<prompt> Herd immunity provides protection to-Immunized personsNon immunized personsBothNone  <response>: Herd immunity describes a type of immunity that occurs when the vaccination of a poion of the population provides protection to unprotected individuals provides an immunological barrier to the spread of disease in human herd elements-a occurence of clinical and sub clinical infection in the herd b immunization of the herd c herd structure refer pgno:102 park 23 rd edition. 