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Protozoan parasites infect and kill millions of people worldwide every year, particularly in developing countries where access to clean fresh water is limited. Among the most common are intestinal parasites, including  Giardia lamblia  and  Entamoeba histolytica . These parasites wreak havoc on the epithelium lining the small intestines ( G .  lamblia ) and colon ( E .  histolytica ) causing giardiasis and amebiasis, respectively. In addition, there are less common but far more deadly pathogens such as  Naegleria fowleri  that thrive in warm waters and infect the central nervous systems of their victims via the nasal passages. Despite their prevalence and associated high mortality rates, there remains an unmet need to identify more effective therapeutics for people infected with these opportunistic parasites. To address this unmet need, we have surveyed plants and traditional herbal medicines known throughout the world to identify novel antiparasitic agents with activity against  G .  lamblia ,  E .  histolytica , and  N .  fowleri . Herein, we report  Larrea tridentata , known as creosote bush, as a novel source for secondary metabolites that display antiparasitic activity against all three pathogens. This report also characterizes the lignan compound classes, nordihydroguairetic acid and demethoxyisoguaiacin, as novel antiparasitic lead agents to further develop more effective drug therapy options for millions of people worldwide.

Larrea tridentata: A novel source for anti-parasitic agents active against Entamoeba histolytica, Giardia lamblia and Naegleria fowleri