infectivity

infectivity

The doctor explained the infectivity of the common cold.

Definition

Noun: Infectivity is the quality or state of being able to cause infection; the capacity of a pathogen (such as a virus, bacterium, or parasite) to establish an infection in a host organism. It specifically refers to the ease with which an infectious agent can spread to and infect new hosts.

Usage Examples
  • (The virus spreads easily from person to person.)
  • (They assessed how readily the strain could cause infection in the animals.)
  • (Vaccination decreases the pathogen's ability to spread.)
Advanced Usage
  • "Infectivity rate": a measure or statistic quantifying how often an infectious agent causes infection in exposed individuals.
    • The infectivity rate of COVID-19 was estimated to be higher than that of seasonal influenza. (The proportion of exposed people who became infected was greater.)
  • "Infectivity period": the time during which an infected individual can transmit the pathogen to others.
    • Patients with chickenpox are most contagious during the infectivity period before the rash appears. (They can spread the virus even before symptoms are visible.)
Variants and Related Words
  • Infectious (adj): capable of causing infection; likely to spread.
    • The patient is highly infectious and must be isolated. (The person can easily transmit the disease.)
  • Infect (verb): to cause a person, animal, or plant to become diseased by introducing a pathogen.
    • The bacteria can infect open wounds if not cleaned properly. (They can enter and cause disease.)
  • Infection (noun): the process or state of being infected with a pathogen.
    • The infection spread quickly through the school. (The disease affected many people.)
  • Infectiveness (noun): a synonym for , though less commonly used.
    • The infectiveness of the virus was studied in the lab. (Its ability to cause infection was analyzed.)
Synonyms
  • Transmissibility: the ability of a disease to be passed from one host to another.
  • Communicability: the capacity of a disease to be transmitted between individuals.
  • Contagiousness: the quality of being easily spread by direct or indirect contact.
Related Idioms (contextual only, as no direct idioms exist for this technical term)
  • "To catch like wildfire": to spread very quickly, often used to describe highly infectious diseases.
    • The rumor caught like wildfire, just like a disease with high infectivity. (It spread rapidly through the community.)