Chief Executive Officer (CEO) of the Bill & Melinda Gates Foundation, Mark Suzman, speaks during an interview with Reuters at the COP27 climate summit in Egypt's Red Sea resort of Sharm el-Sheikh, Egypt, November 7, 2022. REUTERS/Emilie Madi 

Chief Executive Officer (CEO) of the Bill & Melinda Gates Foundation, Mark Suzman, speaks during an interview with Reuters at the COP27 climate summit in Egypt's Red Sea resort of Sharm el-Sheikh, Egypt, November 7, 2022. REUTERS/Emilie Madi 

Chief Executive Officer (CEO) of the Bill & Melinda Gates Foundation, Mark Suzman, speaks during an interview with Reuters at the COP27 climate summit in Egypt's Red Sea resort of Sharm el-Sheikh, Egypt, November 7, 2022. REUTERS/Emilie Madi 

Chief Executive Officer (CEO) of the Bill & Melinda Gates Foundation, Mark Suzman, speaks during an interview with Reuters at the COP27 climate summit in Egypt's Red Sea resort of Sharm el-Sheikh, Egypt, November 7, 2022. REUTERS/Emilie Madi 

Former U.S. Secretary of State Hillary Clinton, Prof. Agnes Binagwaho Vice Chancellor of the University of Global Health Equity, and Melinda French Gates, Co-Chair of Bill & Melinda Gates Foundation and Founder of Pivotal Ventures, speak on a panel during the Clinton Global Initiative (CGI) meeting in Manhattan, New York City, U.S., September 19, 2022. REUTERS/David 'Dee' Delgado 

Melinda French Gates, Co-Chair of Bill & Melinda Gates Foundation and Founder of Pivotal Ventures, speaks during the Clinton Global Initiative (CGI) meeting in Manhattan, New York City, U.S., September 19, 2022. REUTERS/David 'Dee' Delgado 

Bill Gates, co-chairman of the Bill & Melinda Gates Foundation drinks a glass of water during a news conference at the World Economic Forum 2022 (WEF) in the Alpine resort of Davos, Switzerland May 25, 2022. REUTERS/Arnd Wiegmann 

Bill Gates, co-chairman of the Bill & Melinda Gates Foundation, attends a news conference at the World Economic Forum 2022 (WEF) in the Alpine resort of Davos, Switzerland May 25, 2022. REUTERS/Arnd Wiegmann 

U.S. climate envoy John Kerry and Bill Gates, co-chairman of the Bill & Melinda Gates Foundation, attend a news conference at the World Economic Forum 2022 (WEF) in the Alpine resort of Davos, Switzerland May 25, 2022. REUTERS/Arnd Wiegmann 

Bill Gates, co-chairman of the Bill & Melinda Gates Foundation, smiles after a news conference at the World Economic Forum 2022 (WEF) in the Alpine resort of Davos, Switzerland May 25, 2022. REUTERS/Arnd Wiegmann 

U.S. climate envoy John Kerry and Bill Gates, co-chairman of the Bill & Melinda Gates Foundation, attend a news conference at the World Economic Forum 2022 (WEF) in the Alpine resort of Davos, Switzerland May 25, 2022. REUTERS/Arnd Wiegmann 

Melinda Gates arrives on the red carpet for the annual White House Correspondents' Association Dinner in Washington, U.S., April 30, 2022. REUTERS/Tom Brenner 

Melinda Gates arrives on the red carpet for the annual White House Correspondents' Association Dinner in Washington, U.S., April 30, 2022. REUTERS/Tom Brenner 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, speaks during the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, speaks during the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attends the opening ceremony of the Generation Equality Forum at the Louvre Carrousel in Paris, France, June 30, 2021. REUTERS/Gonzalo Fuentes 

A pedestrian walks by a sign celebrating 20 years of The Bill & Melinda Gates Foundation, which was launched in 2000, at the foundation's Discovery Center in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

A sign commemorating 20 years of the Bill & Melinda Gates Foundation, which was launched in the year 2000, is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

A welcome plaque is pictured outside the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

The Bill & Melinda Gates Foundation is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

A pedestrian walks by the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

A person passes by on a scooter in front of the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

A pedestrian walks by the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

A pedestrian walks by the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

The Space Needle is reflected in the windows of the Bill & Melinda Gates Foundation in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

