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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Comparison of small subunit rRNA gene sequences of vertebrate, invertebrate chordate, and invertebra Comparison of small subunit rRNA gene sequences of vertebrate, invertebrate chordate, and invertebra
Approximately 1 pound (0.45 kg) of ground elk meat formed into patties; note the relatively small fa Approximately 1 pound (0.45 kg) of ground elk meat formed into patties; note the relatively small fa
IgE bound to a mast cell and cross-linked by antigen-causing mast cell degranulation. IgE bound to a mast cell and cross-linked by antigen-causing mast cell degranulation.
Active transport: Absorption Methods in the Small Intestine Active transport: Absorption Methods in the Small Intestine
Section of a normal brain (left) and an HD brain (right). The HD brain shows extensive damage to the Section of a normal brain (left) and an HD brain (right). The HD brain shows extensive damage to the
Muscle action in the small intestine Muscle action in the small intestine
Video: Brain Anatomy Animation (Part 2 of 2)

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