Question

Define the terms infection, pathogen, incubation period and allergen.

Answer 1

Infection: the invasion of a pathogenic microorganism.
Pathogen: The disease-causing microbes are called pathogens. Examples: virus, bacteria and fungi.
Incubation period: The time period between the entry of the pathogen and appearance of the first symptoms is called the Incubation period.
Allergen: A substance that causes an allergic reaction is called allergen.