Disease the time between infection and the appearance of symptoms. The latency period is the time between infection and the ability of the disease to spread to another person, which may precede, follow, or be simultaneous with the appearance of symptoms. Some viruses also exhibit a dormant phase, called viral latency, in which the virus hides in the body in an inactive state. For example, varicella zoster virus causes chickenpox in the acute phase; after recovery from chickenpox, the virus may remain dormant in nerve cells for many years, and later cause herpes zoster (shingles). Diseases may be classified by cause,
Chronic disease in China will mandate an integrated and comprehensive approach to the control and prevention of cardiovascular disease, cancer, chronic respiratory disease, and diabetes. There will be priority actions in at least four areas: adult male smoking, hypertension, overweight and obesity, and capacity building for chronic disease control. The National Center for Chronic and Non-communicable Disease Control and Prevention (NCNCD) was established in 2002, under the leadership of the Chinese Center for Disease Prevention and Control (CDC), which is the technical counterpart of the Ministry of Health. NCNCD is the institution for chronic disease prevention and control at the national level and is