<prompt> The drug of choice for chemoprophylaxis in contacts of a patient of pneumonic plague is :Penicillin.RifampicinErythromycin.Tetracycline.  <response>: Ans. is d i.e. Tetracycline Park writes- The drug of choice for chemoprophylaxis is Tetracycline. For adults the dose in 500 mg 6 hourly for 5 days. A cheaper alternative is sulfonamideRemember that -DOC for treatment of Plague is streptomycin. Tetracycline is an alternative drug.Also Remember-The DOC for chemoprophylaxis and treatment of the following diseases- :DiseaseDOC for ChemoprophylaxisDOC for TreatmentPlagueTetracyclineStreptomycinInfluenzaAmantadine or RimantadineAmantadine or RimantadineDiptheriaErythromycinPenicillin or ErythromycinMeningococcal meningitisRifampicin is the DOC unless the organism is known to be sensitive tosulfadiazinePenicillinCholeraTetracyclineDOC for adults except pregnant females is -DoxycyclineDOC for Children -Trimethoprim sulfamethoxazole DOC for Pregnancy -FurazolidoneBacterial ConjunctivitisErythromycin ointment 