- Bacterial infectious diseases are a broad category of disease conditions caused by pathogenic bacteria proliferating in the human body or causing tissue damage.
- Causative agents include various bacteria such as Streptococcus, Staphylococcus, and E. coli, and infections can be transmitted through droplets, contact, wounds, contaminated food or water, sexual contact, and insect or animal bites.
- Bacteria can damage cells and tissues by proliferating rapidly, producing toxins, or infiltrating tissues.
- Clinical manifestations vary depending on the site of infection and the causative agent, ranging from localized tissue damage to systemic infection symptoms.
- Risks and prognosis may vary per individual depending on age, immune status, underlying conditions, exposure to infection, vaccination status, and access to healthcare.
- Symptoms and natural history vary depending on the causative agent and the site of infection; while some infections may improve with the immune response alone, others may worsen or cause complications.
- Diagnosis is made by estimating the site of infection based on symptoms and physical examination, and by combining culture tests, molecular tests, blood tests, and imaging studies when necessary.
- Test results must be interpreted by considering the time of collection, specimen quality, previous antibiotic use, and the distinction between colonization and actual infection.
- Management focuses on assessing the site and severity of infection, and when necessary, providing appropriate antimicrobial therapy along with supportive care for hydration, pain, respiration, and other conditions, while monitoring for complications.
- Antibiotics are the primary treatment for necessary bacterial infections, but they are not automatically required for all infections and must be used in accordance with guidelines.