Posters offering special discount on Black Friday sales are seen in front of an Essentiel Antwerp fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Special discount on Black Friday sales is offered at a fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

A poster offering special discount on Black Friday sales is seen in front of an Essentiel Antwerp fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Posters offering special discount on Black Friday sales are seen in front of an Essentiel Antwerp fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Posters offering special discount on Black Friday sales are seen in front of a United Colors of Benetton kid's fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Posters offering special discount on Black Friday sales are seen in front of a United Colors of Benetton kid's fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Special discount on Black Friday sales is offered at a Triumph lingerie store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Shoppers walk past a poster offering special discount on Black Friday sales at a United Colors of Benetton store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

A sign offering special discount on Black Friday sales is seen at a Navyboot shoe store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Special police forces clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Special police forces clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

A special police officer approaches an activist in the treetops at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Special police forces approach activists in treetops at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Special police forces approach activists in treetops at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Special police forces clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Special police forces clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Special police forces clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Special police forces clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

A special police officer tries to clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

A special police officer tries to clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

A special police officer is equipped to clear tree houses at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Special police forces clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Special police forces clear a tree house at the Dannenrod forest, during a protest of environmentalists against the extension of the A49 motorway, near Dannenrod, Germany, November 27, 2020. REUTERS/Kai Pfaffenbach

Cadets of the Special Military School of Saint-Cyr stand in front of the French-flag-draped coffin of late Daniel Cordier, Jean Moulin's secretary, former French resistance member, and veteran with the medaille des Compagnons de la Liberation (Order of the Liberation Companion), during a national ceremony to pay tribute to him, at the Hotel National des Invalides in Paris, France, November 26, 2020. REUTERS/Gonzalo Fuentes

Cadets of the Special Military School of Saint-Cyr carry the French-flag-draped coffin of late Daniel Cordier, Jean Moulin's secretary, former French resistance member, and veteran with the medaille des Compagnons de la Liberation (Order of the Liberation Companion), during a national ceremony to pay tribute to him, at the Hotel National des Invalides in Paris, France, November 26, 2020. REUTERS/Gonzalo Fuentes

A cold room under construction that is specially prepared for the cooling of medicines and vaccines is seen, as Air France-KLM's cargo operations are preparing a massive logistical operation carrying new vaccines and vaccine candidates for COVID-19 through Amsterdam's Schiphol Airport, Netherlands November 25, 2020. Picture taken November 25, 2020. REUTERS/Piroschka van de Wouw

A man pulls the door of a bar in Hong Kong's Lan Kwai Fong after bars, nightclubs and other entertainment venues were closed in response to a renewed rise in coronavirus disease (COVID-19) cases, China November 26, 2020. REUTERS/Lam Yik

A staff pulls down the bar front shutters in Hong Kong's Lan Kwai Fong after bars, nightclubs and other entertainment venues were closed in response to a renewed rise in coronavirus disease (COVID-19) cases, China November 26, 2020. REUTERS/Lam Yik

A staff cleans outside a bar in Hong Kong's Lan Kwai Fong after bars, nightclubs and other entertainment venues were closed in response to a renewed rise in coronavirus disease (COVID-19) cases, China November 26, 2020. REUTERS/Lam Yik

A man passes by a closed bar in Hong Kong's Lan Kwai Fong after bars, nightclubs and other entertainment venues were closed in response to a renewed rise in coronavirus disease (COVID-19) cases, China November 26, 2020. REUTERS/Lam Yik

A bartender prepares a drink at a bar in Hong Kong's Lan Kwai Fong before bars, nightclubs and other entertainment venues are set to close at midnight in response to a renewed rise in coronavirus disease (COVID-19) cases, China November 25, 2020. REUTERS/Lam Yik

People drink at a bar in Hong Kong's Lan Kwai Fong before bars, nightclubs and other entertainment venues are set to close at midnight in response to a renewed rise in coronavirus disease (COVID-19) cases, in Hong Kong, China November 25, 2020. REUTERS/Lam Yik

People drink at a bar in Hong Kong's Lan Kwai Fong before bars, nightclubs and other entertainment venues are set to close at midnight in response to a renewed rise in coronavirus disease (COVID-19) cases, in Hong Kong, China November 25, 2020. REUTERS/Lam Yik

People drink at a bar in Hong Kong's Lan Kwai Fong before bars, nightclubs and other entertainment venues are set to close at midnight in response to a renewed rise in coronavirus disease (COVID-19) cases, in Hong Kong, China November 25, 2020. REUTERS/Lam Yik

People drink at a bar in Hong Kong's Lan Kwai Fong before bars, nightclubs and other entertainment venues are set to close at midnight in response to a renewed rise in coronavirus disease (COVID-19) cases, in Hong Kong, China November 25, 2020. REUTERS/Lam Yik

The home of the Weiser family is where their two high school students attend virtual classes after their school canceled in-person learning due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

Ralston Valley High School in Arvada, Colorado, is seen closed to in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

Ralston Valley High School in Arvada, Colorado, is seen closed to in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

Ralston Valley High School in Arvada, Colorado, is seen closed to in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

Ralston Valley High School in Arvada, Colorado, is seen closed to in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

The home of the Weiser family is where their two high school students attend virtual classes after their school canceled in-person learning due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

People play on the football field outside Ralston Valley High School in Arvada, Colorado, which canceled in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

Ralston Valley High School in Arvada, Colorado, is seen closed to in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

Ralston Valley High School in Arvada, Colorado, is seen closed to in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

Ralston Valley High School in Arvada, Colorado, is seen closed to in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

Ralston Valley High School in Arvada, Colorado, is seen closed to in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school junior Xander Weiser studies from his home after his school canceled in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school junior Xander Weiser studies from his home after his school canceled in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school freshman Maddie Weiser poses for a portrait at her home where she attends classes remotely since her school was closed due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school junior Xander Weiser studies from his home after his school canceled in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school junior Xander Weiser studies from his home after his school canceled in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school junior Xander Weiser studies from his home after his school canceled in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school junior Xander Weiser studies from his home after his school canceled in-person classes due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school freshman Maddie Weiser poses for a portrait at her home where she attends classes remotely since her school was closed due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school freshman Maddie Weiser poses for a portrait at her home where she attends classes remotely since her school was closed due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

5th grade student Junior Romero, 10, studies in a classroom with plastic partitions at Louise Elementary School, during the coronavirus disease (COVID-19) pandemic in Louise, Texas, U.S., November 20, 2020. Picture taken November 20, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Go Nakamura

High school freshman, Maddie Weiser, studies from her home after her school was closed due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school freshman, Maddie Weiser, studies from her home after her school was closed due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt

High school freshman, Maddie Weiser, studies from her home after her school was closed due to the continuing coronavirus disease (COVID-19) pandemic in Jefferson County School District outside Denver, Colorado, U.S., November 19, 2020. Picture taken November 19, 2020. To match Special Report: HEALTH-CORONAVIRUS/SCHOOLS-REOPENING. REUTERS/Kevin Mohatt