Infectious diseases (medical specialty)

Infectious diseases is a medical specialty focused on diagnosing, treating, and preventing illnesses caused by bacteria, viruses, fungi, parasites, and other infectious agents.

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Antimicrobial stewardship: Coordinated efforts to use antimicrobial medicines appropriately and improve patient outcomes. Specialists guide antibiotic choices, duration, and review to preserve effectiveness and reduce harm.
Clinical microbiology: The laboratory discipline that detects and characterizes microorganisms causing human disease. Culture, molecular tests, and susceptibility results inform diagnosis and treatment.
Infectious disease: An illness caused by the invasion or activity of an infectious agent in a host. This broader clinical problem is the specialty’s central subject.
Medical microbiology: The study of microorganisms relevant to human health, including their diagnosis and laboratory characterization. It supplies laboratory expertise, while infectious diseases focuses on patient care and clinical decisions.
Healthcare-associated infection: An infection acquired during or as a result of receiving healthcare. Specialists help identify preventable infections and improve hospital control practices.
Sepsis: Life-threatening organ dysfunction caused by a dysregulated response to infection. Infectious disease physicians help identify the source and tailor treatment for severe infection.
Antimicrobial susceptibility testing: Laboratory methods that determine whether microorganisms are inhibited by antimicrobial drugs. Results help select therapy when resistance or treatment failure is a concern.
Pathogen: A biological agent capable of causing disease in a host. Bacteria, viruses, fungi, and parasites each require distinct diagnostic and treatment approaches.
Clinical immunology: The medical specialty concerned with disorders of the immune system and their diagnosis and treatment. It centers on immune dysfunction, whereas infectious diseases centers on illnesses caused by infectious agents.
Antimicrobial resistance surveillance: The systematic collection and analysis of data on antimicrobial-resistant organisms. Clinical and laboratory findings contribute to tracking resistance and guiding policy.