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Salmonella typhimurium

Salmonella typhimurium - Gram-negative, enteric, rod prokaryote (dividing); note the flagella. This zoonotic microorganism causes salmonellosis (food poisoning) in humans when infected fowl, domestic mammals or turtles contaminate milk, eggs, meat, poultry or shellfish (which humans ingest). Magnification 3200. Courtesy of Dennis Kunkel.


Smallpox virus virion, magnification approximately 370,000x, transmission electron microscopy (TEM). The image shows the “dumbbell-shaped” structure inside the smallpox virion which is the viral core and contains the viral DNA. Smallpox infection is serious, contagious and in some cases a fatal. Raised bumps, fluid-filled blisters (pox) that appear on the face and body of an infected person are typical signs of infection. Image courtesy of the Centers for Disease Control and Prevention (CDC) / Dr. Fred Murphy; Sylvia Whitfield.

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This bacteria causes tularemia a disease of animals and humans. Infection signs and symptoms by this aerobic, gram-negative, rod-shaped, non-spore forming, non-motile coccobacillus vary depending on how the bacteria enter the body. Illness ranges from mild to life-threatening. All forms are accompanied by fever, which can be as high as 104 °F.

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