British Woman Diagnosed with Brain Parasites After Trip to India
A British woman, Lowri Denman, has been diagnosed with a rare parasitic infection that led to 38 cysts forming in her brain. The 42-year-old believes she contracted the infection during a two-month trip to India in 2007. Denman suffers from neurocysticercosis, a disease caused by the pork tapeworm, Taenia solium, which can affect the brain and is a significant cause of epilepsy in many parts of the world.
The alarming signs first appeared for Denman in 2011, four years after her journey. After discovering a long tapeworm in her stool, an MRI scan confirmed her diagnosis. Since then, she has undergone extensive treatment and must take medication for epilepsy caused by the infection.
However, experts question whether her trip to India was the definitive source of her infection. The World Health Organization (WHO) states that neurocysticercosis can occur when a person swallows tiny eggs from the Taenia solium found in contaminated food or water, typically due to poor hygiene.
While undercooked pork can lead to tapeworm infections, it doesn’t directly cause neurocysticercosis. Denman mentioned she took precautions and avoided animal products while in India. Nonetheless, Dr. Brendan Healy, an infectious disease specialist, believes she may have unknowingly consumed contaminated food.
Fact One: Various Sources of Tapeworm Infection
Denman’s doctor indicated that she likely contracted the infection from ingesting pork containing microscopic tapeworm eggs. Though often associated with pork, tapeworms can arise from other foods too. For example, undercooked beef can carry a different type of tapeworm, while raw fish can harbor others.
The WHO clarifies that neurocysticercosis specifically occurs when eggs are ingested through contaminated food or water, not just from eating infected meats. The eggs can taint fruits and vegetables, especially if handled by someone who has poor hand hygiene.
Fact Two: Contaminated Water as a Risk Factor
In addition to tainted food, contaminated water is a significant way tapeworms spread. Neurocysticercosis can develop if a person consumes water that has been contaminated with the tapeworm’s eggs. This is more likely in areas with inadequate sanitation and sewage systems.
Importantly, while intestinal tapeworm infections are linked to undercooked pork, neurocysticercosis occurs when eggs are swallowed. Swimming in contaminated waters can also pose a risk, but infections are unlikely in properly treated swimming pools.
Fact Three: Rare in the UK, More Common in India
Neurocysticercosis is rare in the UK due to stringent food safety measures and modern sanitation. A study found that only 26 cases were reported between 2001 and 2015, with most cases linked to individuals who had traveled to areas where the disease is more common.
In contrast, India remains a hotspot for neurocysticercosis. The WHO notes that it is prevalent in regions with poor sanitation, making it easier for the disease to spread. Research indicates that neurocysticercosis has been identified in a significant percentage of epilepsy cases in India.
Question: Can We Be Sure of the Source of Denman’s Infection?
It’s challenging to definitively attribute Denman’s infection to her time in India. No test can pinpoint the exact moment or location of infection. Doctors rely on her travel history and the prevalence of the disease in various regions to make educated assessments.
Considering her stay in India and the rarity of the disease in the UK, it is probable that her infection originated there. However, the long gap between her exposure and diagnosis is not unusual, as the parasite can lie dormant for years before causing noticeable symptoms.
In conclusion, while Dr. Healy suggests that India is the most likely source, it is important to remember that there could be other potential avenues for infection. The nature of neurocysticercosis emphasizes the importance of hygiene and food safety to prevent such cases in the future.
