GRAM STAIN...

Original Gram Stain Protocol

Primary Stain : Ehrlich's aniline Gentian violet

followed by : Aqueous solution of Iodine-Potassium Iodide

Decolouriser: Absolute alcohol

Counter stain : Bismarck brown


Modifications 

Hucker's modification

Burke's modification

Kopeloff- Beerman modification

MNEMONICS

Meningitis common organisms 

NHS

Neisseria meningitidis
Hemophilus influenzae
Streptococcus pneumoniae

Members of Picorna viridiae

PEECoRNA

Poliovirus
Echovirus
Enterovirus
COrona virus
Rhinovirus
Hepatitis A