Open letter to NASA :
I recommend this should be the focus of the high level PR over the next few weeks. If we fail to find signs of life then that WOULD also be serious news.
So far Rosetta has detected vast quantities of water, methane and alcohol.
Instruments on Philae (eg MIDAS instrument) can detect proteins, viruses and bacteria sized nanoparticles. If none are detected, then this would be a serious setback to intersolarsystem Panspermia. Some are predicting fossilized diatoms in the surface pebbles; as well as dormat or even active Viruses and Bacteria under the surface.
Conversely finding such particles would be as significant as the Russian discovery of life growing on the outside windows of the ISS – samples returned to earth last week.
Which discovery will be published first to confirm that life is likely to be a cosmic phenomenon?