Vaccinators went from one area to another on horseback, donkey or foot, and when they had thermoses, it was practically impossible to keep them cooled, which meant the vaccine was “subject to contingencies from ambient temperature” , p.157.
Los vacunadores se trasladaban de una localidad a otra a caballo, mula o a pie, y cuando sí contaban con termos era prácticamente imposible conservarlos fríos lo que ocasionaba que la linfa quedara “sujeta a las contingencias de la temperatura ambiente” , p.157.