In the above letter to Galton she says that public health authorities should not content themselves with identifying the strains of bacteria that produce Leprosy, Typhoid, and Diptheria but should instead emphasise the impact of bad sanitation in causing them. This is not the same as saying that germs do not play any role in these diseases. This viewpoint is logical and consistent with her statements - in her Quain's article 11 years earlier - that antiseptic precautions are necessary in hospital to stop the spread of disease through germs.
It’s commonly been stated that it’s important to finish your course of antibiotics (whether “your” refers to a person or animal), as a means of reducing the risk of developing antibiotic resistance. That’s never made much sense to me, since more antibiotic exposure is more likely to lead to a risk of resistance emerging. However, it’s been dogma. The issue was addressed a few years ago in the ACVIM Consensus Statement on Antimicrobial Use in Animals . It also comes up in some working group that I’m in regarding antimicrobial use in humans and in animals, as messaging is starting to move away from “complete the course.” It’s a challenge though, since we don’t want treatment stopped too early (reducing effectiveness), but we also don’t want treatment to continue for days after it’s not needed.