Figure 1. Advertisement for type-specific anti-pneumococcal sera from the March 1931 issue of the Canadian Medical Association Journal. The text in this advertisement describes advancements in the preparation of antibody solutions and emphasizes the need for using type-specific serum in the therapy of pneumococcal pneumonia. Note the suggestion that type-specific serum can be mixed for empiric therapy of pneumonia. (Preprinted with permission.)
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