Citing the Ichthyophthirius multifiliis genome:

Ref: 22004680: Coyne, R. S., Hannick, L., Shanmugam, D., Hostetler, J. B., Brami, D., Joardar, V. S., Johnson, J., Radune, D., Singh, I., Badger, J. H., Kumar, U., Saier, M., Wang, Y., Cai, H., Gu, J., Mather, M. W., Vaidya, A. B., Wilkes, D. E., Rajagopalan, V., Asai, D. J., … Clark, T. G. (2011). Comparative genomics of the pathogenic ciliate Ichthyophthirius multifiliis, its free-living relatives and a host species provide insights into adoption of a parasitic lifestyle and prospects for disease control. Genome biology, 12(10), R100.