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An infectious disease or communicable disease is caused by a biological agent such as by a virus, bacterium or parasite. The vector does not have to be biological.Many infectious diseases are transmitted by droplets which enter the airway (e.g. common cold and tuberculosis).nfectious disease requires an agent and a mode of transmission (or vector). A good example is malaria, which is caused by Plasmodial parasites, chiefly Plasmodium falciparum but does not affect humans unless the vector, the Anopheles mosquito, is around to introduce the parasite into the human bloodstream.
Need a list of common diseases? The most common illnesses are listed here by name, including information about their symptoms. They include the most common communicable diseases and and common infectious diseases.Most common bacterial diseases and common viral diseases can be gotten over quickly or treated medically by a doctor.Since these are so common, there's definitely treatments for these common ailments. For more information about genetic diseases you can see this genetic disorders list.For valuable information on central nervous system disorders see the central nervous system disorders page.eed a list of common diseases? The most common illnesses are listed here by name, including information about their symptoms. They include the most common communicable diseases and and common infectious diseases.