Table 2.

Global prevalence and morphological characteristics of intestinal helminths (Lindquist and Cross, 2017, Parija et al., 2017).

Intestinal helminths	Global prevalence	Disease and morphology
Ascaris lumbricoides	1.2 billion	- Disease in humans: Ascariasis - Adult male: 15–31 cm by 2–4 mm. - Adult female: 20–35 cm by 3–6 mm, produce 240 000 eggs/day.
Trichuris trichiura	795 million	- Disease in humans: Trichuriasis - Adult male: 30–45 mm by 0.1–0.5 mm. - Adult female: 35–55 mm by 0.1–0.5 mm, produce 3000–10000 eggs/day.
Strongyloides stercoralis	600 million	- Disease in humans: Strongyloidiasis - Adult males (free-living cycle only): 0.9 mm by 40–50 µm. - Adult females (free-living and parasitic cycles): 2.0–2.5 mm by 40–50 µm, produce 30–40 partially embryonated eggs/ day.
Necator americanus and Ancylostoma duodenale	740 million	- Disease in humans: Necatoriasis and Ancylostomiasis - Adult male: 6–11 mm by 0.4–0.6 mm. - Adult female: 10–13 mm by 0.4–0.6 mm, produce 10 000–20 000 (A. duodenale) and 5000–10 000 (N. americanus) eggs/day.
Enterobius vermicularis	200 million	- Disease in humans: Enterobiasis - Adult male: 2.5 mm by 0.1–0.2 mm. - Adult female: 8–13 mm long by 0.3–0.5 mm, produce 16 000 eggs/day.