Stock Photo: Diphtheria antitoxin was made by inoculating horses with diphtheria bacteria, then bleeding the animals to obtain their blood serum. The serum neutralized the diphtheria toxin causing the patient’s symptoms.

Diphtheria antitoxin was made by inoculating horses with diphtheria bacteria, then bleeding the animals to obtain their blood serum. The serum neutralized the diphtheria toxin causing the patient’s symptoms. : Stock Photo

4048-5920 | Rights Managed
Credit: Everett Collection / Everett Collection
Category: Historical
HISL015_EC058_H

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