May 23 (Reuters) - The World Health Organization does not have evidence that the monkeypox virus has mutated, a senior executive at the U.N. agency said on Monday, noting the infectious disease that … [+498 chars]Read the whole story by on Reuters:https://www.reuters.com/business/healthcare-pharmaceuticals/who-says-no-evidence-monkeypox-virus-has-mutated-2022-05-23/