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Infectious diseases are diseases can transmitted among people. In opposite, non-infectious diseases mean vice versa, examples include diabetes and hypertension. The causal organisms of infectious diseases are generally bacteria, viruses and parasites. These organisms can be transmitted by different means such as oral (food and fluid), parenteral (blood transfusion), sexual activity, airborne or droplets from sneeze or talking and vectors such as dengue via Aedes mosquito.

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