I picked this book up at an antique store in Ohio. Printed in 1915, it was a school book, likely both in NYC and in the rural Ohio town I found it in.
After the general acceptance of germ theory, but before antibiotics were available, great emphasis was put on preventative medicine and hygiene. In fact, it was part of everyday school curriculum.
What make this little special is not just its advice on avoiding typhoid; after being in the hands of about fifteen years worth of bored school children, vandalism and doodlings have turned this book into a piece of outsider art.