By Julie Steenhuysen CHICAGO (Reuters) -It will take $15 billion in grants this year and another $10 billion annually after that to establish and maintain an adequate toolkit to respond to COVID-19 and address future pandemic threats, according to four organizations focused on global health and the economy. The estimate is laid out in “A Global Strategy to Manage the Long-term Risks of COVID-19,” a working paper published on Tuesday by the International Monetary Fund, in partnership with the Coalition for Epidemic Preparedness Innovations (CEPI), the Global Fund and Wellcome Trust. In the pape…