will you still cough up yellow mucus after pnuemonia (possibly
atypical pneumonia as I never had fever) - finshed antibiotics (Ketek)
after 5 days - things
looked great - yellow mucus slowed, almost stopped. But after long
night of sleep - see streaks of yellow again today. Have not seen
yellow in 4 days. But it's back a little. BTW, I still feel good and
no fever.

Please visit your physician soon. There is no way that we can diagnose
your problem over the Internet. Anyone who has had pneumonia and who
has a recurrence of symptoms needs medical attention.