This is a blood smear sample from owl/husk in the U.S. On the sample, it is obvious that there are enlargement and shape changes in the blood cells. This symptom is from infection of Leucocytozoon ziemanni, a parasite with owl as its intermediate host. To form the scale bar, we drew two lines with 1mm space on the paper slides and took a picture. Then drew a line on the picture and divide it by 10 to make a 100um scale bar.
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