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 .
1. What is the main cause of HIV?2. What is AIDS?3. What was the record number of new HIV cases diagnosed in Britain last year?4. What is the global epidemic of HIV?5. What is the virus that causes AIDS?6. What is the summary of the text in 20 words?