Implement Control and Prevention Measures - as soon as possible!!
- As soon as source is known - people are sick or hurting and need help; must know agent and source of agent + susceptibility of host + chain of transmission
- Aim at chain of agent-source-host - break the chain of transmission at any of its 3 points
- May interrupt transmission or exposure - with vehicles as isolation
- May reduce susceptibility - with immunization, legal issues and / or education