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| − | [[Image:Host_agent_environment_triade.svg|thumb|200px|Disease can occur when the causes in the environment, host and agent are present]]
| + | '''Disease can occur when the causes in the environment, host and agent are present''' |
Revisi terkini pada 25 Agustus 2014 12.04
Disease can occur when the causes in the environment, host and agent are present
