बांद्रार बेराम नुजानाय समाव , सानैसो सुबुंखौ सोंथि खालामनो हागौ एबा दबथायनाय बिजिरनायजों नायसंनोबो हागौ ।
In large outbreaks a sample of population may be interviewed or the investigations may be by case control studies .