Buzz
In a recent incident, a young boy in Texas passed away due to an infection caused by what the media has labeled a 'brain-eating amoeba.' While many sensationalized names for obscure organisms exist (recall the murder hornets?), this term precisely defines the organism involved. It is indeed an amoeba, and in rare instances, it consumes human brain tissue.
What is the true cause of this infection?
Naegleria fowleri is a microscopic amoeba, a single-celled organism larger than viruses or bacteria but still invisible to the naked eye. N. fowleri thrives in warm water, making it common in hot springs or lakes during summer in warmer regions. While it typically feeds on microscopic organisms like bacteria, it can also consume human brain tissue under certain conditions.
How does it enter your brain?
Ingesting N. fowleri isn’t a concern—our stomach acids would break it down. It doesn’t spread through surfaces or respiratory droplets either. Instead, the amoeba must enter through the nose via contaminated water.
This rarity stems from the uncommon scenario of warm water entering the nasal cavity. Most N. fowleri infections are linked to activities like swimming or playing in warm water. If you use a neti pot for nasal irrigation, adhere to the CDC’s guidelines by boiling, filtering, or using distilled water to ensure it’s free of amoebas.
How does it cause death?
Once the amoeba travels up the nose, it targets the nerves connecting the pharynx to the brain, feeding on the olfactory bulbs responsible for the sense of smell. Early symptoms often include a loss of smell and taste.
After reaching the olfactory bulbs, it advances to other parts of the brain, where it can become fatal.
When your immune system detects the brain being consumed, it dispatches immune cells and intensifies the inflammatory response. Not only is your brain under attack by the amoeba, but your immune system also contributes to the damage. (While inflammation is the immune system’s attempt to assist, it can cause additional harm.) This leads to a condition known as primary amoebic encephalitis, or PAM.
Although most documented cases of PAM have resulted in death, certain experimental treatments have shown promising outcomes.
Am I at risk of being next?
The silver lining regarding N. fowleri infections is their extreme rarity. Since the 1960s, only 145 cases have been reported in the US. Some years see no cases at all, while others record just a handful.
Since it thrives in warm water, infections are more prevalent in warmer regions of the US, such as Texas and Florida. The northern half of the country has reported no cases whatsoever.
In daily life, there’s no specific action required to avoid it. When someone becomes infected from a swimming area or splash pad, thousands of others who swam there typically remain unaffected. The reasons for susceptibility remain unclear, and as per the CDC, there’s no dependable method to test water for safety.
The most practical step is to remind yourself of its rarity and ensure you’re adhering to safety protocols if you’re deliberately introducing water into your nasal passages.
