Sophie Cousins

On receiving the 1945 Nobel Prize in Medicine for discovering penicillin, Alexander Fleming finished his lecture with a warning: ‘There is the danger,’ he said, ‘that the ignorant man may easily underdose himself and by exposing his microbes to non-lethal quantities of the drug make them resistant.’ Antibiotic resistance is now one of the biggest threats to global health, food security and development. It could kill as many as 10 million people a year by 2050.

Ousainou Sarr came to the UK from Gambia more than two decades ago. For two years he experienced typical tuberculosis symptoms – weight loss, profuse night sweats, a persistent cough – but his GP never suspected he might have TB. He was living rough on the streets of London, the TB capital of Western Europe, when the Find & Treat van offering TB screening arrived. The van is a specialist NHS outreach service that aims to tackle TB among homeless people, drug or alcohol users, vulnerable migrants and ex-prisoners across the UK, by providing screening and access to care. More than 9000 cases of TB were diagnosed in the UK last year.

The 21st International Aids Conference was in Durban last week. The last time it was held here, 16 years ago, Aids denialism in South Africa was rife, people were dying on the front lawns of hospitals, unable to access treatment, and President Thabo Mbeki had announced that Aids was caused not by a virus, but by poverty and poor nourishment. A lot of progress has been made since then.