When a parasite is growing and multiplying within or on host’s body, the host is said to have an infection. The nature of an infection can vary widely with respect to its severity, location and number of organisms involved.

Usually, the chances of getting a disease increases with the increase in the number of organisms (parasites) present within a given body at the time of infection. However, few organisms can cause disease if they are virulent or if the host’s resistance is low.


Also Read: 11 Things Parents should know about taking Antibiotics.

Related Keyword: Allergic ReactionsAdaptive ImmunityInnate Immunity

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