The Collaborative International Dictionary of English v.0.48:

malta fever \malta fever\ n. (Med.)
   An infectious disease contracted from meat or milk products
   from infected domestic animals; called also brucellosis and
   undulant fever.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

undulant fever
    n 1: infectious bacterial disease of human beings transmitted by
         contact with infected animals or infected meat or milk
         products; characterized by fever and headache [syn:
         brucellosis, undulant fever, Malta fever, Gibraltar
         fever, Rock fever, Mediterranean fever]