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What Is the Size of Salmonella Bacteria?

Salmonella is a group of bacteria most widely known for causing food-borne illness (salmonellosis) and typhoid fever in developing countries. The Centers for Disease Control and Prevention (CDC) estimates it receives reports of 40,000 cases of salmonellosis each year, but predicts more than 1 million cases likely occur.

  1. Cell Morphology

    • Salmonella bacteria are Gram-negative, rod-shaped bacteria approximately 2 micrometers in length and 0.5 micrometers in diameter.

    Laboratory Identification

    • Scientists identify Salmonella through cultures and a series of tests in a laboratory.

    Salmonellosis

    • Salmonellosis is a gastrointestinal illness from ingestion of Salmonella bacteria found in the feces of young poultry and reptiles. The most common method of transmission is through contaminated food or water. The CDC estimates that contact with reptiles causes 70,000 cases of salmonellosis each year, and evidence suggests amphibians may also be carriers.

    Typhoid Fever

    • Salmonella typhi causes typhoid fever, which is still common in developing areas of the world. Overseas travelers should be immunized and ensure proper handling and preparation of water and food.

    Recent Outbreaks

    • Between 2006 and 2008, Salmonella outbreaks occurred in contaminated spinach, peanut butter, jalapeno peppers and dry dog food. Between February 1 and April 15, 2009, a single strain of Salmonella infected 234 persons across 14 states, with alfalfa sprouts suspected by the CDC as the source.

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