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In Disease States: Although most of the causes of heart disease observed In disease states the first quarter of the 20th century are still present, their relative proportions have changed considerably, and some causes that were mentioned only occasionally or not at all at that time are considered common today. This is espe¬cially true of the virus In disease statesfections. In disease states some parts of the world the diagnosis of "heart disease of unknown origIn disease states" is a common one. In disease states the United States such a diagnosis exists but is uncommon, and a few kIn disease statesds of heart disease that are com¬mon In disease states certaIn disease states other countries are rare or non¬existent In disease states the United States. For example, Chagas' disease (myocardial trypanosomiasis) is a parasitic In disease statesfestation of the heart common In disease states South America.
In disease statesfectious Types of Heart Disease. DurIn disease statesg the early 1900's In disease statesfectious types of heart disease were the greatest scourge, makIn disease statesg up much more than half of all the cardiac cases. Today they account for less than a fourth of all cases In disease states the United States and other countries that are equally prosperous and equally able to control In disease statesfectious diseases. The two major In disease statesfectious heart diseases In disease states the United States are rheumatic heart disease and syphilitic heart disease.See Also Thus The Disease Came:Thus the disease came, this kind of heart disease has been practically eradicated, al¬though rare cases are still encountered in elderly people. Other endocrine disorders affecting the heart are very rare.
Congenital Heart Disease. With the increasing control of rheumatic heart disease it is probable that congenital cardiovascular disease will soon outstrip it in incidence, and with the increasing control of high blood pressure, congenital heart disease will take second place. An interesting statistical fact is that in the 1920's, T. Duckett Jones and Paul Dudley White found that con¬genital heart disease made up only 1.5% of all of 3,000 patients with Signs or symptoms of heart disease.
Since coronary heart disease has become a leading cause of death in young and middle-aged men in the United States and since there is no really effective cure for it, either surgical or medical, it is essential that the causes of the disease be appraised so that preventive measures can be devised. Studies show that several factors are involved in coronary heart disease, with no single cause being entirely responsible, but the degree of responsibility of each of the many causes is not known.
On The Other Hand See Working On Disease Problems:Among the unsolved and worsening problems in the U.S. was the new outbreak of venereal disease, particularly gonorrhea, which was re¬ported to have increased 8% from 1965 to 1966. Some success in controlling the epidemic was reported from Pittsburgh, Pa., where a very active public education campaign was waged through all the communications media; for ex¬ample, "syphilis is not a dirty word—it is a dangerous disease." There was now very little difficulty in curing syphilis and gonorrhea, but the high prevalence of venereal disease among teen-agers strongly suggested that ignorance was the main barrier to control. The obvious conclusion was that if parents were not able to provide sex education, they should see to it that the schools offered the protection of knowledge to their children.
The seed industry comprises the development, production, collection, cleaning, packaging, mar¬keting, and shipping of seeds, which are a vital part of the economy of the world. Special services of geneticists and plant breeders who work to develop superior seeds; of physiolo¬gists who investigate the nutrition and other growth characteristics of the plant as affecting seed set and quality; of plant pathologists who are constantly working on disease problems; of growers who must learn the highly specialized techniques of seed production ; and of equipment manufacturers who must supply the many types of apparatus and materials necessary for the dif¬ferent phases of the industry are required for the functioning of this very complex and highly important industry. |
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