Which microorganism caused this? - (Apr/12/2014 )

A woman who gave birth to a baby a week earlier was frantically brought to a hospital with septicemia and a very high fever? 

We had to do an elaborate set up of tests to find the unknown and I think it's either 
1) streptococcus pneumoniae 
2) streptococcus pyogens 

Other options are seem to be: 
-Streptococcus bovis 
-Enterococcus faecalis 
-Staphylococcus aureus 
-Staphylococcus epidermis 
-Staphylococcus saprophyticus 
-Micrococcus luteus 
-Micrococcus varians

E.coli, Staph. aureus, Streptococcus penumonia, MRSA, clostridium septicum, Morganella morganii are few commonly found in puerperium (Post- natal).

see here 

Agent of classic puerperal (childbed) fever is Streptococcus pyogenes.  This was the condition that Semmelweis famously mitigated by having obstetric folks rinse their hands in choride of lime (calcium hypochlorite).