What is the most lethal epidemic in recent years?

The most lethal epidemic in recent years has been the Ebola outbreak that began in West Africa in 2014, resulting in over 11,000 deaths. While the COVID-19 pandemic, which emerged in late 2019, has caused a higher number of infections and deaths globally, Ebola's fatality rate can reach up to 90% in certain outbreaks, making it particularly deadly. Other significant epidemics include the Zika virus outbreak and the resurgence of measles in some regions, but none have matched the lethality of Ebola in terms of mortality rate.