General guidelines for rabies diagnosis:
http://www.cdc.gov/rabies/diagnosis/index.html
CDC protocol:
www.cdc.gov/rabies/pdf/rabiesdfaspv2.pdf
OIE protocol:
OIE Manual of Diagnostic Tests and Vaccines
for Terrestrial Animals 2014
www.oie.int/fileadmin/Home/eng/Health_standards/tahm/2.01.13_RABIES.pdf