bbcnews The US has officially withdrawn from the World Health Organization (WHO), leaving the UN agency without one of its biggest donors. US President Donald Trump signed an executive order signalling the withdrawal a year ago, having criticised the organisation for being too "China-centric" during the Covid pandemic. Part of the United Nations, the WHO aims to promote health, keep the world safe and serve the vulnerable. The US Department of Health and Human Services said it took the decision due to the WHO's alleged "mishandling" of the pandemic, an inability to reform and political influence from member states. Those claims have been rejected by WHO and its director general Tedros Adhanom Ghebreyesus said the withdrawal was as a loss for the US and the world. The organisation pointed to its global efforts to combat polio, HIV aids, maternal mortality and its international treaty on tobacco control.