What does infective mean?
Infective means capable of causing infection or spreading an infectious agent. It is used especially in medicine, biology, and public-health contexts to describe people, organisms, materials, or developmental stages that can transmit a pathogen. For example, someone may be infective without showing symptoms, while a parasite may have an infective stage that is capable of entering a host. The word often appears in established expressions such as “infective agent” and in the medical condition “infective endocarditis.” In ordinary conversation, infectious is usually more familiar, but infective can be preferable when the focus is specifically on the capacity to produce infection rather than simply being associated with infection. Its technical character gives it a formal tone, but the basic idea is straightforward: an infective is a potential source of infection.
adjectiveCapable of causing infection or of transmitting an infectious agent. In parasitology, the term may specifically describe a stage capable of infecting a host.
- Capable of causing infection or transmitting a pathogen.
- Of or relating to a stage of an organism or parasite capable of infecting a host.
"The doctor explained that an asymptomatic patient could remain infective even after symptoms had disappeared."
"The doctor stressed that an asymptomatic patient can remain infective even after symptoms disappear."
"The parasite enters its host in the infective stage."
A person can be infective before symptoms appear, which is why invisible transmission can be so consequential.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does infective come from?
Infective was formed in English from infect together with the adjective-forming suffix -ive. It belongs to a wider family based on Latin inficere, meaning “to taint” or “infect,” and related English words include infection, infectious, and infectivity. The modern adjective developed within English as medical and scientific usage increasingly distinguished the capacity to cause infection from other forms of disease or contamination.
Related word forms
How infective is actually used
Infective is more common in medical, biological, and other technical contexts than in everyday speech, where infectious is generally preferred. It can describe an agent, material, or developmental stage capable of producing infection.
Easily confused with infective
Infectious is the more usual general term for something capable of spreading an infection, while infective is especially common in technical and medical contexts.
Infective describes something capable of causing infection, whereas infected describes a person, organism, or object that has acquired an infection.