Definition

Noun: An infectious disease is a disorder of structure or function in a human, animal, or plant that is caused by a pathogenic agent (such as a bacterium, virus, fungus, or parasite). The defining characteristic is that the disease is capable of being transmitted from one host to another, either directly or indirectly.

Usage

The term is used to classify and describe illnesses based on their transmissible nature, distinguishing them from non-communicable diseases like heart disease or cancer. - It is a countable noun (e.g., an infectious disease, infectious diseases). - It is commonly used in medical, public health, and general contexts.

Examples

Advanced Usage

• Epidemiology: In this field, the term is fundamental. The study of the distribution and determinants of infectious diseases in populations is a core focus.
• Public Health Policy: Phrases like "infectious disease control," "infectious disease surveillance," and "infectious disease outbreak" are standard in policy and planning documents.

Variants and Related Words

• Infection (n): The process of infecting or the state of being infected. An infectious disease is the clinical manifestation of an infection.
• Communicable Disease (n): Often used synonymously with infectious disease, though sometimes "communicable" emphasizes the ease of transmission.
• Contagious Disease (n): A subset of infectious diseases that are easily spread from person to person through direct or close contact (e.g., the common cold).

Synonyms

• Communicable disease
• Transmissible disease
• Contagious disease (for those easily spread)

Antonyms

• Non-communicable disease (e.g., diabetes, arthritis)
• Genetic disorder (e.g., cystic fibrosis)
• Degenerative disease (e.g., Alzheimer's disease)

Related Phrases and Collocations

• Infectious disease specialist: A doctor who diagnoses and treats infectious diseases.
• Infectious disease agent/pathogen: The microorganism that causes the disease.
• Infectious disease epidemiology: The branch of epidemiology focusing on these diseases.
• Prevent the spread of infectious disease: A common public health goal.

Noun

1. a disease transmitted only by a specific kind of contact