Paragraph Improvement - 2 (SAT)

In context, what is the best way to improve the underlined part of sentence 9 (reproduced below)?
By these put the human body

Directions for the question:

The following passage is an early draft of an essay. Some parts of the passage need to be rewritten. Read the passage and select the best answer for the question that follows. Keep in mind that some questions are about particular sentences or parts of sentences and ask you to improve sentence structure or word choice. Other questions ask to consider organization and development. In choosing the answer, follow the requirements of standard written English.

[1] There are two principal methods of treating disease. [2] One is the combative, the other the preventive. [3] The trend of medical research henceforth has almost entirely been along combative lines, although the progressive physician learns to work more and more along preventive lines. [4] The slogan of medical science has been, "Kill the germ and cure the disease." [5] The usual procedure is to wait until acute or chronic diseases have fully developed, and then, if possible, to subdue them by means of drugs, surgical operations, and by means of the morbid products of disease, in the form of serums, antitoxins, vaccines, etc.
[6] The combative methods fight disease with disease, poison with poison, and germs with germs and germ products. [7] In the language of the Good Book, it is "Beelzebub against the Devil." [8] The preventive method does not wait until diseases have fully developed and gained the ascendancy in the body, but concentrates its best endeavors on preventing, by hygienic living and by natural methods of treatment, the development of diseases. [9] By these put the human body in a normal and healthy condition which is practically proof against infection or contagion by disease taints and miasmas, and against the inroads of germs, bacteria and parasites.
[10] The question is, which method is the most practical, the most successful and most popular? [11] Which will stand the test in the great struggle for existence?
[12] The medical profession has good reason to be alarmed by the inroads made in its work by irregular, unorthodox systems, schools and cults of treating human ailments. [13] But instead of raging at the audacious presumption of these interlopers, would it not be better to inquire if there is not some reason for the astonishing spread and popularity of these therapeutic innovations?