Prevention And Control Of A Healthy Immune System Essay examples

1343 Words Oct 6th, 2015 null Page
Immunisation is postulated to have saved millions of lives worldwide and therefore is considered to be one of the most powerful means of preventing the spread of disease. In 2012, the World Health Organization estimated that vaccination prevents 2.5 million deaths each year. With 100% immunization, and 100% efficacy of the vaccines, one out of seven deaths among young children could be prevented, mostly in developing countries, making this an important global health issue.The World Health Organization (WHO) also reports that immunisations are available to prevent or contribute to the prevention and control of twenty-five diseases. Despite the evident advantageous aspects of immunisations, there is an attempt to find balance between the autonomy of an individual versus the risk to public health. ✔
Powerful and concise opening paragraph.

The key to a healthy immune system is its exceptional ability to distinguish between the body’s own cells and foreign cells. The body’s immune defenses normally coexist peacefully with cells that carry distinctive “self” marker molecules (see Figure 1). But when immune defenders encounter cells or organisms carrying markers that say ‘foreign’, they quickly launch an attack. Anything that can trigger this immune response is called an antigen. An antigen can be a microbe such as a virus, or even a part of a microbe. Tissues or cells from another person also carry nonself markers and act as antigens. This explains why tissue transplants may…

Related Documents