This is a human blood smear sample from Africa. The diagnostic feature of this sample is that in the blood smear, there are visible parasites. Although this sample was not stained well, by naked eyes we can identify flagella on the parasite body. There are more than 20 parasites on this blood smear sample.
This sample is from patient of African trypanosomiasis or known as African sleeping sickness. It is caused by T. b. gambiense and T. b. rhodesiense, which are indistinguishable morphologically. A typical trypomastigote has a small kinetoplast located at the posterior end, a centrally located nucleus, an undulating membrane. Here is a zoom in image from Wikipedia.
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.