Since the start of the pandemic, there have been internet conspiracy theories that coronavirus originated in Wuhan in China’s top biosafety laboratory, which also specialises in bat-related viruses. The leading theory among scientists remains that the virus spread to humans from bat-infected animals in Wuhan’s wildlife market.
The conspiracy theory has been given greater credence by the US President who has challenged China on several occasions and suggested he may claim damages over the outbreak.. Yesterday, The US intelligence community has concluded that coronavirus was not man-made or genetically modified or engineered. Yesterday, the US President yesterday appeared to undercut his own intelligence agencies by suggesting he has seen evidence coronavirus originated in a Chinese laboratory. https://www.bbc.co.uk/news/world-us-canada-52496098
“The Intelligence Community will continue to rigorously examine emerging information and intelligence to determine whether the outbreak began through contact with infected animals or if it was the result of an accident at a laboratory in Wuhan.”
Spanish Flu 1918

The Spanish influenza pandemic was one of the greatest disasters of the 20th Century. Over 500 million people were infected and up to 50 million people died. It was nicknamed ‘Spanish flu’ as the first reported cases were in Spain.
However, contrary to its name, the outbreak originated in America on the Kansas prairies, where dirt-poor farm families struggled to do daily chores — slopping pigs, feeding cattle, horses, and chickens, living in primitive, cramped, uninsulated quarters.https://www.kansas.com/news/local/article200880539.html
While the pandemic lasted for two years, a significant number of deaths were packed into three especially cruel months in the autumn of 1918. Historians now believe that the fatal severity of the Spanish flu’s “second wave” was caused by a mutated virus spread by wartime troop movements.
Although China was affected by the second wave, the extend of deaths it is not known. https://www.history.com/news/spanish-flu-second-wave-resurgence