<prompt> All organisms show bipolar staining except -Calymatobacter granulomatisYersinia pestisH. influenzaeBurkholderia pseudomallei  <response>: Safety pin like appearance Bipolar staining both ends densely stained and a clear central area is seen in - Y. pestis H. ducreyi Calymatobacter granulomatis Vibrio parahemolyticus Burkhodelderia pseudomallei Burkhodelderia mallei Gram, Wright, Wayson or methylene blue staining or Giemsa stain is used for demonstration of the typical bipolar safety pin morphology. 