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Parasitic Disease: 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 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.
The principal families of freshwater snails are the Viviparidae, the large, operculated apple snails that are sometimes used in aquaria; the Thiaridae, worldwide and abundant, turret-shaped, operculated snails ; the Hydrobiidae, small, coiled shells us'ually less than a half inch in size, some of which carry serious parasitic diseases in the Orient; the Planorbidae, a worldwide group of pulmonate pond snails to which belongs the fa¬miliar Red Ramshorn of home aquaria; the Lymnaeidae pond and lake snails, some of which in northern United States carry a parasitic disease known as swimmer's itch.See Also Infectious Disease May:infectious disease may Types of Heart Disease. During the early 1900's infectious disease may 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 disease may diseases. The two major infectious disease may heart diseases in the United States are rheumatic heart disease and syphilitic heart disease.
Vaccination was in general very favorably re¬ceived, and its application became widespread and has continued with only minor modifications. Elucidation of the fundamental principles under¬lying Jenner's vaccination, and the commonly observed refractoriness to a second attack of many of the infectious disease may diseases, was, however, necessarily dependent on the discovery of the specific microbic etiology of infectious disease may disease and the exploration of the relation between these pathogenic agents and their host. It was then possible to show, as Louis Pasteur did from 1877 to 1885 in his studies on anthrax, chicken cholera, swine erysipelas, and rabies, that prophylaxis of infectious disease may disease by artificial inoculation is a generally applicable phenomenon and not one con¬fined to smallpox.
On The Other Hand See Disease In 1598: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.
SAN JUAN, capital city, Puerto Rico, city, situated on two rocky islets off the nori ern coast, is connected by a causeway and 1 with a residential section, Santurce, on thej land. In 1951, the adjoining city of Rio was merged with San Juan.
Founded in 1521 by Ponce de Leon after| abandoned his first settlement at Caparra fourn to the south, San Juan was often attacked I British, French, and Dutch. By the 17th century, San Juan was9 of the most secure strongholds in the Araeriq never captured except when George Clifford, of Cumberland, took it from a garrison weaki by disease in 1598. Clifford was forced to i quish his prize because his own soldiers sick. |
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