We know of 11,218 people in the UK who have been infected with the virus that leads to AIDS. It's the number we don't know of that's even more worrying. White poster with grey overlay and white text. Caption: We know of 11,218 people in the UK who have been infected with the virus that leads to AIDS. It's the number we don't know of that's even more worrying. Country: UK. Agency: HEA. Main Theme/Approach: World AIDS Day. 1980s-1990s