Tuberculosis is caused by airborne bacteria that mostly affects the lungs. Roughly a quarter of the global population is estimated to have TB, but only about 5–10% of those develop symptoms.

The World Health Organisation reports that tuberculosis cases have reached an all-time high, with over 8 million diagnoses last year, marking its return as the leading infectious disease killer.

More than eight million people were diagnosed last year

Tuberculosis is caused by airborne bacteria, which mostly attack the lungs. Around a quarter of the world's population is thought to have tuberculosis, yet only about 5-10 per cent develop symptoms.

It mostly affects people in Southeast Asia, Africa and the Western Pacific

The World Health Organization says more than 8 million people were diagnosed with tuberculosis last year.