Tularemia Explained 🔥 | Rabbit Fever, Tick Bites, Ulcers & Pneumonia | Omar Reda

Tularemia, or rabbit fever, is a zoonotic infection caused by Francisella tularensis that can present with ulcers, lymphadenopathy, conjunctivitis, pharyngitis, pneumonia, or severe systemic illness. Tularemia, also called “rabbit fever,” is not one single clinical picture. A patient may present with: • a painful skin ulcer and regional lymph nodes • lymphadenopathy without an ulcer • unilateral conjunctivitis • severe pharyngotonsillitis • pneumonia after aerosol exposure • or severe systemic illness without any obvious local lesion All may be caused by the same organism: Francisella tularensis. In this lecture from Omar Reda’s Infectious Diseases & Tropical Medicine series, we explain tularemia using one simple clinical framework: EXPOSURE → PORTAL OF ENTRY → SYNDROME → POSSIBLE DISSEMINATION The most important question is: HOW DID THE ORGANISM ENTER THE PATIENT? This lecture covers: • Francisella tularensis microbiology • Why tularemia has a very low infectious dose • Intracellular survival within macrophages • Type A vs Type B tularemia • Rabbit, hare, tick and deer-fly exposure • Contaminated water and food • Mowing, farming and aerosol exposure • Laboratory exposure • Why routine person-to-person transmission is not recognized • Ulceroglandular tularemia • Glandular tularemia • Oculoglandular tularemia • Oropharyngeal tularemia • Pneumonic tularemia • Typhoidal tularemia • The “no ulcer” diagnostic trap • Tularemia vs plague • Tularemia vs cutaneous anthrax • Pneumonic tularemia vs TB and fungal disease • Selecting the correct diagnostic specimen • Ulcer material and lymph-node aspirate • Respiratory specimens, blood and CSF when indicated • Why the laboratory must be alerted before culture processing • PCR and molecular diagnosis • Tularemia serology • Why early negative serology does NOT exclude tularemia • Why IgM alone does not prove acute infection • Why persistent antibodies are not a test of cure • Paired serology and fourfold antibody change • Histopathology and granulomatous inflammation • Modern treatment principles • Ciprofloxacin, levofloxacin, gentamicin and doxycycline • Severe tularemia and aminoglycoside-based treatment • Why delayed treatment changes antimicrobial choice • Why ordinary beta-lactams may fail • Suppurative lymph nodes and source control • Neuroinvasive tularemia • Pregnancy and pediatric considerations • Occupational exposure and post-exposure prophylaxis 🧠 HIGH-YIELD MEMORY MAP Skin + node → Ulceroglandular Node only → Glandular Eye + node → Oculoglandular Throat + cervical nodes → Oropharyngeal Lung → Pneumonic Systemic illness without localization → Typhoidal ⚠️ IMPORTANT EXAM TRAPS • An ulcer is NOT required for tularemia. • Early negative serology does NOT exclude the diagnosis. • IgM does not automatically mean acute disease. • Persistent antibodies do not prove persistent infection. • Pneumonic tularemia does not require routine droplet isolation like pneumonic plague. • Failure of routine beta-lactam therapy may be an important diagnostic clue. • Alert microbiology BEFORE processing suspected cultures. The central message: Do not memorize tularemia as six unrelated diseases. Understand the portal of entry, and the clinical syndrome begins to make sense. 👨‍⚕️ Lecturer: Dr. Omar Reda Abdelmaksoud 📚 Series: Omar Reda’s Infectious Diseases & Tropical Medicine A Clinical and Syndromic Approach 🌐 Official Website: https://omarredaacademic.com/ 📘 Explore the complete book: https://omarredaacademic.com/omar-red... #Tularemia #RabbitFever #FrancisellaTularensis #TickBite #ZoonoticDiseases #InfectiousDiseases #TropicalMedicine #Microbiology #MRCP #USMLE #OmarReda 🔔 Subscribe for more high-yield infectious diseases and tropical medicine lectures.