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Effect of experimental hookworm infection on insulin resistance in people at risk of Type 2 Diabetes: a randomized, placebo-controlled trial

Pierce, D.; McDonald, M.; Merone, L.; Becker, L.; Thompson, F.; Lewis, C.; Field, M.; Rahman, T.; Croese, J.; Loukas, A.; McDermott, R.; Giacomin, P.

2023-03-20 endocrinology
10.1101/2023.03.16.23287372 medRxiv
Show abstract

The reduced prevalence of insulin resistance and type 2 diabetes (T2D) in countries with endemic parasitic worm infections suggests a protective role for worms against metabolic disorders, however clinical evidence has been non-existent. This 2-year randomized controlled trial of hookworm infection in 40 people at risk of T2D involved treatment with either 20 or 40 Necator americanus third-stage larvae (L3) or Placebo. Primary outcome was safety, with homeostatic model assessment of insulin resistance (HOMA-IR), fasting blood glucose (FBG), and body mass being the key metabolic outcomes. Adverse events were more frequent in hookworm-treated participants, where 44% experienced transient gastrointestinal symptoms. FBG and HOMA-IR were significantly lowered in both hookworm-treated groups at 1-year, and body mass was significantly lowered after L3-20 treatment at 2-years. Overall, hookworm infection was well tolerated in people at risk of T2D, and were associated with improved insulin resistance, warranting further exploration of the benefits of hookworms on metabolic health.

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