Hi,
All the species you mentioned have the potential to be pathogens - just
give them the right conditions and they will take advantage.
One species of Streptococcus is responsible for the so-called "flesh-eating
disease."
Are you sure you have a species of Veillonella? It is an obligate
anaerobe and I don't believe it can tolerate oxygen AT ALL.
Staphylococcus is found all over the place. Some species (esp. S.
aureas) are responsible for food poisoning as they produce enterotoxins.
Anyway I hope this helps - maybe it will give you a start anyway.
Good luck!!
Shannon
University of Guelph
Microbiology Major
sseney at uoguelph.ca
