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Recognizable Disease In: 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 behavior of the Burkitt virus resembles that of poliomyelitis virus: it is very widespread and causes few or no distinctive symptoms when it infects children, but it may cause a ,recognizable disease in disease in adults. Moreover, its spread is more rapid under conditions of poor sanitation; hence populations with high eco¬nomic standards and good sanitation facilities have a high proportion of susceptible adults who in childhood did not become infected and thereby immunized against the virus. The preva¬lence of infectious mononucleosis among young adults is thus explained.See Also Epidemic Disease: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.
Quarantine had no adequate scientific founda¬tion until the last half of the 19th century, when the causative agents and modes of transmission of many of the important epidemic diseases were discovered. Before these discoveries interna¬tional commerce and travelers suffered serious interference because of conflicting and unpre¬dictable quarantine procedures and practices en¬countered. After the discoveries of the causes and mode of spread of epidemic diseases, the quarantine measures directed to halt them or prevent their introduction into new areas were the subject of intensive scientific research.
On The Other Hand See Disease Resistance:FMD' is caused and transmitted by a picorna virus (one of the smallest known disease resistance-pro¬ducing organisms) of which there are seven major types and at least 50 subtypes. The great variety of strains is both a bane and a blessing to the veterinarian. Each strain has its own idio-syncracies in such characteristics as antigenic-ity and resistance to control. These differences, however, often aid the epidemiologist in pin¬pointing the geographic area from which the disease resistance was transmitted.
RESISTIVITY, re-zis-tiv'i-ti, or SP! CIFIC RESISTANCE, spe-sif'ik re-zis'ta: the resistance offered by a cubic centimeter oi substance to the passage of electricity, the curn being perpendicular to two parallel faces. Usua expressed in ohm-centimeters, it is reckoned w the metal at the freezing point of water. In 1 equation p = RA/l, p is the resistivity, R 1 resistance, A the cross-sectional area, and / t length. See also ELECTRICITY—3. Direct Elect, Current (Resistance).
RESISTpRS, Electric. See ELECTRIC Ci CUITS—Circuit Elements (Resistance, Inductan and Capacitance). |
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