World AIDS Day

World AIDS Day, designated on December 1 every year since 1988, is dedicated to raising awareness of the AIDS pandemic caused by the spread of HIV infection, and mourning those who have died of the disease. Government and health officials, non-governmental organizations and individuals around the world observe the day, often with education on AIDS prevention and control.

World AIDS Day is one of the eight official global public health campaigns marked by the World Health Organization (WHO), along with World Health Day, World Blood Donor Day, World Immunization Week, World Tuberculosis Day, World No Tobacco Day, World Malaria Day and World Hepatitis Day. Since 1995, the President of the United States has made an official proclamation on World AIDS Day.

As of 2013, AIDS has killed more than 36 million people worldwide (1981-2012), and an estimated 35.3 million people are living with HIV, making it one of the most important global public health issues in recorded history. Despite recent improved access to antiretroviral treatment in many regions of the world, the AIDS epidemic claims an estimated 2 million lives each year, of which about 270,000 are children.

World

World is a common name for the whole of human civilization, specifically human experience, history, or the human condition in general, worldwide, i.e. anywhere on Earth or pertaining to anywhere on Earth.

In a philosophical context it may refer to:

In a theological context, world usually refers to the material or the profane sphere, as opposed to the celestial, spiritual, transcendent or sacred. The "end of the world" refers to scenarios of the final end of human history, often in religious contexts.

World history is commonly understood as spanning the major geopolitical developments of about five millennia, from the first civilizations to the present.

World population is the sum of all human populations at any time; similarly, world economy is the sum of the economies of all societies (all countries), especially in the context of globalization. Terms like world championship, gross world product, world flags etc. also imply the sum or combination of all current-day sovereign states.

HIV

The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and over time acquired immunodeficiency syndrome (AIDS). AIDS is a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. Without treatment, average survival time after infection with HIV is estimated to be 9 to 11 years, depending on the HIV subtype. Infection with HIV occurs by the transfer of blood, semen, vaginal fluid, pre-ejaculate, or breast milk. Within these bodily fluids, HIV is present as both free virus particles and virus within infected immune cells.

HIV infects vital cells in the human immune system such as helper T cells (specifically CD4⁺ T cells), macrophages, and dendritic cells. HIV infection leads to low levels of CD4⁺ T cells through a number of mechanisms, including pyroptosis of abortively infected T cells,apoptosis of uninfected bystander cells, direct viral killing of infected cells, and killing of infected CD4⁺ T cells by CD8 cytotoxic lymphocytes that recognize infected cells. When CD4⁺ T cell numbers decline below a critical level, cell-mediated immunity is lost, and the body becomes progressively more susceptible to opportunistic infections.

Prince Harry

Prince Henry of Wales, KCVO (Henry Charles Albert David; born 15 September 1984), commonly known as Prince Harry, is the younger son of Charles, Prince of Wales, and Diana, Princess of Wales. At the time of his birth, he was third in the line of succession to succeed his grandmother, Queen Elizabeth II, but is currently fifth in line after his nephew, George, and niece, Charlotte.

After an education at schools in the United Kingdom and spending parts of his gap year in Australia and Lesotho, Harry chose a military career, undergoing officer training at Royal Military Academy Sandhurst. He was commissioned as a Cornet into the Blues and Royals of the Household Cavalry Regiment, serving temporarily with his brother, and completed his training as a troop leader. In 2007–2008, he served for 77 days in Helmand, Afghanistan but was pulled out following publication of his presence there by an Australian magazine. He returned to Afghanistan for a 20-week deployment in 2012–2013 with the Army Air Corps. He left the army in June 2015.