Peter Ben Embarek and Peter Daszak, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), pose for pictures at a hotel in Wuhan, Hubei province, China February 10, 2021. REUTERS/Aly Song 

Peter Daszak, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), waves as he leaves a hotel in Wuhan, Hubei province, China February 10, 2021. REUTERS/Aly Song 

Peter Ben Embarek, Peter Daszak and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), pose for pictures at a hotel in Wuhan, Hubei province, China February 10, 2021. REUTERS/Aly Song 

Peter Daszak, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), leaves a hotel with a chart of the Huanan seafood market, in Wuhan, Hubei province, China February 10, 2021. REUTERS/Aly Song 

Marion Koopmans and Peter Daszak, members of the World Health Organisation (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), leave from their hotel to the airport, in Wuhan, Hubei province, China February 10, 2021. REUTERS/Aly Song REFILE - QUALITY REPEAT 

Peter Daszak, a member of the World Health Organisation (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19) gestures as he leaves from his hotel to the airport, in Wuhan, Hubei province, China February 10, 2021. REUTERS/Aly Song REFILE - QUALITY REPEAT 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), speaks at the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), leaves at the end of the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), shakes hands with Liang Wannian, head of expert panel on COVID-19 response at China's National Health Commission, at the end of the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), shakes hands with Liang Wannian, head of expert panel on COVID-19 response at China's National Health Commission, next to Marion Koopmans at the end of the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), leave at the end of the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), leave at the end of the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), leaves at the end of the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), leaves at the end of the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Marion Koopmans, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), speaks at the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), and Liang Wannian, head of expert panel on COVID-19 response at China's National Health Commission, attend the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attend the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Journalists attend the WHO-China joint study news conference on the study of origins of the coronavirus disease (COVID-19), at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attend the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), speaks at the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), holds a chart during the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Marion Koopmans, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attend the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), holds a chart during the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), speaks at the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), holds a chart during the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Liang Wannian, head of expert panel on COVID-19 response at China's National Health Commission, attends the WHO-China joint study news conference on the study of origins of the coronavirus disease (COVID-19), at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attend the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attend the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Marion Koopmans, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), arrive for the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attends the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

(R-L) Marion Koopmans and Peter Ben Embarek, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), Liang Wannian, head of expert panel on COVID-19 response at China's National Health Commission, and Chinese National Health Commission spokesman Mi Feng attend the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), attend the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Peter Ben Embarek and Marion Koopmans, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), arrive for the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

(R-L) Marion Koopmans and Peter Ben Embarek, members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), Liang Wannian, head of expert panel on COVID-19 response at China's National Health Commission, and Chinese National Health Commission spokesman Mi Feng arrive for the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Thea Fischer, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), arrives before the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Thea Fischer, a member of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), arrives before the WHO-China joint study news conference at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Security members keep watch outside the venue where members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19) are expected to hold a news conference, at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Police officers ride motorcycles outside the venue where members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19) are expected to hold a news conference, at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

Security members keep watch outside the venue where members of the World Health Organization (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19) are expected to hold a news conference, at a hotel in Wuhan, Hubei province, China February 9, 2021. REUTERS/Aly Song 

A girl wearing a face mask walks on a street decorated for Lunar New Year celebrations, following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song 

A boy wearing a face mask plays badminton at a street decorated for Lunar New Year celebrations, following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song TPX IMAGES OF THE DAY 

People wearing face masks wait to buy food at a street market, following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song 

People wearing face masks walk on a street market, following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song 

People wearing face masks buy lotus roots at a wet market, following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song 

People wearing face masks walk on a street market, following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song 

People wearing face masks wait to buy food from a steamed food stall at a street market, following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song 

People wearing face masks buy vegetables at a wet market, following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song 

A woman wearing a face mask rides a bicycle with a child, following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song TPX IMAGES OF THE DAY 

A main street is seen decorated for Lunar New Year celebrations following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song 

A main street is seen decorated for Lunar New Year celebrations following an outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song 

Dominic Dwyer, a member of the World Health Organisation (WHO) team tasked with investigating the origins of the coronavirus disease (COVID-19), stands on the balcony of a hotel in Wuhan, Hubei province, China February 8, 2021. REUTERS/Aly Song