Chlamydia pneumoniae is a common species of bacteria of the Chlamydia genus. Approximately 50 percent of Americans aged 20 and older have experienced a Chlamydia pneumoniae infection, and reinfection later in life seems common, notes the Centers for Disease Control and Prevention.
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A brain aneurysm is a bulge or dilation in an artery in the brain. Aneurysms occur in areas where the walls of the artery are thin or weak. Aneurysms develop in approximately one in 20 people, according to the Merck Manual.
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Babies can develop enlarged kidneys -- a condition known as hydronephrosis -- while still in the womb, or after birth. This condition is the most frequently discovered problem revealed by ultrasound examinations of babies in the womb.
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The brown widow spider, or Latrodectus geometricus, is one of five widow spider species found in the United States. More than 30,000 species of spiders exist, but only a few can inflict a serious bite and produce venom harmful to humans, according to Dr. James H.
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