Chagas Disease Affects Up to 100,000 Californians

Up to 100,000 residents in California may be unknowingly infected with a serious disease known as Chagas disease. This illness, which can be potentially fatal, is caused by a parasite found in “kissing bugs.” Reports indicate that this disease is also present in 29 other states across the country.

Chagas disease remains inactive for years but can eventually reveal itself through severe cardiac problems, such as heart attacks or strokes. In California alone, between 70,000 and 100,000 people might be afflicted without their knowledge.

There are around twelve species of kissing bugs found in the U.S., with four of those residing in California. Areas in Los Angeles, like Griffith Park, are known hotspots with a large population of these bugs. Interestingly, about a third of the kissing bugs in that famous park are infected with the Chagas disease parasite. The parasite has also been detected in various local wildlife, including wood rats, skunks, and mice.

According to Norman Beatty, an expert on Chagas disease, the illness has largely been overlooked and has impacted many Latin American communities for decades. Yet, it’s also making its presence felt in the United States.

With its growing prevalence, some experts are urging organizations like the World Health Organization and the Centers for Disease Control and Prevention to consider Chagas disease as endemic in the U.S.

California stands out with the highest number of infected residents, partly due to its large population from areas where the disease is more common. A study conducted by California’s Department of Health revealed that many cases from 2013 to 2023 were acquired outside the U.S. However, local transmission couldn’t be entirely dismissed in the remaining cases.

Chagas disease, once mainly found in rural regions of Mexico and Central and South America, is now reported in at least 30 U.S. states. Studies suggest that around 8 million people worldwide, with about 280,000 in the U.S., are living with this disease without even realizing it.

In California, doctors are not required to report Chagas cases as they must for other diseases like influenza, which likely leads to significant underreporting. Entomologist Gabriel Hamer suggested that the confirmed cases are merely “the tip of the iceberg,” and the actual numbers remain unknown.

“The lack of a standardized reporting system and active surveillance means many go undiagnosed,” Hamer added.

Interestingly, many individuals discover they have Chagas disease only when attempting to donate blood. The disease can trigger acute reactions, including swollen limbs and eyes, and in some severe cases, anaphylaxis. Longer-term complications can be far more troubling, leading to seizures or strokes.

Initial symptoms may be mild and can include fever, fatigue, body aches, headaches, rash, loss of appetite, diarrhea, vomiting, and eyelid swelling, often appearing within weeks or months after infection, according to the CDC.

While Chagas disease can be treated effectively if caught early, it may still result in serious and sometimes fatal cardiac issues.