LONDON/NAIROBI, March 11 (Reuters) - Governments and global health groups are working to try to fill the most urgent gaps in the fight against diseases such as malaria and HIV, including sharing tests and treatments internationally, after the U.S. government froze foreign aid funding.

The Trump administration said this week it has cut more than 80% of programmes, which health groups say threatens efforts to tackle deadly diseases across the globe. Some programmes have survived or been reinstated, but funding remains scarce, and the future unclear.

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