Infectious diseases are disorders caused by pathogenic microorganisms—including bacteria, viruses, fungi, and parasites—that can spread directly or indirectly between individuals or through environmental exposure.
Common Infectious Diseases
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Viral Infections:
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Influenza (Flu)
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HIV/AIDS
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COVID-19
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Hepatitis B/C
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Bacterial Infections:
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Tuberculosis (TB)
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Pneumonia
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Lyme Disease
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MRSA
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Fungal Infections:
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Candidiasis
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Aspergillosis
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Parasitic Infections:
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Malaria
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Giardiasis
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Toxoplasmosis
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Diagnostic Approaches
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Laboratory Testing:
✓ PCR tests (viral/bacterial detection)
✓ Blood cultures
✓ Serology (antibody testing)
✓ Microscopy (e.g., for malaria) -
Imaging:
✓ Chest X-rays (pneumonia/TB)
✓ CT/MRI for abscesses -
Clinical Evaluation:
✓ Symptom assessment
✓ Travel/exposure history
Treatment Modalities
| Pathogen Type | Treatment Options |
|---|---|
| Bacterial | Antibiotics (e.g., penicillin, cephalosporins) |
| Viral | Antivirals (e.g., oseltamivir, remdesivir) |
| Fungal | Antifungals (e.g., fluconazole) |
| Parasitic | Antiparasitics (e.g., artemisinin) |
Emerging Therapies: Monoclonal antibodies, phage therapy
Prevention Strategies
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Vaccination:
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Annual flu shots
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HPV vaccine
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COVID-19 boosters
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Infection Control:
✓ Hand hygiene
✓ PPE (masks, gloves)
✓ Sterilization protocols -
Public Health Measures:
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Contact tracing
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Quarantine protocols
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Vector control (mosquito nets, insecticides)
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Global Health Impact
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Antimicrobial Resistance (AMR): A growing threat requiring stewardship programs
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Pandemic Preparedness: Lessons from COVID-19
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Neglected Tropical Diseases: Affecting 1+ billion people worldwide
Did You Know? 30% of antibiotics prescribed are unnecessary (CDC).
When to See an Infectious Disease Specialist
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Persistent fever of unknown origin
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Recurrent infections
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Complex cases (immunocompromised patients)
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Pre-/post-travel consultations
