If you can not buy pasteurized milk, and are not sure of conditions about the dairy, your milk should be boiled, or, still better, sterilized at home by putting it in bottles or other containers, and placing in a vessel of hot water, keeping the milk for several hours about half-way to the boiling point, then cooling gradually.
All these means of prevention are troublesome and require time and work, but as the result in health for the family is sure, every housekeeper should gladly take this extra burden on herself if it be necessary. In some states and many cities, the laws governing dairies are now so strict that there is no need of doing this work in the home. This care in the dairies should be insisted on everywhere, even if it raises the price of milk, because it means the saving of many doctor and drug bills and also raises the standard of public health.
Yellow fever was formerly dreaded more than any other single disease because it was so wide-spread, so fatal, and was thought to be violently contagious, but during the Spanish-American War it was proved that it is not contagious at all, but comes only from the bite of a certain mosquito, the stegomia, which is usually found only in hot climates. It is conveyed in this way: the mosquito bites a yellow fever patient; for twelve days it is harmless, but after that time it may infect every person that it bites.
If every yellow fever patient could be screened with netting to prevent his being bitten, we could prevent the yellow fever mosquito from becoming infected. Further, if we can prevent healthy people from being bitten by fever-infected mosquitoes, they will escape the disease, and still further, if we can destroy the eggs of mosquitoes, we can entirely obviate all danger of yellow fever in a community.
The mosquito breeds only in water; by having all cisterns, rain-water barrels, and other water containers carefully covered, and by spreading the surface of pools of standing water, especially dirty water, covered with greenish scum, with a thick coating of kerosene oil, we can prevent the eggs from hatching. This has been done in many communities in Cuba and the southern part of the United States, and has resulted in completely stamping out the disease in those places.
Malaria is caused by another mosquito, called the anopheles and while malaria is seldom fatal as is yellow fever, it causes much suffering and loss of time, and strong efforts should be made to prevent it. The same measures that are used to prevent yellow fever will banish malaria from any community. They are the screening of patients to prevent spreading the disease; screening all houses closely and keeping close watch for mosquitoes in the house, and covering all ponds in the neighborhood with oil. New Jersey mosquitoes were formerly known far and wide, but such an active campaign has been waged against them, that they have been almost completely driven from the state.
The ordinary mosquito has never been found to do any harm beyond the discomfort of its bite.
Of other diseases caused by insects, an affection of the eyes called pink-eye is carried by very tiny flies, and the dreaded bubonic plague is supposed to be transferred from sick people to well ones by the bites of fleas, which in turn are brought to this country by rats.
The hook-worm which affects so many persons in the South is often called "the lazy disease" since the persons afflicted with it are not totally disabled, but are lacking in energy and vigor because the small insects take from the blood the red corpuscles which should carry the digested food all over the body. These insects can be destroyed by medicine, of which only a few cents worth is required to cure a case and make the patient fit for work and enjoyment. In Porto Rico almost 300,000 cases have been treated by the United States government in the last six years.
Another matter which should receive careful consideration is the large number of preventable accidents. Mining accidents come in a few cases from failure to provide the best appliances in the mines, but in many cases are due to carelessness or ignorance of the operators themselves. There still remain a large number of accidents which occur in the best regulated mines, and when no instance of special carelessness can be traced. For years these disasters have puzzled mining engineers, but within the last few months it has been discovered that the minute particles of coal dust in a dry mine completely fill the air, so that the air itself is ready to burn.