This is a good comparison of Cold, Flu, & H1N1 symptoms.

From http://www.village.sussex.wi.us/documents/DIFFERENCESBETWEEN.pdf
The Supreme Court has indeed said that prosecutors are immune from suit for anything they do at trial. But in this case, Harrington and McGhee maintain that before anyone being charged, prosecutors gathered evidence alongside police, interviewed witnesses and knew the testimony they were assembling was false.
The prosecutors counter that there is "no freestanding constitutional right not to be framed."