Birds are thought to be the main animal reservoirs of influenza viruses.

It is feasible because there are no animal reservoirs besides humans and pigs.

Historically, plague has emerged repeatedly from animal reservoirs in Asia to devastate humanity.

Humans are the natural hosts of the virus; no animal reservoirs are known to exist.

But little is known about the cause of human outbreaks or the animal reservoirs where the virus must live between them.

Conclusively stating that Blastocystis has an animal reservoir depends upon unraveling the true nature of its transmission.

Trypanosoma cruzi life cycle starts in an animal reservoir.

Since final hosts of O. volvulus are restricted to primates, it has no major animal reservoir.

There are no animal reservoirs for P. malariae.

Sheep, goats and cattle are considered the predominant animal reservoirs.