This practical manual and reference book for Veterinary and Medical students, teachers and researchers deals with diagnosis of infectious diseases. Agglutination, Precipitation,Immunoelectrophoresis, Haemagglutination, Complement Fixation, ELISA, Western Blotting, Lymphocyte Assays, Immunofluorescence, Flow Cytometry, Nucleic Acid isolation, PCR, RT-PCR, Real time PCR, gene cloning and sequencing, Avian Influenza, Rabies, Brucellosis, Plague, Anthrax, Leptospirosis, Burkholderia, Orientia and Parasitic infections, Differentiation of Infected and Vaccinated Animals in FMD and Bacteriophages are covered. Authors include Dr HV Batra, a consultant to WHO & FAO who has developed many diagnostic kits, Prof R Sharma, who heads a Reference Laboratory on FMD and has developed a DIVA kit, Dr M Rawat, who has cloned the lysin gene of a bacteriophage, Prof H M Saxena, an Immunologist, who has introduced novel modifications to enhance the sensitivity of Agglutination Test, Prof C K Singh, trained at Institut Pasteur, Paris and an expert in Rabies diagnosis, Prof Ramneek, a Virologist trained at New Zealand and Dr Debjani, a Cytometry specialist.