MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Blood sampling. Ugandan child having a blood sample taken by the finger-prick method. The finger has just been pricked and the resulting drop of blood is being smeared onto a glass slide for microscopic examination. The blood film can be stained with special dyes to make the blood cells show up more clearly. Blood films can be used to detect blood disorders such as sickle cell anaemia, and infections such as malaria, where parasites can be seen inside the red blood cells. This child's blood is being tested for malaria, which is an endemic problem in Uganda. Photographed at St. Mary's Hospital in Lacor, Gulu, Uganda.
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