Which statement best describes a reason for the high morbidity of listeriosis?

Which statement best describes a reason for the high morbidity of listeriosis?

• A. It is highly contagious between animals
• B. It has high morbidity and mortality because its endotoxin thrives in any aged animal and the organism can survive a wide range of temperatures/pH levels
• C. It is rapidly killed by pasteurization
• D. It only affects newborns

Answer: (B)

The main idea here is that the high disease burden from listeriosis stems from the organism’s resilience and ability to cause invasive infection. Listeria monocytogenes can tolerate a wide range of temperatures and pH levels, which allows it to survive and persist in many foods and processing environments. This environmental robustness increases the chance that people will consume contaminated foods, especially ready-to-eat products, leading to infection. Once inside the host, Listeria behaves as an intracellular pathogen that can spread from cell to cell and reach the bloodstream, CNS, or placenta. In vulnerable populations—pregnant women, newborns, the elderly, and the immunocompromised—this can progress to severe illness, including meningitis, septicemia, and fetal loss, contributing to high morbidity and mortality. The idea in this statement is the environmental persistence and broad growth range as the key factor behind the disease’s impact. Note that endotoxin concerns don’t fit Listeria biology (it’s a Gram-positive organism, so endotoxin isn’t the primary virulence driver), and the disease is not limited to newborns or strictly about contagious spread between animals. Pasteurization reduces risk, though contamination can occur post-processing.

The main idea here is that the high disease burden from listeriosis stems from the organism’s resilience and ability to cause invasive infection. Listeria monocytogenes can tolerate a wide range of temperatures and pH levels, which allows it to survive and persist in many foods and processing environments. This environmental robustness increases the chance that people will consume contaminated foods, especially ready-to-eat products, leading to infection.

Once inside the host, Listeria behaves as an intracellular pathogen that can spread from cell to cell and reach the bloodstream, CNS, or placenta. In vulnerable populations—pregnant women, newborns, the elderly, and the immunocompromised—this can progress to severe illness, including meningitis, septicemia, and fetal loss, contributing to high morbidity and mortality.

The idea in this statement is the environmental persistence and broad growth range as the key factor behind the disease’s impact. Note that endotoxin concerns don’t fit Listeria biology (it’s a Gram-positive organism, so endotoxin isn’t the primary virulence driver), and the disease is not limited to newborns or strictly about contagious spread between animals. Pasteurization reduces risk, though contamination can occur post-processing.