ABER   =    Number of slides examined    x 100

                                               Population

 

                                =    9000        x 100

                                    140000

            

                                = 6.4 %

 

API   =   Confirmed cases during one year   x 1000

                Population under surveillance

                 

          =       50      x 1000

                 140000

 

         =   0.36 per 1000 population