infectious disease

from the GNU version of the Collaborative International Dictionary of English.

• Any disease caused by the entrance, growth, and multiplication of microorganisms in the body; a germ disease. It may not be contagious.
• Sometimes, as distinguished from contagious disease, such a disease communicated by germs carried in the air or water, and thus spread without contact with the patient, as measles.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a disease transmitted only by a specific kind of contact