In 1840, surgeon George Bodington noted that those who worked in the open air ​ — farmers, plowmen, shepherds — ​ were generally free of TB, while those who spent much of their time indoors seemed more susceptible to it.
Pada 1840, ahli bedah George Bodington mengamati bahwa orang yang bekerja di tempat terbuka, seperti petani atau peternak, umumnya tidak terkena TB, sedangkan orang yang sering bekerja di dalam ruangan kelihatannya lebih rentan.