Your Friendly Neighborhood Hookworms

For most of human history, people went about their daily lives with a worm or two -or fifty- in their guts. Only in the past century, with pharmaceuticals and sanitation practices, have we made significant strides towards deworming the whole of humanity. And that’s typically been thought of as a good thing, because having too many worms in your body can–quite literally -suck the life out of you.

But is it possible to have too few worms? Science wonders if deworming ourselves has actually led to an increase in certain chronic diseases. On this episode, we dive into Necator americanus, a.k.a. the American Hookworm, and its mysterious relationship with each of us.

my notes

Revisiting two of the stories from one of my favourite episodes of theirs: Radiolab 20090907 - Parasites

summary (llm)

This Radiolab episode explores the complex relationship between humans and hookworms (Necator americanus). The discussion spans over a century, tracing how these parasites shifted from being viewed as a public health enemy to potential medical tools.

Historical Context (2:11-10:20)

• In the early 20th century, John D. Rockefeller sought to understand why the American South was economically stagnant.
• Commissioners discovered that hookworm infections were causing widespread anemia and lethargy among Southerners.
• The subsequent push for sanitation and the construction of outhouses significantly reduced hookworm prevalence, helping the region’s economy improve.

The Hygiene Hypothesis & DIY Treatment (11:45-25:30)

• The episode highlights the “hygiene hypothesis,” which suggests that by eradicating parasites, modern societies may have inadvertently increased the prevalence of autoimmune diseases.
• Reporter Pat Walters profiles Jasper Lawrence, a man who suffered from severe allergies and asthma. After reading about the potential health benefits of hookworms, he traveled to Africa to intentionally infect himself, claiming it completely cured his condition.
• Lawrence later attempted to monetize this by shipping hookworms to others, leading to regulatory issues.

Modern Clinical Research (27:30-44:00)

• Molly Webster provides an update on recent clinical trials led by researchers like Dr. Paul Giacomin.
• Studies have explored using hookworms to treat conditions like Type 2 diabetes, celiac disease, and other autoimmune disorders.
• The science shows that hookworms survive by secreting proteins that modulate the host’s immune system and promote wound healing.
• While participants in trials often report improvements in well-being, the difficulty of standardizing and producing a live-parasite treatment means it remains experimental rather than a mainstream medical therapy.

Auto-Immune Disease Focus

The video explains that autoimmune diseases occur when the body’s immune system begins attacking its own tissues rather than just foreign invaders (18:42-19:02). Scientists have identified approximately 80 different types of these conditions, including multiple sclerosis, Crohn’s disease, and Type 1 diabetes (19:01-19:06).

Researchers hypothesize that because hookworms have evolved alongside humans for millions of years, they have developed the ability to secrete specific proteins that dampen or “quiet” the immune system (19:42-20:05). This modulation acts as a regulatory check, preventing the immune system from becoming hyperactive and attacking the body, which potentially offers relief for patients suffering from autoimmune disorders (39:50-40:15).