Talk:Compartmental models in epidemiology

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Why does the basic reproductive rate/number have a negative sign in front of it? R_0 is supposed to be positive. Lambda and delta are both positive constants.....

[edit] Add labels to diagram.

Adding labels to the red, green, and blue plots would help explain what that plot is showing. —The preceding unsigned comment was added by 74.118.13.168 (talk) 03:22, 1 May 2007 (UTC).