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| Causative Agents for Diseases & |
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| InjuriesCommunicable Disease |
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| Model |
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| Biological |
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| Agents |
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| Chemical |
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| Agents |
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| Physical |
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| Agents |
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| Viruses |
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| Rickettsiae |
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| Bacteria |
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| Fungi |
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| Protozoa |
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| Metazoa |
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| Pesticides |
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| Food
additives |
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| Pharmacologics |
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| Industrial
chemicals |
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| Air
pollutants |
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| Cigarette
smoke |
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| Heat |
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| Light |
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| Radiation |
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| Noise |
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| Vibration |
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| Speeding |
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| objects |
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