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An infectious disease is one caused by a biological agent such as a virus, bacterium, or fungi, that can be passed from one organism to another.
An infectious disease is one caused by a biological agent such as a virus, bacterium, or fungi, that can be passed from one organism to another. Transmission can happen directly, or indirectly via another carrier, as in the case of malaria, which is carried by mosquitoes.
Transmission can happen directly, or indirectly via another carrier, as in the case of malaria, which is carried by mosquitoes.