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Certain Disease States: Although most of the causes of heart disease observed in 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 infections. In some parts of the world the diagnosis of "heart disease of unknown origin" is a common one. In the United States such a diagnosis exists but is uncommon, and a few kinds of heart disease that are com¬mon in certain disease states other countries are rare or non¬existent in the United States. For example, Chagas' disease (myocardial trypanosomiasis) is a parasitic infestation of the heart common in South America.
Infectious Types of Heart Disease. During the early 1900's infectious types of heart disease were the greatest scourge, making up much more than half of all the cardiac cases. Today they account for less than a fourth of all cases in the United States and other countries that are equally prosperous and equally able to control infectious diseases. The two major infectious heart diseases in the United States are rheumatic heart disease and syphilitic heart disease.See Also Plant Disease:Like other bloodsucking insects, female flies can spread disease, and they are know transmit anthrax, tularemia, and surra. I when they do not spread disease, their bites painful, and the flies may remove enough b to lower an animal's vitality. The male horse unlike the female, feeds mainly on nectar plant disease sap.
Like other bloodsucking insects, female flies can spread disease, and they are know transmit anthrax, tularemia, and surra. I when they do not spread disease, their bites painful, and the flies may remove enough b to lower an animal's vitality. The male horse unlike the female, feeds mainly on nectar plant disease sap.
On The Other Hand See Tropical Disease:Thus, 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.
The problem of disease control also looms large. For centuries, certain regions have svipported traditional crops. As a result, disease organisms have evolved strains so resistant that only highly organized systems of agriculture, such as the plantation system, can cope with the prob¬lem to give economical and dependable returns. Complicating the whole picture is widespread illiteracy with an accompanying lack of competent personnel. Training of vast numbers of local tech¬nicians takes time. Meanwhile, soil survey teams needed for the development of rehabilitation proj¬ects, as well as practically all technical staff, have to be imported.
tropical disease Agricultural Economics.—The eco¬nomics of tropical disease agriculture can no. longer be separated from the world agricultural picture. The field as a whole, especially that of food produc¬tion, has been explosively dynamic. The over-all trend in the tropics since 1947 reveals a general increase in production. However, population growth, due to an increased birth rate and a de¬creased death rate, has caused per capita produc¬tion in these regions to remain at its prewar level of about 40 percent of that of the more developed countries. |
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