Several species, most of which are opportunistic, also infect humans.

The species in this genus infect the gasterointestinal wall of vertebrates.

This species infects the gasterointestinal tract of birds and reptiles.

A single species may infect multiple prey or predator animals.

Other species infect cattle, livestock, and occasionally domestic animals.

However, whether these species infect amphibians or cause limb malformations has not been explored.

Five species of Plasmodium can infect and be transmitted by humans.

A related species, G. pulchrum, infects a variety of mammals but rarely humans.

This species can infect a wide variety of hosts in many plant families.

Geophilic species are usually recovered from the soil but occasionally infect humans and animals.