Customers wait for orders as Britain's Queen Elizabeth is seen during her address to the nation and the Commonwealth on a television amid an outbreak of the coronavirus disease (COVID-19), at Cafe 247 in Lucerne Valley, California, U.S., April 5, 2020. REUTERS/Shannon Stapleton

A sign is seen as a band plays amid an outbreak of the coronavirus disease (COVID-19), at Cafe 247 in Lucerne Valley, California, U.S., April 5, 2020. REUTERS/Shannon Stapleton

People embrace as a band plays amid an outbreak of the coronavirus disease (COVID-19), at Cafe 247 in Lucerne Valley, California, U.S., April 5, 2020. REUTERS/Shannon Stapleton

People drink beers as a band plays amid an outbreak of the coronavirus disease (COVID-19), at Cafe 247 in Lucerne Valley, California, U.S., April 5, 2020. REUTERS/Shannon Stapleton

People embrace as a band plays amid an outbreak of the coronavirus disease (COVID-19), at Cafe 247 in Lucerne Valley, California, U.S., April 5, 2020. REUTERS/Shannon Stapleton

People listen to a band play amid an outbreak of the coronavirus disease (COVID-19), at Cafe 247 in Lucerne Valley, California, U.S., April 5, 2020. REUTERS/Shannon Stapleton

People listen to a band play amid an outbreak of the coronavirus disease (COVID-19), at Cafe 247 in Lucerne Valley, California, U.S., April 5, 2020. REUTERS/Shannon Stapleton

People drink beers as a band plays amid an outbreak of the coronavirus disease (COVID-19), at Cafe 247 in Lucerne Valley, California, U.S., April 5, 2020. REUTERS/Shannon Stapleton

People wearing face masks hold hands as a band plays amid an outbreak of the coronavirus disease (COVID-19), at Cafe 247 in Lucerne Valley, California, U.S., April 5, 2020. REUTERS/Shannon Stapleton

The medievial Kapellbruecke bridge and the Wasserturm tower are seen in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

Pedal boats are seen during sunny spring weather at the dock of a boat rental on the banks of Lake Lucerne in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

Folding tables are seen during sunny spring weather on the terrace of a restaurant in front of the medievial Kapellbruecke bridge and the Wasserturm tower in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

Daniel Koch, Head of Communicable Diseases Division at the Federal Office of Public Health, listens to Swiss Interior Minister Alain Berset as he addresses a news conference after their visit to a drive-in test center for tests on coronavirus disease (COVID-19) in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

Swiss Interior Minister Alain Berset addresses a news conference, next to Daniel Koch, Head of Communicable Diseases Division at the Federal Office of Public Health, after their visit to a drive-in test center for tests on coronavirus disease (COVID-19) in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

A health worker takes a test from a person in a car at a drive-in test center for tests on coronavirus disease (COVID-19) in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

Health workers are seen at a drive-in test center for tests on coronavirus disease (COVID-19) in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

Health workers are seen at a drive-in test center for tests on coronavirus disease (COVID-19), next to the sign that reads: "Look ahead, don't turn head!", in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

A civil defence worker wears a protection mask as he checks the papers of a car driver before she can enter a drive-in test center for tests on coronavirus disease (COVID-19) in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

A health worker takes a test from a person in a car at a drive-in test center for tests on coronavirus disease (COVID-19) in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

A sign marks the entry of a drive-in test center for tests on coronavirus disease (COVID-19) in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

A civil defence worker wears a protection mask as he checks the papers of a car driver before he can enter a drive-in test center for tests on coronavirus disease (COVID-19), next to the sign that reads: "Only on advance notification. Close windows.", in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

A health worker takes a test from a person in a car at a drive-in test center for tests on coronavirus disease (COVID-19), next to the sign that reads: "Look ahead, don't turn head!", in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

A health worker takes a test from a person in a car at a drive-in test center for tests on coronavirus disease (COVID-19), next to the sign that reads: "Look ahead, don't turn head!", in Luzern, Switzerland March 31, 2020. REUTERS/Arnd Wiegmann

Civil defence workers wearing protection masks check the papers of a driver of a car before he can enter a drive-in test center for coronavirus disease (COVID-19) in Luzern, Switzerland March 27, 2020. The sign reads: "Only on advance notification. Close windows." REUTERS/Arnd Wiegmann

A health worker takes a test from a person in a car at a drive-in test center for coronavirus disease (COVID-19) in Luzern, Switzerland March 27, 2020. REUTERS/Arnd Wiegmann

A watch of Swiss manufacturer Swatch is displayed in the window of a Swatch shop in Luzern, Switzerland February 5, 2020. REUTERS/Arnd Wiegmann

Switzerland's national flag flies in front of the logo of Swiss bank Credit Suisse in Luzern, Switzerland February 5, 2020. REUTERS/Arnd Wiegmann

The logo of Swiss watch manufacturer Rolex is seen in Luzern, Switzerland February 5, 2020. REUTERS/Arnd Wiegmann

A general view shows Lake Lucerne and the city of Luzern, Switzerland February 5, 2020. REUTERS/Arnd Wiegmann

