Posted by Rosa on Tuesday, February 2, 2010 at 8:05pm.
I disagree.
Check this site for the right answer.
http://docs.google.com/viewer?a=v&q=cache:wKOQtTQhpOIJ:www.eacfaculty.org/morales/ECE105%2520Chapter_6_notes.pdf+incubation+stage+illness+contagious&hl=en&gl=us&pid=bl&srcid=ADGEESieRhK_Ev5Uek4jUQXJaZ3IgPLf6W4gF5-sw9ctD4pyQ2sRuZl_Kk8tK4kjsjv_Sy0c5i-lfY4cNDh1PiINdO-sE8CxB4dv1mYr5apElKQNJaZW87XAiHBHV1i-IjEBytj4C-HW&sig=AHIEtbSHAzvK_qQEF6VO9DnarWEFIA4fZw
my answer is C
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