Biology
Answer
Infection — The transmission of diseases from one person to another is called infection.
Pathogen — A pathogen is a disease-causing micro-organism.
Incubation period — Incubation period is the period between the entry of germs and appearance of the first symptoms of the disease. All infectious diseases have a certain incubation period.
Allergen — An antigenic substance capable of producing immediate hypersensitivity allergy is called an allergen.
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