Comprehensive Respiratory and Infectious Disease Nursing Practice Test 2026 - Free Nursing Practice Questions and Study Guide

Fever tends to drop first when pneumonia responds to antibiotics. If the bacteria are susceptible, the infection’s impact on the body’s temperature-regulating system eases, and defervescence often occurs within about 24 to 48 hours. This early cooling reflects the dropping bacterial load and waning inflammatory response. Breathing improvement and chest discomfort may follow later, as lung inflammation resolves and gas exchange improves, so they aren’t as reliable an early sign. If fever doesn’t decrease within 48 to 72 hours, it prompts reassessment for factors like antibiotic resistance, incorrect diagnosis, or complications.