The medievial Kapellbruecke bridge, the Wasserturm tower and Mount Rigi are seen in Luzern, Switzerland February 5, 2020. REUTERS/Arnd Wiegmann

The medievial Kapellbruecke bridge, the Wasserturm tower and the old town are seen in Luzern, Switzerland February 5, 2020. REUTERS/Arnd Wiegmann

People look over Lake Lucerne from a terrace at the Buergenstock Hotels & Resort on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

The Palace Hotel is seen at Buergenstock Hotels & Resort on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

Buergenstock Hotels & Resort is seen on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

Buergenstock Hotels & Resort is seen on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

The logo of Buergenstock Hotels & Resort is seen on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

The logo of Swiss watch manufacturer Omega is seen at a shop at Buergenstock Hotels & Resort on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

The logo of Swiss watch manufacturer Omega is seen at a shop at Buergenstock Hotels & Resort on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

The logo of Swiss watch manufacturer Swatch is seen at a shop at Buergenstock Hotels & Resort on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

The logo of Swiss watch manufacturer Swatch is seen at a shop at Buergenstock Hotels & Resort on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

The logo of Swiss watch manufacturer Swatch is seen at a shop at Buergenstock Hotels & Resort on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

The logo of Swiss watch manufacturer Swatch is seen at a shop at Buergenstock Hotels & Resort on Buergenstock near Lucerne, Switzerland January 16, 2020. REUTERS/Arnd Wiegmann

A participant of a tour group of 4,000 Chinese takes pictures of the Chapel Bridge in the central Swiss city of Luzern, Switzerland May 13, 2019. REUTERS/Arnd Wiegmann

Participants of a tour group of 4,000 Chinese take pictures during their visit to the central Swiss city of Luzern, Switzerland May 13, 2019. REUTERS/Arnd Wiegmann

Participants of a tour group of 4,000 Chinese tourists walk over a bridge as Lake Lucerne and Mount Rigi are seen in the background during their visit to the central Swiss city of Luzern, Switzerland May 13, 2019. REUTERS/Arnd Wiegmann

Participants of a tour group of 4,000 Chinese tourists take pictures in front of the Chapel Bridge during their visit to the central Swiss city of Luzern, Switzerland May 13, 2019. REUTERS/Arnd Wiegmann

Participants of a tour group of 4,000 Chinese tourists take pictures in front of the Chapel Bridge during their visit to the central Swiss city of Luzern, Switzerland May 13, 2019. REUTERS/Arnd Wiegmann

Participants of a tour group of 4,000 Chinese tourists walk over a bridge during their visit to the central Swiss city of Luzern, Switzerland May 13, 2019. REUTERS/Arnd Wiegmann

The remaining archway of the historic railway station is seen in front of the modern central station in Luzern, Switzerland March 30, 2019. REUTERS/Arnd Wiegmann

The medievial Kapellbruecke bridge, the Wasserturm tower and the old town are seen in Luzern, Switzerland March 30, 2019. REUTERS/Arnd Wiegmann

Dr. Schmid's See Apotheke pharmacy is seen in Luzern, Switzerland March 30, 2019. REUTERS/Arnd Wiegmann

Hotel Chateau Guetsch is seen in Luzern, Switzerland March 30, 2019. REUTERS/Arnd Wiegmann

The medievial Kapellbruecke bridge, the Wasserturm tower and the old town are seen in Luzern, Switzerland March 30, 2019. REUTERS/Arnd Wiegmann

A combination picture shows the medieval Kapellbruecke bridge, the Wasserturm tower and the Jesuitenkirche church (back) before and during the Earth Hour in Luzern, Switzerland March 30, 2019. REUTERS/Arnd Wiegmann

The medieval Kapellbruecke bridge, the Wasserturm tower and the Jesuitenkirche church (back) are seen before the Earth Hour in Luzern, Switzerland March 30, 2019. REUTERS/Arnd Wiegmann

The medieval Kapellbruecke bridge, the Wasserturm tower and the Jesuitenkirche church (back) are seen during the Earth Hour in Luzern, Switzerland March 30, 2019. REUTERS/Arnd Wiegmann

Soccer Football - UEFA Nations League - League A - Group 2 - Switzerland v Belgium - Swissporarena, Lucerne, Switzerland - November 18, 2018 Belgium's Dedryck Boyata REUTERS/Arnd Wiegmann

Soccer Football - UEFA Nations League - League A - Group 2 - Switzerland v Belgium - Swissporarena, Lucerne, Switzerland - November 18, 2018 Belgium's Nacer Chadli REUTERS/Arnd Wiegmann

Soccer Football - UEFA Nations League - League A - Group 2 - Switzerland v Belgium - Swissporarena, Lucerne, Switzerland - November 18, 2018 Belgium's Dries Mertens REUTERS/Arnd Wiegmann

Soccer Football - UEFA Nations League - League A - Group 2 - Switzerland v Belgium - Swissporarena, Lucerne, Switzerland - November 18, 2018 Belgium's Toby Alderweireld REUTERS/Arnd Wiegmann