BIOLOGY CH22 World of Microbes — Science STD 9 — Question
Tamilnadu BoardEnglish MediumSTD 9ScienceBIOLOGY CH22 World of Microbes1 Mark
Question
What causes illness?
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Answer
An illness is casual due to a specific infectious agent, capable of being directly or indirectly transmit infection from person to person, animal to animal or from the environment (air, water & food) and insects.
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