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Desislava Nikolova, health editor for Bulgarian newspaper Capital Weekly, reportedly complained, "Bulgarian authorities knew, for a while now, exactly when the first vaccines were arriving. It perplexes me why the government needed to use a hot dog truck instead of a vehicle licensed for distribution of thermolabile medicines."

The separate action of these substances can be studied since one is thermolabile, or destroyed by heating the serum to one hundred and thirty-three degrees; the other thermostabile, or capable of withstanding a greater degree of heat.

The thermostabile substance, or amboceptor, as it is generally called, has in itself no destructive action on the bacteria; but in some way so alters them that they can be acted on by the thermolabile substance called complement whose action is destructive.