The writers noticed while studying Eimeria miyairii Ohira infections in the white rat that there was a rather wide variation in the size of the oöcysts when a highly heterozygous strain of the parasite was used for infective purposes.
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Hall, Phoebe R. and Becker, Elery R.
"The Size of the Oocyst in a Selected Strain of Coccidia,"
Proceedings of the Iowa Academy of Science, 40(1), 235-236.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/136