Definition: Unimmunised, also known as unvaccinated, refers to individuals who have not received a vaccine or are immune to a virus. This includes people of all ages and in all countries, including those who have recovered from vaccines or who are currently vaccinated. Unimmunized individuals may be more susceptible to diseases due to their lack of immunity, but they can still be protected by vaccination if the disease is not prevalent or there is no known vaccine available for it.
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