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Escherichia coli

Escherichia coli - Gram-negative, facultatively anaerobic, rod prokaryote; with multiple flagella and fimbriae. Magnification 3,515, Scanning electron microscope. This bacterium can cause urinary tract infections, traveler's diarrhea and nosocomial infections. Courtesy of Dennis Kunkel.

Avian Influenza A (H5N1)

Ultrastructural details of an avian influenza A (H5N1) virion, magnification approximately 150,000x, transmission electron microscopy (TEM). This virus is a subtype of the influenza A virus which can cause disease in humans and many other animals. Human infections with avian influenza viruses are rare and most often occur after people are in prolonged and close contact with infected or dead birds. However, non-sustained person-to-person spread of avian influenza viruses is thought to have occurred in the past. Image courtesy of the Centers for Disease Control and Prevention (CDC / Cynthia Goldsmith; Jackie Katz).

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