https://old.reddit.com/r/AskReddit/comments/15shhd4/who_was_...

> "He didn't discover it, he was told by midwives over and over and over until he looked into it. Midwives at the hospital observed that when doctors delivered babies, mothers were at a higher risk. Any housewife knew that food would spoil faster if handled with dirty hands and they always used vinegar solutions to clean their hands, tools, and surfaces. Any housewife would do this and midwives did it because mothers and their babies are more important than pumpkin preserves. Only doctors never washed their grubby hands while it was a deeply ingrained habit in most midwives. Semmelweis listened to women. No wonder they locked him away."

Which is uncited/unsupported, but back in the Black Death time of the 1660s: "The villagers established a system of boundary stones around the village’s periphery, boring holes into the rocks and leaving coins soaked in vinegar – they believed it acted as a disinfectant – in the holes. Merchants from surrounding villages would collect the money and leave bundles of meat, grains and trinkets in return." - https://www.bbc.com/travel/article/20151026-the-sleepy-villa...

And from the same Reddit thread:

> "Oh again with this "before Germ Theory no one knew anything about disease!" bullshit. We always knew dead and dirty things caused disease. Dead animals for artillery ammo, dead animals buried by wells, leaving your swords in latrines. We also knew how copper and silver could help heal and prevent disease."

So, it's not like Semmelweiss proposed Germ Theory, or was the first to observe a connection between death and disease, or between 'disinfectant' of some kind and reduced disease. And https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1299347/ says:

> "(notably Alexander Gordon of Aberdeen) had shown that puerperal fever was contagious some 40 years before Semmelweis. The mortality rate in lying-in hospitals did not fall but rose after Semmelweis' treatise was published, and his ‘much-cited but seldom-read’ thesis is immensely long (over 500 pages) and so badly written that it is almost unreadable. [...] Semmelweis deserves to be remembered for his observation in 1847 that making medical students wash their hands in a disinfectant solution before going from the post-mortem room to the lying-in wards of the Vienna lying-in hospital, led to a fall in mortality due to puerperal fever from a very high level to a moderate level. [...] After his death in 1865, Semmelweis was totally forgotten, not only in Vienna but also in Hungary where he was born and to which he returned in 1850. It was not until the late nineteenth century that the introduction of Listerian antisepsis applied to obstetrics led to a steep fall in deaths from puerperal fever. Only then was Semmelweis' work recalled and his faults forgotten."

Which is fine, he shouldn't be knocked, but how did it take 200 years for humans to decide to use the tools that were already internationally known (vinegar) to a large number of people (housewives, midwives) to avoid some kind of death-related contamination, on childbirth and hospital and post mortem scenarios? And why did it take a guy writing a 500 page near-psychosis rant?

Was that low hanging fruit and if so, how much more of that is still in the world today?