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In this interesting book Dr. Chapin sets forth what is known of the sources and modes of infection in the case of the common, important infectious diseases, and with special reference to practical preventive measures. In Chapter 1 he reviews the evidence of growth of disease germs outside the body, reaching the general conclusion that in temperate climates this does not occur to such extent as to play an important part in causing disease. The second chapter is devoted to carriers and missed cases, the great importance of which, in spreading infectious diseases, is brought out clearly and forcibly. "Any scheme of prevention which fails to take into account carriers and missed cases is doomed to partial and perhaps complete failure." Chapter 3 deals with the limitations to the value of isolation and whether one agrees with all the statements or not, there is much here especially for health officers
The Sources and Modes of Infection. JAMA. 1911;LVII(2):146. doi:10.1001/jama.1911.04260070150031
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