disorders of human health that result from infection caused by living pathogens (viruses, bacteria, rickettsia, fungi, helminths, ticks, other pathogenic parasites); transmitted from infected persons to healthy ones, and tend to mass spread See also: contagious diseases; infections;
Any disease caused by the entrance, growth, and multiplication of bacteria or protozoans in the body; a germ disease. Examples are Lyme Disease, Meningitis, and many others. An infectious disease 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.
the diagnosis and treatment of communicable diseases, including hepatitis, meningitis, tuberculosis, Lyme Disease and AIDS