types of immunisation

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Acquired immunity may take two forms: active or passive.

Actively acquired immunity involves the development of an immune response normally due to natural exposure to an infective organism or following vaccination. This immunity leads to long-lasting resistance to infection.

Passively acquired immunity however does not involve a host immune response and it occurs naturally in infants following the placental transfusion of maternal immunoglobulin or artificially, following immunoglobulin transfusion. Passively acquired immunity to infection is relatively short lived.

Last reviewed 01/2018