I'm a cholera buff myself. The disease fascinates me. A disease with an untreated fatality rate of 60% and a treated fatality rate of 15% demands respect.
This 140-page book of 8 chapters, with a faintly fecal-colored cover, describes a trail of research by an erudite investigator. As he says in the introduction, he has "dwelt only on those aspects where I have some personal observations to make" on the basis of ten years of study. So it's not complete, but it leaves a lasting impression of the importance of the subject.
And why should cholera be of interest in the U.S.A.? For the same reason that smallpox should worry us as "at any time during these days of air-travel, it may be exported from India by air, in spite of all possible precautions." Probably many readers don't realize that Asiatic cholera struck the U.S.A. in 1832, 1855, and 1873