Total global spending on COVID-19 vaccines is projected to reach $157 billion by 2025, driven by mass vaccination programs underway and “booster shots” expected every two years, according to a report by U.S. health data company IQVIA Holdings (NYSE: IQV) Inc released on Thursday. Reuters reports that the company, which provides data and analytics for the healthcare industry, said it expects the first wave of COVID-19 vaccinations to reach about 70% of the world’s population by the end of 2022. Booster shots are likely to follow initial vaccinations every two years, the report said, based on current data on the duration of effect of the vaccines.