acanthamoeba is a type of amoeba found in water sources like tap water, rivers, lakes, and soil. When introduced into the nasal passages through nasal rinsing, it can cause a rare but serious infection called acanthamoeba keratitis. This infection can lead to severe complications, including vision loss and, in extreme cases, death. Individuals with weakened immune systems are particularly susceptible to such infections. In the mentioned case, ten people with compromised immune systems developed acanthamoeba infections after nasal rinsing, resulting in three deaths. This highlights the critical importance of using sterilized water for nasal irrigation to prevent such tragedies.
- Necessity of Sterilized Water: To avoid the risk of infection, it’s crucial to use sterilized water for nasal rinsing. Sterilization methods include boiling tap water or using distilled bottled water. Boiling tap water kills harmful microorganisms, making it safe for nasal irrigation. Similarly, distilled bottled water undergoes a process that removes impurities, making it suitable for nasal use. Using sterilized water ensures that there are no harmful bacteria, parasites, or chemicals that can cause infections or other health issues. Therefore, individuals should always follow guidelines for proper water sterilization when performing nasal irrigation to safeguard their health.
Nasal rinsing, also known as nasal irrigation, is a widely practiced method for clearing the sinuses, typically using a neti pot or squeeze bottle. However, the use of unsanitized tap water for nasal rinsing can significantly raise the risk of contracting rare but potentially fatal infections.
In recent years, there have been several cases of fatal infections caused by the brain-eating amoeba Naegleria fowleri, leading to increased awareness of the dangers associated with nasal irrigation. Now, a new study reveals another potential risk: the amoeba acanthamoeba, which could similarly threaten individuals using neti pots with unboiled tap water.
The study focused on 10 patients who contracted rare infections caused by acanthamoeba, with three of them succumbing to the illness. Analysis of these cases showed a common thread: all patients had engaged in nasal rinsing before falling ill, and many of them had used tap water. These findings were published in Emerging Infectious Diseases.
The implications of this study are clear: the use of tap water in nasal rinsing can lead to severe health consequences, including death, due to the presence of amoebas like acanthamoeba. Therefore, it is crucial for individuals practicing nasal irrigation to use boiled or distilled water to minimize the risk of infection.
“Invasive acanthamoeba infections are rare,” lead study author Julia Haston, MD, said. She is a lieutenant commander for the U.S. Public Health Service and medical epidemiologist in the Waterborne Disease Prevention Branch of the Centers for Disease Control and Prevention (CDC).
“Less than 15 people are diagnosed with these infections each year in the United States,” Dr. Haston added. “However, they can be very serious and are often fatal.”
Acanthamoeba Infections Connected to Unboiled Tap Water Used for Nasal Rinsing
Acanthamoeba infections are often mysterious because these organisms thrive in various water sources, creating multiple pathways for exposure, explains Haston. The precise mode of transmission can be unclear; it might occur through direct contact with contaminated water, such as while swimming or using inadequately treated water for nasal rinsing. Additionally, the amoeba could enter the body through cuts in the skin or by inhalation.
A recent study sheds light on the potential risk of nasal rinsing in contracting these infections, marking a significant finding in this area. This highlights the importance of considering nasal rinsing practices as a possible source of infection.
Anthony Del Signore, MD, PharmD, an assistant professor and director of endoscopic sinus and skull base surgery at Mount Sinai Beth Israel in New York City, notes that all individuals in the study had weakened immune systems, which likely increased their vulnerability to acanthamoeba infections. This underscores the crucial role of immune health in preventing such infections.
“The risk would be rather low for such an infection to be seen in an immunocompetent individual,” Dr. Del Signore, who wasn’t part of the new study, stated. “Would it be possible? Sure, but rather low.”
Despite the infection risk, there are many health reasons for nasal rinsing as long as you take the proper precautions, Del Signore says.
The Need to Boil Tap Water Used for Nasal Rinsing
A survey released in February 2023, which was nationally representative, indicated that nearly two-thirds of Americans mistakenly believe it’s safe to use unboiled tap water for nasal rinsing.
“I tend to have our patients boil tap water or use distilled bottled water,” Del Signore said. “If they use tap water, boiling helps to boil off any chemicals or impurities and also helps with sterilizing water to remove any bacteria.”
Health Benefits that Come with Nasal Rinsing
According to Del Signore, nasal rinsing offers benefits for both acute and chronic conditions such as sinusitis, seasonal allergies, the common cold, and upper respiratory infections. Its mechanism involves thinning nasal mucus, improving nasal lining health, and removing bacteria, viral particles, allergens, and pollutants.
This practice is commonly referred to as saline rinsing because people typically mix a saline solution with sterilized water, which aids in reducing inflammation in the nasal passages.
The two main methods for nasal rinsing involve using a neti pot or a squeeze bottle to introduce the water and saline solution into the nasal passages. Del Signore also mentions that doctors often recommend nasal rinsing as an adjunct to medications required to combat infections and inflammation.
“The most effective way to use nasal irrigation is to use it once or twice daily when symptomatic, and also when not symptomatic as a preventive measure if one is prone to such illness,” David Rabago, MD, a professor of family medicine at Penn State University College of Medicine in Hershey, Pennsylvania, said. He also wasn’t part of the new study.
“Nasal irrigation can reasonably be added to one’s routine hygiene, like brushing teeth or washing hands,” Dr. Rabago also said. “Depending on the condition and severity, nasal irrigation can be a stand-alone therapy, or used alongside more conventional therapy, such as antibiotics or nasal steroid spray.”
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