Quoting myself because I was wrong!
The first stage of decomp (autolysis) is not influenced by bacteria or microorganisms.
http://www.enotes.com/forensic-science/decomposition
"Autolysis consists of the fast and intense spontaneous self-destruction of tissues by the body enzymes present in the cells, without any bacterial interference. "
and it further says:
"Once cells stop receiving nutrients and oxygen via blood circulation, they start anaerobic (without oxygen) "breathing", breaking ATP (adenosine tri-phosphate) into ADP (adenosine di-phosphate) to obtain energy. Anaerobic respiration lasts for a few hours, until all ATP reserves are exhausted. "
The bacterial breakdown of those cells which results in the fluid being released is putrefaction, the second stage.