Protozoa:

Species

Resistance to chlorine

Health significance

Relative infectivity

Acanthamoeba

A. culbertsoni

High

High

High

Cryptosporidium

C. hominis/parvum

High

High

High

Cyclospora

C. cayetanensis

High

High

High

Entamoeba

E. histolytica

High

High

High

Giardia

G. intestinalis

High

High

High

Naegleria

N. fowleri

Low

High

Moderate

Helminthes:

Dracunculus

D. medinensis

Moderate

High

High