Sellar's staining technique is used for diagnosis of . . . . . . . .

Sellar's staining technique is used for diagnosis of Rabies.
The Seller's staining is an old method used for diagnosis of rabies by detection of negribodies. According to WHO, the direct fluorescent antibody technique (dFAT) is a gold standard for rabies diagnosis because of its short duration, low cost and higher sensitivity.
Staining with Mann's, giemsa, or Sellers stains can permit differentiation of rabies inclusions from other intracellular inclusions. With these stains, Negri bodies appear magenta and have small (0.2 µm to 0.5 µm), dark-blue interior basophilic granules.