flowchart TD Source("Infectious
Source"):::sourceNode Environment["Environment /
Surfaces"]:::mildNode PersonSpread["Person-to-Person
Spread"]:::orangeNode ImmuneDefense["New Host's
Immune Defense"]:::goodNode CommunityImmunity("Community
Immunity"):::goodNode Source --> Environment Environment --> PersonSpread PersonSpread --> ImmuneDefense ImmuneDefense --> CommunityImmunity CommunityImmunity -->|Fewer active sources when
spread is interrupted| Source classDef startNode fill:#5b9bd5,stroke:#333,stroke-width:2px,color:#fff,font-size:16px classDef processNode fill:#7e57c2,stroke:#333,stroke-width:2px,color:#fff,font-size:16px classDef decisionNode fill:#ffd54f,stroke:#333,stroke-width:2px,color:#333,font-size:16px classDef emergNode fill:#e57373,stroke:#333,stroke-width:2px,color:#fff,font-size:16px classDef mildNode fill:#64b5f6,stroke:#333,stroke-width:2px,color:#fff,font-size:16px classDef goodNode fill:#66bb6a,stroke:#333,stroke-width:2px,color:#fff,font-size:16px classDef endNode fill:#b0bec5,stroke:#333,stroke-width:2px,color:#333,font-size:16px classDef sourceNode fill:#9e9e9e,stroke:#333,stroke-width:2px,color:#fff,font-size:16px classDef orangeNode fill:#ffb74d,stroke:#333,stroke-width:2px,color:#333,font-size:16px linkStyle default stroke:#999,stroke-width:2px,font-size:14px