I examine single-cell parasites called Leishmania (pronounced “leash-mane-ee-aa”). These are much smaller than human cells and have little tails, and are spread from sandfly to humans.
You can see pictures of them here to get an idea:
– parasites in liver tissue
And here as small wine-purple ovals around the bigger human cells
These were taken using high-powered microscopes so you can see how much smaller they are.
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