This 64 oz capacity, blow-molded plastic bottle was used by Connaught Labs in Toronto and is of the sort used to store Salk and Sabine polio vaccine concentates. The inscription on the blue plastic screw cap reads “NALGENE / ½ GALLON.” Plastic bottles of this sort were introduced to market in 1965. They were less likely to break than glass bottles, and so lowered cost of vaccines and medicines.
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