If asked, many American could easily cite several dangerous global outbreaks from the past two decades: SARS in 2004, H1N1 in 2009, and the Ebola outbreak in 2015.
Every 5-6 years. Next one is in 2025-6 
the 2009 H1N1 flu outbreak, which killed more than 12,000 Americans
So far,
Meanwhile, the number of deaths in Singapore has shot up to 6! The new strains from Europe and USA are more lethal than the original strain (no death arising from this strain). Now I am worry about the coronavirus continues to mutate into progressively more lethal strain so we have to beware of the 3rd wave coming from different epicenter (likely to be from Southern Hemisphere).