Microsoft Corp co-founder Bill Gates said Wednesday that he was stunned by the sheer volume of "crazy" and "evil" conspiracy theories circulating on social media during the COVID-19 pandemic, but said that he wanted to learn what is behind them.

In an interview with Reuters, Gates said the millions of online posts and "crazy conspiracy theories" about him and about top U.S. infectious disease expert Anthony Fauci had likely taken hold in part because of the combination of a frightening viral pandemic and the rise of social media.

"Nobody would have predicted that I and Dr. Fauci would be so prominent in these really evil theories," Gates said. "I'm very surprised by that. I hope it goes away."

Gates, a billionaire who stepped down as chairman of Microsoft Corp in 2014, has through his philanthropic Bill and Melinda Gates Foundation committed at least $1.75 billion to the global response to the COVID-19 pandemic.

That includes support for some makers of vaccines, diagnostics and potential treatments. Since the pandemic began a year ago, millions of conspiracies have spread over the Internet, fuelling misinformation about the coronavirus, its origins and the motives of those working to fight it.

They include claims that Fauci and Gates created the pandemic to try and control people, that they want to profit from the virus' spread, and that they want to use vaccines to insert trackable microchips into people. "But do people really believe that stuff?," Gates asked. "We're really going to have to get educated about this over the next year and understand.. how does it change peoples' behaviour and how should we have minimized this?"

Excited about Biden

Gates praised Fauci and Francis Collins, head of the U.S. National Institutes of Health, as "smart" and "wonderful people," and said he looked forward to seeing them able to work effectively and speak the truth under the new administration of President Joe Biden.

During former President Donald Trump's handling of the pandemic, Gates said, it had "sometimes felt like they were the only sane people in the U.S. government."

"I'm excited about the team that Biden has picked" to tackle the health crisis, Gates said. Gates said he was also pleased that under Biden, the United States has rejoined the World Health Organization (WHO), and "that he's appointed smart people, and the fact that Dr. Fauci won't be suppressed."