A coliform bacterium that likely contaminates dairy products is
a. Bartonella
b. Serratia
c. Enterobacter
d. Proteus

Verified step by step guidance

1. Identify the characteristics of coliform bacteria, which are typically Gram-negative, rod-shaped, non-spore forming, and capable of fermenting lactose with the production of acid and gas at 35-37°C.
2. Understand that coliforms are commonly used as indicator organisms for sanitary quality of foods and water, as they are often found in the environment and feces of warm-blooded animals.
3. Review the list of bacteria provided: Bartonella, Serratia, Enterobacter, and Proteus, and determine which of these are classified as coliforms.
4. Recognize that Enterobacter is a genus of coliform bacteria, often associated with contamination in dairy products due to its ability to ferment lactose.
5. Conclude that Enterobacter is the most likely candidate for a coliform bacterium that contaminates dairy products.

Key Concepts

Coliform Bacteria

Coliform bacteria are a group of bacteria commonly found in the environment, including in feces of warm-blooded animals. They are used as indicators of microbial contamination in food and water. The presence of coliforms, particularly in dairy products, suggests potential contamination and the possible presence of pathogens.

Dairy Product Contamination

Dairy products can be contaminated by various microorganisms, including bacteria, during production, processing, or storage. Contamination can lead to foodborne illnesses and spoilage. Understanding the types of bacteria that can contaminate dairy is crucial for ensuring food safety and public health.

Enterobacter

Enterobacter is a genus of bacteria that includes several species known to be opportunistic pathogens. Some Enterobacter species are commonly found in the intestines of humans and animals, and they can contaminate food products, including dairy. Identifying Enterobacter in dairy products is important for assessing food safety and preventing outbreaks.