SkyDream

Epidemiology is often defined as the study, distribution, and determinants of disease and injuries in the human population. Human growth occurs along a genetically destined trajectory but is influenced by environmental factors consequently affecting its longevity and health status. We need to consider not only the man’s physical environment but also his social, cultural, and psychological circumstances. For instance, environmental components of causation lie in lung cancer and degenerative arterial disease as in tuberculosis and smallpox. INFECTIOUS DISEASES: There exist a competitive interaction between man and environment. Man has been able to control his nearby environment or at least mitigate its worst effects by various adaptive mechanisms.  On one hand, this struggle may be against unalterable and passive opponents, e.g. physical and climatic factors , and on the other hand, the biological environment which is in itself capable of adaptive responses. Therefore, in the contex...