Which type of organism can protozoa cause diseases in?

Protozoa are a diverse group of single-celled eukaryotic organisms known for their complex life cycles and various modes of movement, including flagella, cilia, and pseudopodia. While protozoa can infect and cause diseases in a range of hosts, including animals, humans, and even insects, they are particularly notable for their impact on animal health. For instance, protozoan parasites can cause significant diseases in animals such as cattle, sheep, and fish, leading to severe economic losses in agriculture and aquaculture.

Their capability to infect animals includes well-known examples like Plasmodium species, responsible for malaria in humans but also affecting animal hosts, and Toxoplasma gondii, which can infect a variety of mammals. The emphasis on animals highlights the role of protozoa in veterinary pathology as well as potential zoonotic transmission to humans.

In comparison, while protozoa may also have some impact on humans and insects, the statement that protozoa specifically cause diseases in animals encompasses a broader and more significant range of pathogens and diseases prevalent in veterinary and wildlife contexts.