Serratia

Definition

Serratia is a genus of Gram-negative, rod-shaped bacteria often found in soil, water, and the human intestine. Serratia marcescens is the most studied species due to its association with hospital-acquired infections.

5 Must Know Facts For Your Next Test

1. Serratia marcescens can produce a red pigment called prodigiosin at room temperature.
2. It is known for being an opportunistic pathogen, particularly infecting immunocompromised individuals.
3. Serratia species are capable of producing various enzymes like DNase, lipase, and gelatinase which contribute to their pathogenicity.
4. They exhibit resistance to multiple antibiotics, making infections difficult to treat.
5. Serratia marcescens can catabolize lipids and proteins as carbon sources.

Review Questions

• What type of pigment does Serratia marcescens produce and under what conditions?
• Why are Serratia species considered opportunistic pathogens?
• Name three enzymes produced by Serratia that contribute to its pathogenicity.

Related terms

Proteobacteria: A major phylum of Gram-negative bacteria that includes a wide variety of pathogens.

Opportunistic Pathogen: An organism that causes disease primarily in immunocompromised hosts.

Microbial Metabolism: The set of chemical reactions that occur within microorganisms to maintain life.