A vendor is seen inside a shop as portraits of Sun Yat-sen and the late Chinese chairman Mao Zedong hang on the wall at Panjiayuan flea market, following the novel coronavirus disease (COVID-19) outbreak, in Beijing, China May 19, 2020. REUTERS/Tingshu Wang

A visitor with a face mask poses for pictures near the portrait of Sun Yat-sen on Tiananmen Square on the first day of the five-day Labour Day holiday following the coronavirus disease (COVID-19) outbreak, in Beijing, China May 1, 2020. REUTERS/Tingshu Wang

People wearing face masks are seen under a statue of Chinese revolutionary pioneer Sun Yat-sen on a street in Wuhan, Hubei province, the epicenter of China's coronavirus disease (COVID-19) outbreak, April 1, 2020. REUTERS/Aly Song

People gather to watch the new year firework show at Sun Yat-Sen Memorial Hall in Taipei, Taiwan, January 1, 2020. REUTERS/Ann Wang

Member of a safety team established by police and local authorities inspects around a statue of Dr Sun Yat-sen, as they assess and clear unsafe items at the Hong Kong Polytechnic University (PolyU) in Hong Kong, China November 28, 2019. REUTERS/Leah Millis TPX IMAGES OF THE DAY

A view of a statue of Dr Sun Yat-sen inside Hong Kong Polytechnic University (PolyU) campus, in Hong Kong, China November 19, 2019. REUTERS/Adnan Abidi

People take pictures in front of a portrait of Chinese revolutionary pioneer Sun Yat-sen in Tiananmen Square one day before a parade marking the 70th anniversary of the founding of the People's Republic of China in Beijing, China September 30, 2019. REUTERS/Thomas Peter

A woman dressed in traditional clothes stands in front of Sun Yat-sen Memorial hall in Xinji district in Guanghzou, China, September 7, 2019. REUTERS/Jorge Silva SEARCH "GUANGZHOU ANNIVERSARY" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Terry Gou, founder and chairman of Foxconn, salutes to a portrait of Sun Yat-sen, the founding father of Taiwan, as he announces seeking the nomination of Taiwan's opposition Kuomintang to run for the island's presidency, in Taipei, Taiwan April 17, 2019. REUTERS/Tyrone Siu

Terry Gou, founder and chairman of Foxconn, salutes to a portrait of Sun Yat-sen, the founding father of Taiwan, as he announces seeking the nomination of Taiwan's opposition Kuomintang to run for the island's presidency, in Taipei, Taiwan April 17, 2019. REUTERS/Tyrone Siu

Terry Gou, founder and chairman of Foxconn, holds a testimonial next to a portrait of Sun Yat-sen, the founding father of Taiwan, as he announces seeking the nomination of Taiwan's opposition Kuomintang party to run for the island's presidency, in Taipei, Taiwan, April 17, 2019. REUTERS/Tyrone Siu

Terry Gou, founder and chairman of Foxconn, holds a testimonial next to a portrait of Sun Yat-sen, the founding father of Taiwan, as he announces seeking the nomination of Taiwan's opposition Kuomintang party to run for the island's presidency, in Taipei, Taiwan, April 17, 2019. REUTERS/Tyrone Siu

Students visit the Dr Sun Yat-sen Museum at the Western district in Hong Kong, China November 6, 2018. Picture taken November 6, 2018. REUTERS/Bobby Yip

A statue of Sun Yat-sen, father of modern China, is displayed outside the Dr Sun Yat-sen Museum at the Western district in Hong Kong, China November 6, 2018. Picture taken November 6, 2018. REUTERS/Bobby Yip

A picture of Sun Yat-sen, widely recognized as the father of modern China is displayed at a former military fort, ahead of the 60th anniversary of Second Taiwan Straits Crisis against China, in Kinmen, Taiwan August 19, 2018. REUTERS/Tyrone Siu

A statue of Sun Yat-sen, regarded as the father of modern China, is displayed at a memorial park in Zhongshan, China, where he was born, June 28, 2018. Picture taken June 28, 2018. REUTERS/Bobby Yip

Taiwanese President Tsai Ing-wen speaks in front of a portrait of Sun Yat-sen, the founding father of Taiwan, during joint military academies graduation ceremony in Taipei, Taiwan June 29, 2018. REUTERS/Tyrone Siu

China's Politburo Standing Committee member Wang Huning attends a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. Picture taken November 11, 2016. REUTERS/Jason Lee

China's Politburo Standing Committee member Sun Chunlan attends a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. Picture taken November 11, 2016. REUTERS/Jason Lee

China's Politburo Standing Committee member Sun Chunlan attends a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. Picture taken November 11, 2016. REUTERS/Jason Lee

China's Vice President Li Yuanchao attends a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. Picture taken November 11, 2016. REUTERS/Jason Lee

Delegates attend a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping (L) and Premier Li Keqiang arrive to attend a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping arrives to attend a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping delivers a speech at a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping arrives to attend a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping (C) leaves after a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping (L) shakes hands with former Hong Kong chief executive Tung Chee-hwa after a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

An attendant checks seats after a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee TPX IMAGES OF THE DAY

China's President Xi Jinping delivers a speech at a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping delivers a speech at a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping delivers a speech at a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping delivers a speech at a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

China's President Xi Jinping delivers a speech at a conference commemorating the 150th birth anniversary of Sun Yat-Sen, widely recognised as the father of modern China, at the Great Hall of the People in Beijing, China, November 11, 2016. REUTERS/Jason Lee

Professor Zhiyong Xi (R) talks in a car travelling on a bridge that leads to Shazai Island, which has a field studio of Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A villager undertakes a health research project on Shazai Island which has with a field studio of Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A field studio of Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A view of a village on Shazai Island which has a field studio of Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Professor Zhiyong Xi looks on at a "sex separation area" inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A general view of Shazai Island which has a field studio of Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A researcher carries empty containers after releasing male mosquitos on Shazai Island, which has a field studio of Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Researchers release male mosquitos on Shazai Island which has a field studio of Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A researcher releases male mosquitos on Shazai Island which has a field studio of Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A lab technician works at the "microinjection area" inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Lab technicians prepare to go into the "Mass production, research and development area" inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A room containing mosquito specimen is seen inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Mosquitos are bred in cages inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Trays containing mosquito larvae are seen inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

An introduction to the aedes mosquito is displayed inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Lab technicians work at a "sex separation area" inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Electric swatters are seen inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Female mosquito larvae (top) are separated from maie ones (bottom) at a "sex separation area" inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A lab technician cleans the floor of an area with trays containing mosquito larvae inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A young visitor chats with a lab technician inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Lab technicians work at a "sex separation area" inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

A lab technician kills mosquitos with an electric swatter inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Mosquito larvae are seen at a "sex separation area" inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Mosquito samples collected from different areas of Shazai Island for further studies are seen at a field studio of Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip

Mosquitos are bred inside Sun Yat-Sen University-Michigan State University Joint Center of Vector Control for Tropical Disease, the world’s largest "mosquito factory" which breeds millions of bacteria-infected mosquitoes, in the fight against the spread of viruses such as dengue and Zika, in Guangzhou, China July 28, 2016. Picture taken July 28, 2016. REUTERS/Bobby Yip TPX IMAGES OF THE DAY

Taiwanese national flag and a portrait of the founding father of the Republic of China, Sun Yat-sen, at the Legislative Yuan Taipei, Taiwan May 17, 2016. REUTERS/Tyrone Siu