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The United States is going to wind down health assistance to Zimbabwe after negotiations over funding collapsed.

The US embassy in Zimbabwe said Washington had offered $367 million over five years to support Zimbabwe's priority health programmes.

They include HIV treatment and prevention as well as tuberculosis and malaria.

But the Zimbabwean authorities rejected it, saying Washington was demanding too much sensitive health data in return.

In effect, they said, they were being asked to provide the raw materials for scientific discovery without assurance they'd be able to access the products that came from it.

Rashida Ferrand is a professor at the London School of Hygiene and Tropical Medicine.

She's lived in Zimbabwe for the past 20 years and her research focuses on HIV in children and young adults.

She thinks the impact will be severe.

So why exactly did the government in Harare pull out of the deal?

Our correspondent there is Shingai Nyoka.

Zimbabwe essentially is saying that the US's demands are an unequal exchange, that they're lopsided, that Zimbabwe is being asked to share sensitive data that

in terms of its biological resources, biological samples related to disease control over an extended period of time without any real guarantee that Zimbabwe would benefit from any kind of research in terms of vaccines and treatments.