the Risks of Nasal Irrigation and Amoebic Infections - Influenza

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Amoeba protozoa


I used to catch colds frequently, and due to my work, I live in a colder area in the northern part of Taiwan, where I work in crowded places and cannot wear a mask all the time, making it hard to avoid infections.
Each time I caught a cold, it was quite severe, with muscle and joint pain, and I even had difficulty standing up to walk to the bathroom.
Three years ago, I heard somewhere that colds are mostly transmitted through the nasal mucosa, so I came up with a plan: every 1 to 2 hours, I would scoop tap water in my palm and inhale it through my nose several times to achieve a cleansing effect.
Indeed, over the past three years, I have only had one severe cold and a couple of mild colds that resolved the next day.
However, I recently heard about two cases in the U.S.
where individuals used a neti pot with tap water to rinse their noses and ended up contracting amoebic meningoencephalitis, resulting in death.
I believe there shouldn't be amoebas in tap water, right? I also swim in pools; could I get infected there? Since I use my palm to scoop tap water for nasal rinsing, the depth should be shallower than using a neti pot; would that pose a risk of infection? Thank you for your response!

KK, 40~49 year old female. Ask Date: 2012/10/08

Dr. Ke Zhengqin reply Influenza


It is not recommended to rinse your nose with water using your nostrils.
To prevent more severe colds, it is advisable to receive an annual influenza vaccine.
When someone exhibits symptoms of a cold, such as coughing, they must wear a mask to prevent cross-infection.
Generally, tap water does not contain amoebae unless it is contaminated.
If you play in rivers or streams or swim in pools contaminated with amoebae, accidental aspiration of water may lead to inhalation of amoebae, which can result in severe cases of amoebic brain infection.
Additionally, if the solution used to clean contact lenses is contaminated with amoebae, it can cause damage to the eyes from the amoebae.

Reply Date: 2012/10/08

More Info


Nasal irrigation, while beneficial for clearing nasal passages and alleviating symptoms of congestion, can pose significant risks if not performed correctly. Your experience with frequent colds and the subsequent self-initiated nasal irrigation using tap water raises important concerns regarding safety and potential infections, particularly amoebic infections.

Firstly, it’s crucial to understand that the primary risk associated with nasal irrigation stems from the use of non-sterile water. Tap water, while generally safe for drinking, is not sterile and can contain various microorganisms, including bacteria and amoebae. The most notorious of these is *Naegleria fowleri*, an amoeba that can cause a rare but severe brain infection known as primary amoebic meningoencephalitis (PAM). This organism is typically found in warm freshwater environments, such as lakes and hot springs, but can also be present in improperly treated tap water.

In the cases you mentioned, where individuals contracted amoebic infections after using nasal irrigation devices with tap water, it highlights the importance of using sterile solutions. The Centers for Disease Control and Prevention (CDC) recommends using distilled, sterile, or previously boiled water for nasal irrigation to minimize the risk of infections. If you are using tap water, it should be boiled for at least one minute and then cooled before use. This practice ensures that any harmful organisms are killed before the water is introduced into your nasal passages.

Regarding your swimming pool activities, while swimming pools are typically treated with chlorine to kill pathogens, there is still a risk of exposure to amoebae if the water is not properly maintained. If you accidentally inhale water while swimming, there is a potential risk, albeit low, of introducing harmful organisms into your nasal passages. However, the risk of contracting an amoebic infection from swimming pools is significantly lower than from using tap water for nasal irrigation.

Your method of using your hand to scoop water for nasal irrigation may indeed reduce the depth of water entering your nasal passages compared to a nasal irrigation device, but it does not eliminate the risk of infection. The act of introducing any non-sterile water into your nasal cavity carries a risk, especially if the water is contaminated.

To prevent future infections and maintain nasal health, consider the following recommendations:
1. Use Sterile Water: Always use distilled, sterile, or boiled water for nasal irrigation. This is the most effective way to prevent infections.

2. Consider Saline Solutions: Pre-packaged saline nasal sprays or irrigation solutions are available and can be a safer alternative to homemade solutions.

3. Practice Good Hygiene: Ensure that any devices used for nasal irrigation are cleaned and sterilized after each use to prevent bacterial growth.

4. Consult a Healthcare Professional: If you frequently suffer from severe colds or sinus issues, it may be beneficial to consult an ENT specialist. They can provide tailored advice and treatment options that may reduce your susceptibility to infections.

5. Vaccination: To reduce the frequency of colds, consider getting vaccinated against influenza annually, as this can help prevent severe respiratory infections.

In summary, while nasal irrigation can be beneficial for managing nasal congestion, it is essential to prioritize safety by using sterile water and maintaining good hygiene practices. By doing so, you can significantly reduce the risk of infections, including those caused by amoebae.

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