Your body has many ways of defending itself against viruses, bacteria and other germs. Together these defences give your body natural immunity against infection.

The first Africans slaves were introduced in America by a A Dutch trader who exchanged 20 slaves for food in Jamestown Virginia in August, 1619.

Variola or smallpox were black in the past, one of the most serious disease, mainly due to the high mortality rate. In less dangerous forms were about 30%, more serious forms of up to 50%. Since 1979, smallpox is not regarded as the world eradicate.

In todays’s world nothing has become more apparent than the threat of bioterrorism. The United States has become more aware of this threat since September 11, 2001. The health care professionals and public health authorities have become more aware of the threat of biological or chemical attacks.

Bio-terrorism is terrorism involving the intentional release or dissemination of biological agents (Bacteria, viruses or toxins), that may be in a naturally-occurring or in a human-modified form.

An explanation of the achievements and the disasters that resulted from the meeting of cultures.

Crazy ways people have died.