Index Lab Results

Common human parasites and typical incubation periods (approximate)

1. Enterobius vermicularis (pinworm) — incubation: 2–6 weeks
2. Ascaris lumbricoides (roundworm) — incubation: 4–8 weeks (larval migration symptoms can occur earlier, days–weeks)
3. Trichuris trichiura (whipworm) — incubation: 1–3 months
4. Hookworms (Ancylostoma duodenale, Necator americanus) — incubation: skin penetration to intestinal symptoms: 2–6 weeks; allergic/respiratory larval migration may occur days–weeks earlier
5. Strongyloides stercoralis — incubation: 1–2 weeks for initial infection; autoinfection can persist for years
6. Taenia saginata / Taenia solium (tapeworms) — intestinal infection: 2–12 weeks; cysticercosis (T. solium larval tissue infection) symptoms may appear months–years after exposure
7. Diphyllobothrium latum (fish tapeworm) — incubation: 2–6 weeks (can be longer)
8. Echinococcus granulosus / E. multilocularis (hydatid disease) — incubation: months–years (slow-growing cysts)
9. Giardia lamblia (Giardia intestinalis) — incubation: 1–3 weeks (commonly 7–10 days)
10. Entamoeba histolytica — incubation: 2–4 weeks (can be shorter or longer)

More common human parasites

11. Cryptosporidium spp. — incubation: 2–10 days (commonly ~7 days)
12. Plasmodium spp. (malaria) 
P. falciparum: 7–14 days (often 9–14)
P. vivax / P. ovale: 12–18 days typical; relapse from dormant liver hypnozoites can occur months–years later
P. malariae: 18–40 days (can be much longer)
13. Leishmania spp. — incubation: weeks–months (often 2–6 months)
14. Trypanosoma brucei (African sleeping sickness) — incubation: days–weeks to months (variable by subspecies)
15. Trypanosoma cruzi (Chagas disease) — incubation: 1–2 weeks (acute), chronic manifestations months–years later
16. Toxoplasma gondii — incubation: 1–3 weeks for acute symptoms; congenital or reactivation timing varies widely
17. Trichinella spiralis — incubation: 1–2 weeks for gastrointestinal symptoms; myalgia and systemic symptoms 2–8 weeks after ingestion

 Norby