The Cambodian government has recently announced a clampdown on unlicensed doctors. This comes after a mass infection of HIV in a rural village, blamed on an unlicensed doctor re-using syringes. The "doctor", recently convicted of manslaughter, has just begun a 25 year prison sentence.

For millions of people, self-taught, unlicensed doctors are often their cheapest - and only - option if they fall ill. Cambodia has one of the world's lowest numbers of doctors per head of population, on a par with Afghanistan. For Crossing Continents, John Murphy travels outside the capital Phnom Penh to see whether the government clampdown is having an effect. He finds evidence that self-taught doctors are still operating in villages, without hindrance - and with plenty of local support. Producer Helen Grady.