A sign for Sinovac Biotech Ltd is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A model of the BeiDou navigation satellites system is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A man holds a child as they look at a model of the BeiDou navigation satellites system at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

Snowboards are on display at a booth of winter equipment manufacturer Manlinski at the winter sports section of 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wear face masks at a booth of Dongxing Securities at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wearing face masks walk past a booth of the Export-Import Bank of China at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wear face masks at a booth of Beijing Rural Commercial Bank at the 2020 China International Fair for Trade in Services (CIFTIS),following the COVID-19 outbreak in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A staff member wearing a face mask works at a booth of China Export and Credit Insurance Corporation, known as Sinosure, at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

Staff members wearing face masks are seen at a booth of China Galaxy Securities at the 2020 China International Fair for Trade in Services (CIFTIS) in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wearing face masks walk past a booth of ICBC Credit Suisse Asset Management Co at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

The logo of Refinitiv is seen at its booth at the 2020 China International Fair for Trade in Services (CIFTIS) in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A screen shows a footage of Chinese President Xi Jinpingat the booth of the Beijing 2022 Olympic and Paralympic Winter Games, during 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wearing face masks walk near a booth of Yanqing competition area for the Beijing 2022 Olympic and Paralympic Winter Games, at the winter sports section of 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

Children wearing face masks skate at an ice rink by Eurojoy at the winter sports section of the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A child wearing a face mask attempts to touch artificial snow made by Eurojoy's snowmaker at the winter sports section of the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wearing face masks play curling at a booth for winter sports during the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wearing face masks following the COVID-19 outbreak walk past a billboard of the 2020 China International Fair for Trade in Services (CIFTIS) in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wearing face masks walk near a venue of the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A Chinese national flag flutters next to a venue for the 2020 China International Fair for Trade in Services (CIFTIS) in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wearing face masks walk past a venue of the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A staff member places a coronavirus vaccine candidate from Sinovac Biotech Ltd at its booth for display during the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

Security guards wearing face masks following the COVID-19 outbreak are seen at an entrance of a venue for the 2020 China International Fair for Trade in Services (CIFTIS) in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People wearing face masks take pictures of a booth displaying a coronavirus vaccine candidate from Sinovac Biotech Ltd, at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A booth displaying a coronavirus vaccine candidate from China National Biotech Group (CNBG) is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A staff member places a coronavirus vaccine candidate from Sinovac Biotech Ltd at its booth for display during the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A booth displaying a coronavirus vaccine candidate from Sinovac Biotech Ltd is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A booth displaying a coronavirus vaccine candidate from Sinovac Biotech Ltd is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A signage of Sinopharm is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A signage of Sinovac Biotech Ltd is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

A sign of Sinopharm is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 5, 2020. REUTERS/Tingshu Wang

People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A logo of German caravan maker Knaus Tabbert is seen on a disinfection station at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Signs are seen on the floor as people visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People watch the motorhome "Vario Perfect 1200 Platinum" of German motorhome maker Variomobil at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Caravans of German caravan maker Knaus Tabbert are seen at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Vintage caravans are seen at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A dog waits as a man watches a caravan at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A screen shows WHO Director-General Tedros Adhanom Ghebreyesus delivering a speech via video for the opening ceremony of the 2020 China International Fair for Trade in Services (CIFTIS), at a media centre in Beijing, China September 4, 2020. REUTERS/Tingshu Wang

A sign of the 2020 China International Fair for Trade in Services (CIFTIS) is seen behind a staff member while she is wearing a face mask following the coronavirus disease (COVDI-19) outbreak, at a media centre in Beijing, China September 4, 2020. REUTERS/Tingshu Wang

A screen is reflected in glass as it shows Chinese President Xi Jinping delivering a speech via video for the opening ceremony of the 2020 China International Fair for Trade in Services (CIFTIS), at a media centre in Beijing, China September 4, 2020. REUTERS/Tingshu Wang

A screen shows Chinese President Xi Jinping delivering a speech via video for the opening ceremony of the 2020 China International Fair for Trade in Services (CIFTIS), at a media centre in Beijing, China September 4, 2020. REUTERS/Tingshu Wang

Journalists sit next to a screen showing Chinese President Xi Jinping delivering a speech via video for the opening ceremony of the 2020 China International Fair for Trade in Services (CIFTIS), at a media centre in Beijing, China September 4, 2020. REUTERS/Tingshu Wang

A screen shows Chinese President Xi Jinping delivering a speech via video for the opening ceremony of the 2020 China International Fair for Trade in Services (CIFTIS), at a media centre in Beijing, China September 4, 2020. REUTERS/Tingshu Wang

A journalist sits next to a screen showing Chinese President Xi Jinping delivering a speech via video for the opening ceremony of the 2020 China International Fair for Trade in Services (CIFTIS), at a media centre in Beijing, China September 4, 2020. REUTERS/Tingshu Wang

Five-year-old model Henry poses in the motorhome Hobby Optima of German caravan and motorhome maker Hobby Wohnwagenwerk during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen TPX IMAGES OF THE DAY

A logo of German caravan maker Knaus Tabbert is seen at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Models present the full electric caravan "Cara Cito" of German caravan maker Weinsberg during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Models show how to split the interior area into two rooms in the van "First class - two rooms" of motorhome maker Malibu Vans during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A logo of German caravan maker Knaus Tabbert is seen on a protective face mask at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A model presents the full electric caravan "Cara Cito" of German caravan maker Weinsberg during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A model poses behind an electric fireplace in a luxury caravan of German caravan maker Fendt during a media event at the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A sign showing a hand desinfection order is seen at the entrance of the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, wich is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

People visit the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Visitors enter the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

Visitors queue at the entrance of the consumer trade fair "Caravan Salon" for caravans, motorhomes and camping, which is one of the first fairs that opens for visitors since the coronavirus disease (COVID-19) outbreak, in Dusseldorf, Germany, September 4, 2020. REUTERS/Thilo Schmuelgen

A booth displaying a coronavirus vaccine candidate from Sinovac Biotech Ltd is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 4, 2020. REUTERS/Tingshu Wang

A booth displaying a coronavirus vaccine candidate from Sinovac Biotech Ltd is seen at the 2020 China International Fair for Trade in Services (CIFTIS), following the COVID-19 outbreak, in Beijing, China September 4, 2020. REUTERS/Tingshu Wang