BERLIN, July 15 (Reuters) - German Health Minister Jens Spahn called on China to make it possible for investigations into the origins of the COVID-19 pandemic to continue, saying more information was needed. Speaking during a visit to the World Health Organization headquarters in Geneva on Thursday, Spahn also announced a 260 million euro ($307 million) donation to WHO"s ACT-Accelerator programme, which aims to ensure the entire world, including poorer countries, receive coronavirus vaccines and tests. "I call on China to make it possible for the investigations into the origins of COVID to be continued," he said. ($1 = 0.8465 euros)