I don't think spoiled beer would kill you. Here is a list of what commonly can be found in spoiled beer.

Bacteria:
Lacic Acid Bacteria
Lactobacillus spp.
Pediococcus spp.
Acetic Acid Bacteria
Acetobacter
Acetomonas
Zymomonas spp.
Enterobacteriaceae spp.
Pectinatus spp.

Wild Yeasts:
Saccharomyces
Brettanomyces
Torulopsis, Pichia, and Candida

Wort, however, can make quite an attractive growth medium. Very important to make sure to boil it properly. Sterilize bottles and equipment with oxygen bleach.