Blood smears from my office lab reported as part of a series.
This image from one of my patients shows indeterminate findings. Parasitic organisms are seen within a red blood cell. Bartonella is frequently seen at the edge of red blood cells but is also found inside cells. These organisms are too large for typical Bartonella -- although there is a lot of variability in the size of differing species. These organisms cannot be identified as Babesia since they lack clear diagnostic characteristics. For now I have to classify these findings under "mystery bugs."