Which reaction is described as fever due to endotoxin-like products released by death of microorganisms during antibiotic treatment?

Which reaction is described as fever due to endotoxin-like products released by death of microorganisms during antibiotic treatment?

• A. Reye's syndrome
• B. Jarisch-Herxheimer Reaction
• C. Stevens-Johnson Syndrome
• D. Nitritoid Reaction

Answer: (B)

The main idea here is a reaction that happens when antibiotics cause a rapid breakdown of certain bacteria, releasing endotoxin-like materials that trigger a strong inflammatory response. When bacteria are killed, especially spirochetes such as those causing syphilis or relapsing fever, their components spill into the body and activate the immune system. This leads to fever, chills, and sometimes rapid heart rate or low blood pressure within hours of starting treatment. The body’s cytokines, like TNF-alpha and IL-6, mediate these symptoms, not an allergic or direct toxic effect from the drug itself. This is not about a drug allergy or a severe skin reaction. It’s a transient inflammatory reaction tied to bacterial lysis from antibiotic therapy. In practice, it’s managed with supportive care—fever control and monitoring—while typically continuing the antibiotic, since stopping treatment can allow the infection to progress. It’s classically seen with infections treated with antibiotics that lyse spirochetes, though it can occur with other bacteria as well.

The main idea here is a reaction that happens when antibiotics cause a rapid breakdown of certain bacteria, releasing endotoxin-like materials that trigger a strong inflammatory response. When bacteria are killed, especially spirochetes such as those causing syphilis or relapsing fever, their components spill into the body and activate the immune system. This leads to fever, chills, and sometimes rapid heart rate or low blood pressure within hours of starting treatment. The body’s cytokines, like TNF-alpha and IL-6, mediate these symptoms, not an allergic or direct toxic effect from the drug itself.

This is not about a drug allergy or a severe skin reaction. It’s a transient inflammatory reaction tied to bacterial lysis from antibiotic therapy. In practice, it’s managed with supportive care—fever control and monitoring—while typically continuing the antibiotic, since stopping treatment can allow the infection to progress. It’s classically seen with infections treated with antibiotics that lyse spirochetes, though it can occur with other bacteria as well.