Remember, John Snow was an armchair epidemiologist.

https://www.practicalplaybook.org/success/story/map-making-and-myth-making-john-snows-map-didn%E2%80%99t-solve-1854-cholera-outbreak

And the guy who checked his work was a priest.

http://kora.matrix.msu.edu/files/21/120/15-78-7C-22-1854-10-Whitehead.PDF

http://kora.matrix.msu.edu/files/21/120/15-78-7D-22-1855-07-CIC-Whitehead.pdf

So if you are interested, get out there and read. Because it sure seems like others aren't.

At this point the number of people I bump into who now say to me, "yeah, it seems pretty obvious it's in the air" outweighs the number who mention droplets.

https://twitter.com/jmcrookston/status/1322609600710008833

Links to many studies and books in both timelines. https://twitter.com/jmcrookston/status/1336356403729092612

Learn IPAC, here: https://www.publichealthontario.ca/en/education-and-events/online-learning/ipac-courses

WHO training courses. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/training/online-training

The WHO courses above are COVID-19 related.

CDC epidemiology textbook (free): https://twitter.com/jmcrookston/status/1297248626662670337

Seminal measles outbreaks. Links to papers are there too:

1. https://its-airborne.org/historical-timeline.html#event-outbreak-three-children-catch-measles-at-doctors-office-an-hour-after-index-patient-left-remington-article

2. https://its-airborne.org/historical-timeline.html#event-outbreak-one-child-infects-seven-in-a-physicians-office-bloch-article

3. https://its-airborne.org/historical-timeline.html#event-outbreak-exposire-to-measles-feared-at-sports-event