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• a  relating to or caused by rickettsias

• Aureomycin has been successful against many rickettsial and virus-like diseases: Q-fever, rickettsial pox, parrot fever, typhus fever, lympho-granuloma venereum (a venereal .
• What excites researchers most: in animal tests it has proved a potent cure for certain rickettsial diseases, caused by tiny, bacteria-like organisms that have resisted previous .
• The discovery was made not by a man who hunts ordinary bacteria, but by a microbiologist who specializes in leprosy and rickettsial diseases like typhus and spotted fever.