Public Versus Individual Hygiene
The object of this book is primarily to instruct the individual as to what he can do to maintain his own individual health. But individual hygiene is only one particular branch of hygiene, and it is well for the individual, partly out of public spirit, partly in self-defense, to have some idea of the other important branches, namely, public hygiene, the hygiene practised by the health officer, semipublic hygiene, the hygiene of schools, institutions, and industrial establishments, and race hygiene or eugenics, the most important of all.
All these branches are so closely related that it is impossible to mark any exact dividing-line. But, in a general way, there is a broad distinction between eugenics, which is the hygiene of future generations, and the other two, which relate to the present generation, as also between these two themselves. Thus public hygiene is that which is practised by the government for its citizens, while individual hygiene is that which is practised by the citizens for themselves. Public hygiene consists chiefly in efforts by the government to maintain a wholesome environment in which to live, including good outdoor air—without smoke or foul odors—clean streets, pure water, good sewers, quarantine, and legal regulations concerning houses, schools, prisons, hospitals, and other public institutions, foods sold in markets, and conditions of employment. It is chiefly useful in preventing acute or infectious diseases, such as typhoid fever, scarlet fever, measles, whooping-cough, small-pox, yellow fever, and diphtheria, and in preventing accidents and occupational diseases. Individual hygiene is chiefly useful in preventing the chronic or degenerative diseases, that is, diseases of nutrition and of circulation, such as heart and kidney affections, nervous prostration, insanity.
Public hygiene has made much progress during recent years. In consequence, the number of deaths from the acute or infectious diseases has been greatly diminished. Health officers are beginning to demonstrate the truth of Pasteur’s words, “It is within the power of man to rid himself of every parasitic disease.”
It is this work which has reduced the general death-rate in civilized countries and sometimes cut it in two, as at Panama. The United States Public Health Service, on invitation of the Peruvian Government, recently cut the death-rate in two in one of Peru’s disease-ridden cities.
Individual hygiene, on the other hand, has been greatly neglected, especially in the United States, and, doubtless largely as a consequence, the death-rates from the chronic or degenerative diseases are increasing rapidly. A further consequence is that, in the United States, while the death-rate in the early years of life (when infectious diseases do most of the killing) has been decreasing, the death-rate in later life (when the chronic diseases do most of the killing) is increasing. In Sweden, on the other hand, where individual hygiene is more generally applied, the death-rate is declining at all times of life. (See “[Signs of Increase of the Degenerative Diseases],” [Supplementary Notes].)
Both public and individual hygiene are being invoked in the fight against tuberculosis, a disease at once infectious and chronic, due to germs and to wrong methods of living.
Cooperation Necessary
No matter how thoroughly an individual attempts to care for his own health, he will find it almost impossible to avoid infections, at times, without the organized help of the community in which he lives. A man may do his best to keep his windows open, to breathe deeply, to eat hygienically, to hold his activities within the limits of overfatigue, to screen his house against flies and leave no tin cans about his kitchen door to breed mosquitoes; but if the city in which he lives has no good air for him to breathe, if his city’s water supply is contaminated, if neighboring malarial swamps are not drained or covered with oil, if flies alight on the food before it comes to his own house, if the food contains disease germs or dangerous preservatives, or if his next-door neighbor visits him and leaves infection behind him, mere personal defenses will hardly be adequate.
Even in so private a matter as moving the bowels, sometimes the fault lies partly with circumstances beyond the control of the individual. Unfortunately in most of our cities and small towns “Comfort Stations” are rare or unknown, and when they are available they are often in such an insanitary condition as to be a source of danger through the spread of communicable disease. Constipation, as we have seen, is a far more serious matter than it is sometimes thought to be.