The Space Needle rises over the Bill & Melinda Gates Foundation campus in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

The Space Needle is reflected in a building at the Bill & Melinda Gates Foundation campus in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

The Bill & Melinda Gates Foundation campus is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

The Bill & Melinda Gates Foundation campus is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

The Bill & Melinda Gates Foundation campus is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

The Bill & Melinda Gates Foundation campus is pictured in Seattle, Washington, U.S. May 5, 2021. REUTERS/Lindsey Wasson 

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, attends a conversation at the 2019 New Economy Forum in Beijing, China November 21, 2019. REUTERS/Jason Lee 

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, attends a conversation at the 2019 New Economy Forum in Beijing, China November 21, 2019. REUTERS/Jason Lee 

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, attends a conversation at the 2019 New Economy Forum in Beijing, China November 21, 2019. REUTERS/Jason Lee 

U.S. Treasury Secretary Steven Mnuchin and philanthropist Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attend a meeting during the G7 finance ministers and central bank governors meeting in Chantilly, near Paris, France, July 18, 2019. REUTERS/Pascal Rossignol 

U.S. Treasury Secretary Steven Mnuchin, philanthropist Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, and World Bank President David Malpass attend a meeting during the G7 finance ministers and central bank governors meeting in Chantilly, near Paris, France, July 18, 2019. REUTERS/Pascal Rossignol 

U.S. Treasury Secretary Steven Mnuchin and philanthropist Melinda Gates, Co-Chair of the Bill and Melinda Gates Foundation, attend a meeting during the G7 finance ministers and central bank governors meeting in Chantilly, near Paris, France, July 18, 2019. REUTERS/Pascal Rossignol 

Susan Desmond-Hellmann, CEO of Bill & Melinda Gates Foundation, speaks at the 2019 Milken Institute Global Conference in Beverly Hills, California, U.S., April 29, 2019. REUTERS/Lucy Nicholson 

Melinda Gates speaks to Oprah Winfrey on stage during a taping of her TV show in the Manhattan borough of New York City, New York, U.S., February 5, 2019. REUTERS/Carlo Allegri 

Melinda Gates speaks to Oprah Winfrey on stage during a taping of her TV show in the Manhattan borough of New York City, New York, U.S., February 5, 2019. REUTERS/Carlo Allegri 

Melinda Gates speaks to Oprah Winfrey on stage during a taping of her TV show in the Manhattan borough of New York City, New York, U.S., February 5, 2019. REUTERS/Carlo Allegri 

Melinda Gates speaks to Oprah Winfrey on stage during a taping of her TV show in the Manhattan borough of New York City, New York, U.S., February 5, 2019. REUTERS/Carlo Allegri 

Melinda Gates speaks to Oprah Winfrey on stage during a taping of her TV show in the Manhattan borough of New York City, New York, U.S., February 5, 2019. REUTERS/Carlo Allegri 

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, attends the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann 

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, attends the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann 

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, attends the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann 

Bill Gates, Co-Chair of Bill & Melinda Gates Foundation, gestures as he speaks during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann 

Bill Gates, co-chair of the Bill & Melinda Gates Foundation, attends a news conference as the foundation teams up with the Japan Sports Agency and Tokyo 2020 to promote the Sustainable Development Goals in conjunction with the Olympics, in Tokyo, Japan, November 9, 2018. REUTERS/Toru Hanai 

Bill Gates, co-chair of the Bill & Melinda Gates Foundation, and Yoshiro Mori, president of the Tokyo 2020 Organising Committee, attend a news conference as the foundation teams up with the Japan Sports Agency and Tokyo 2020 to promote the Sustainable Development Goals in conjunction with the Olympics, in Tokyo, Japan, November 9, 2018. REUTERS/Toru Hanai 

Bill Gates, co-chair of the Bill & Melinda Gates Foundation, attends a news conference as the foundation teams up with the Japan Sports Agency and Tokyo 2020 to promote the Sustainable Development Goals in conjunction with the Olympics, in Tokyo, Japan, November 9, 2018. REUTERS/Toru Hanai 

Bill Gates, co-chair of the Bill & Melinda Gates Foundation, attends a news conference as the foundation teams up with the Japan Sports Agency and Tokyo 2020 to promote the Sustainable Development Goals in conjunction with the Olympics, in Tokyo, Japan, November 9, 2018. REUTERS/Toru Hanai