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I found all the microblogs containing the special keywords that might
be related to the mystery epidemic outbreak:
(flu, fever, chill, sweat, ache, pain, fatigue, cough, breathing, nausea, vomit, diarrhea)
and then plotted them as a bar chart, by day.

The height of the bars represents the number of blogs containing the 
keywords (ie, frequency count).

Note that bars in the last 3 days "dwarf" all the previous days.
I'm assuming these are the days the symptoms of the illness kicked into high gear.

Scroll down to the 2nd bar chart - this is where I omit the 3 tall bars,
so that I can see the detail of all the other bars.  Note that on the last
day before the symptoms kicked-in, there were more blogs with the word
'breathing' - perhaps this was the "first symptom" of the illness to 
show up?

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