The number of people in the UK infected by HIV , the virus that causes Aids , increased by almost 20 per cent last year to nearly 50,000 .
The number of people in the UK infected by HIV , the virus that causes Aids , increased by almost 20 per cent last year to nearly 50,000 .
The global epidemic of HIV , the virus that causes Aids , is tightening its grip on Britain with a record number of new cases diagnosed last year .