### Clue: Address hygiene problem in infectious disease (2,3)
### Answer: P.O. BOX 
 ### Explanation: B.O. ("hygiene problem", one that requires deodorants, at least) in POX (a general term for "infectious disease"s incl. small*, chicken*, cow*, and an informal term for syphilis).  Defn:  "Address" eg. for those who don't want to be reveal their true addresses.  Shouldn't the enumeration be (1,1,3)?