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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

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Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

TB skin test. TB skin test.
The Venusian Surface The Venusian Surface
The primate dental formula illustrated for (a) the lower dentition of an Old World monkey and (b) th The primate dental formula illustrated for (a) the lower dentition of an Old World monkey and (b) th
Systems and Organs of the Human Body Systems and Organs of the Human Body
Layers and Major Structures of the Skin Layers and Major Structures of the Skin
Body plan of an aquatic snail and micrograph of a radula. Body plan of an aquatic snail and micrograph of a radula.
Video: Definition of heart rate

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