Which virulence factor is commonly associated with Shigella?

Which virulence factor is commonly associated with Shigella?

• A. Production of lactic acid
• B. Able to invade epithelial cells and produce Shiga toxin
• C. Forming biofilms
• D. Resistant to all antibiotics

Answer: (B)

Shigella is well-known for its ability to invade epithelial cells, which is a key aspect of its pathogenicity. This invasion allows the bacteria to disrupt the intestinal barrier, leading to inflammation and severe diarrhea. In addition to cell invasion, Shigella produces Shiga toxin, which is a potent cytotoxin that can cause damage to the intestinal lining and can lead to complications such as hemolytic uremic syndrome in severe cases. The combination of cell invasion and toxin production makes Shigella exceptionally virulent and is a hallmark of its pathogenic mechanism. The other options do not accurately represent Shigella's key virulence factors. While some bacteria can form biofilms or have antibiotic resistance, these traits are not specific or defining features of Shigella's pathogenesis. Similarly, the production of lactic acid is not a characteristic associated with Shigella. Thus, the ability to invade epithelial cells and produce Shiga toxin is the defining virulence factor for this pathogen.

Shigella is well-known for its ability to invade epithelial cells, which is a key aspect of its pathogenicity. This invasion allows the bacteria to disrupt the intestinal barrier, leading to inflammation and severe diarrhea. In addition to cell invasion, Shigella produces Shiga toxin, which is a potent cytotoxin that can cause damage to the intestinal lining and can lead to complications such as hemolytic uremic syndrome in severe cases. The combination of cell invasion and toxin production makes Shigella exceptionally virulent and is a hallmark of its pathogenic mechanism.

The other options do not accurately represent Shigella's key virulence factors. While some bacteria can form biofilms or have antibiotic resistance, these traits are not specific or defining features of Shigella's pathogenesis. Similarly, the production of lactic acid is not a characteristic associated with Shigella. Thus, the ability to invade epithelial cells and produce Shiga toxin is the defining virulence factor for this pathogen.