Note 598 — Chapter XII · ARTIFICIAL IMMUNITY AGAINST TOXINS

Ehrlich’s antitoxic unit is adopted by most investigators not only in Germany, but also in other countries. This unit corresponds to 1 c.c. of serum capable of neutralising 100 lethal doses of a standard toxin, i.e. that used to establish the first standard of antitoxin. The serum must be injected after being mixed in vitro with the toxin. The neutralisation must be complete and give rise to no symptom of intoxication.