Photo Credit Florida DOH
Although extraordinarily rare, the most common way for people to become infected with the Naegleria parasite is while swimming in warm, usually stagnant fresh water lakes and ponds. After introduction of this Free Living Amoeba (FLA) into the nasal passages, it makes a direct bee line to the brain, where is causes PAM (Primary Amebic Meningoencephalitis).
This brain infection has nearly always been fatal, but in 2013 we saw survivors of PAM in the United States – two children – who had received an investigational drug called miltefosine.
But long-time readers will also recall that in 2013 we saw a 4 year-old unusually infected through contact with a municipal water supply while visiting Louisiana. Subsequently we saw the St. Bernard Parish Water Supply Tests Positive For Naegleria Fowleri, which prompted an increase in chlorination.
In 2011, we saw two cases of Naegleria reported in Neti pot users from Louisiana as well, prompting the Louisiana Health Department to recommend that people `use distilled, sterile or previously boiled water to make up the irrigation solution’ (see Neti Pots & Naegleria Fowleri).
Photo Credit FDA
Since I did a major blog on this topic less than a month ago (see Naegleria: Rare, 99% Fatal & Preventable), I won’t rehash all those details now, except for reminding my readers of an excellent resource; http://amoeba-season.com/, a USF Philip T. Gompf Memorial Fund project, which was set up by a pair of Florida doctors who tragically lost their 10 year-old son to this parasite in 2009.
Late yesterday, the Louisiana Department of Health and Hospitals (DHH) confirmed the presence of the Naegleria fowleri ameba once again in the St. Bernard Parish Water System, and issued the following warning.
DHH Confirms Naegleria Fowleri Ameba in St. Bernard Parish Water System
Drinking water is safe to consume, but State urges public to take precautions
Wednesday, July 22, 2015 | Contact: Media & Communications: Phone: 225.342.1532, E-mail: firstname.lastname@example.org
Baton Rouge, La.—Late Wednesday, the Louisiana Department of Health and Hospitals (DHH) confirmed the presence of the Naegleria fowleri ameba in the St. Bernard Parish Water System at the site of a leaking sampling station. The water system, which serves 44,000 residents in St. Bernard Parish, was tested by DHH as part of the State's new public drinking water surveillance program. DHH notified the water system and local officials Wednesday evening. The Department asked the water system to conduct a 60-day chlorine burn to ensure that any remaining ameba in the system are eliminated. Parish President Dave Peralta confirmed that the system would conduct the burn out of an abundance of caution.
Based on current monthly chloramine residual compliance reports, the water system has met the requirements with Louisiana rules for chloramine disinfectant levels set forth by the 2013 by emergency rule and additional requirements in 2014 by the Louisiana Legislature. Five other sites on the system tested negative for the ameba and one site did not meet the required level of disinfectant.
Tap water in St. Bernard Parish is safe for residents to drink, but the Department urges residents to avoid getting water in their noses. Naegleria fowleri is an ameba that occurs naturally in freshwater.
As Naegleria fowleri infections are extremely rare, testing for this ameba in public drinking water is still relatively new and evolving. Fewer than 10 deaths in the United States have been traced back to the ameba, with three occurring in Louisiana over the last several years. The ameba was identified in St. Bernard Parish Water System in the summer of 2013; the U.S. Centers for Disease Control and Prevention (CDC) confirmed that the system no longer tested positive for the presence of the ameba in February 2014.
DHH conducts sampling of public drinking water systems for Naegleria fowleri each summer when temperatures rise. So far, DHH has tested 12 other systems for the ameba and still awaiting lab results for each.
Naegleria fowleri causes a disease called primary amebic meningoencephalitis (PAM), which is a brain infection that leads to the destruction of brain tissue. In its early stages, symptoms of PAM may be similar to bacterial meningitis.
DHH Safe Drinking Water Program staff sampled seven sites along the St. Bernard Parish Water System. Two of the seven sites tested positive for the ameba. One positive test was at a site at the water treatment plant before the water was treated. The second positive test occurred at 948 Angela Street, which may have been contaminated by ground water due to a leak at the sampling station. Chlorine levels at the site of the positive sample did meet the 0.5 mg/l requirement. The Department will continue to consult with the water system and the CDC. T
he Department requested that the water system conduct a 60-day free chlorine burn in the water system. The chlorine burn will help reduce biofilm, or organic buildup, throughout the water system and will kill the ameba. The parish has agreed to conduct this precautionary measure.
Precautionary Measures for Families
According to the CDC, every resident can take simple steps to help reduce their risk of Naegleria fowleri infection. Individuals should focus on limiting the amount of water going up their nose. Preventative measures recommended by the CDC include the following:
- DO NOT allow water to go up your nose or sniff water into your nose when bathing, showering, washing your face, or swimming in small hard plastic/blow-up pools.
- DO NOT jump into or put your head under bathing water (bathtubs, small hard plastic/blow-up pools); walk or lower yourself in.
- DO NOT allow children to play unsupervised with hoses or sprinklers, as they may accidentally squirt water up their nose. Avoid slip-n-slides or other activities where it is difficult to prevent water going up the nose.
- DO run bath and shower taps and hoses for five minutes before use to flush out the pipes. This is most important the first time you use the tap after the water utility raises the disinfectant level.
- DO keep small hard plastic/blow-up pools clean by emptying, scrubbing and allowing them to dry after each use.
- DO use only boiled and cooled, distilled or sterile water for making sinus rinse solutions for neti pots or performing ritual ablutions.
- DO keep your swimming pool adequately disinfected before and during use. Adequate disinfection means:
- Pools: free chlorine at 1 to 3 parts per million (ppm) and pH 7.2 to 7.8, and
- Hot tubs/spas: free chlorine 2 to 4 parts per million (ppm) or free bromine 4 to 6 ppm and pH 7.2 to 7.8.
- If you need to top off the water in your swimming pool with tap water, place the hose directly into the skimmer box and ensure that the filter is running. Do not top off the pool by placing the hose in the body of the pool.
Residents should continue these precautions until testing no longer confirms the presence of the ameba in the water system. Residents will be made aware when that occurs. For further information on preventative measures, please visit the CDC website here: http://www.cdc.gov/parasites/naegleria/prevention.html.
The Louisiana Department of Health and Hospitals strives to protect and promote health statewide and to ensure access to medical, preventive and rehabilitative services for all state citizens. To learn more about DHH, visit www.dhh.louisiana.gov. For up-to-date health information, news and emergency updates, follow DHH's Twitter account and Facebook.
I would note that the statement `Fewer than 10 deaths in the United States have been traced back to the ameba, with three occurring in Louisiana over the last several years’ is incorrect. Between 1962 and 2014 there were 133 cases of Naegleria Fowleri infection reported in the United States, with all but 3 of them fatal.