Webmedic
Strep is a natural inhabitant on the intestines !! Its only pathogenic when it multiplies in the wrong place.
Have a look at this link from the textbook of bacteriology
http://textbookofbacteriology.net/normalflora.html if its always pathogenic then we are all doomed as its in our intestines naturally like it or not.
Did you check the medline links to the tests showing strep use as a beneficial probiotic.
Sorry if I seemed to be coming on hard on you but I do not like seeing mis-information posted along side helpful information.
You have to know what to look for when reading Material Data Safety Sheets or even the FDA sheets. For example - a well known colon cleanser and oxygenator contains Magnesium Oxide or Magnesium Peroxide - if you read the safety sheet then you would never allow these products near your body - but when you do some research then you find that there are different grades and some are classified as food grade. So you need to dig a little deeper to find the reality. Apologies if you took any offence.
Also - I think the active bacteria in flora balance and threelac are transient - non colonising bacteria - so you will still need to replenish with good bacteria.
Fermented vegetables is a great way to do this - make your own cabbage rejuvalec or sauerkraut (dont buy it - pasteurising kills the beneficial microbes) Or make your own Kefir if you can handle lactic acid in dairy.