Licence: In copyright
Credit: One injection up to 4 days of adequate penicillin activity : Benapen. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/b28686640_0002.jp2/full/800%2C/0/default.jpg)
Licence: In copyright
Credit: One injection up to 4 days of adequate penicillin activity : Benapen. Source: Wellcome Collection.