The following articles are available to everyone. Other plasma lipids and lipoproteins also play a role in the pathogenesis of atherosclerosis, but their importance in prevention and treatment of vascular disease is less well defined. With increasing travel, immigration, use of immunosuppressive drugs and the spread of AIDS, physicians anywhere may see infections caused by previously unfamiliar parasites. When patents expire on brand-name drugs, generic formulations become available that often cost much less. Some physicians, however, hesitate to prescribe the less expensive drug because of concerns about the quality of generic formulations.
Sunburn is the visible acute injury, but immunosuppression also occurs.
Chronic effects include degenerative changes such as wrinkling and pigment alterations, and DNA damage leading to premalignant actinic keratoses, basal and squamous cell carcinoma, and probably malignant melanoma. Recently, some experts have questioned the use of sunscreens to prevent skin cancer. Legal requirements for entry and epidemiological conditions in different countries vary from time to time, often unpredictably, but some reasonable recommendations can be made. Also, find out about our Advice For Travelers program on CD-ROM . It is available in other countries as Rabipur .