Extrapolation of the discovery curve suggests that there is still a substantial pool of undiscovered human virus species, although an apparent slow-down in the rate of discovery of species from different families may indicate bounds to the potential range of diversity. The first of these to be discovered was yellow fever virus in 1901, and three to four new species are still being found every year. There are 219 virus species that are known to be able to infect humans.
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