A mother and her child wearing masks to prevent contacting the coronavirus, shop at a traditional market in Seoul, South Korea, February 24, 2020.

Tourists wearing masks to prevent the coronavirus walk on the street in downtown Seoul, South Korea, February 24, 2020.

A ground staff member of Vietnam Airlines and passengers wearing protective mask, following an outbreak of the novel coronavirus, wait for boarding at the Danang airport in Danang city, Vietnam February 23, 2020. Image for illustrative purposes. Image used for illustrative purpose .

A couple wearing masks to prevent contracting the coronavirus, looks on at an employee (not pictured) from a disinfection service company sanitizing the floor of a traditional market in Seoul, South Korea, February 24, 2020.

People wearing masks to prevent the coronavirus walk on a pedestrian crossing in downtown Seoul, South Korea, February 24, 2020.

Tourists wearing masks to prevent the coronavirus take a selfie at a shopping district in Seoul, South Korea, February 24, 2020.

A shopkeeper wearing a mask to prevent contracting the coronavirus waits for a customer at a traditional market in Seoul, South Korea, February 24, 2020.

People wearing face masks are seen at the central railway station, after a coronavirus outbreak, in Milan, Italy February 24, 2020.

A member of the medical team sprays disinfectant to sanitize the area near a religious school where the first coronavirus case was detected, following the outbreak of the new?coronavirus, in the holy city of Najaf, Iraq February 24, 2020.

People wearing protective masks are seen at the Shibuya sky observation deck, following an outbreak of the coronavirus in Tokyo, Japan, February 24, 2020.

A member of medical staff is seen at a quarantine room of a hospital, following the outbreak of the new coronavirus, in the holy city of Najaf, Iraq February 24, 2020.

Iraqi children wear protective masks as they walk near a religious school where the first coronavirus case was detected, following the outbreak of the new coronavirus, in the holy city of Najaf, Iraq February 24, 2020.

A man wearing a face mask drives past members of the Guardia di Finanza, amid a coronavirus outbreak in northern Italy, in Casalpusterlengo, Italy, February 24, 2020.

Christian faithful wearing masks to prevent contacting coronavirus pray during a service in Seoul, South Korea, February 23, 2020.

People queue at a supermarket outside the town of Casalpusterlengo, which has been closed by the Italian government due to a coronavirus outbreak in northern Italy, February 23, 2020.

People queue at a supermarket outside the town of Casalpusterlengo, which has been closed by the Italian government due to a coronavirus outbreak, Italy, February 23, 2020.

Image used for illustrative purpose. People wear protective masks at Venice Carnival, which the last two days of, as well as Sunday night's festivities, have been cancelled because of an outbreak of coronavirus, in Venice, Italy February 23, 2020. REUTERS/Ohad Zwigenberg

People wearing face masks are seen inside a supermarket in the town of Casalpusterlengo, which has been closed by the Italian government due to a coronavirus outbreak in northern Italy, February 23, 2020.

A worker holds a face mask outside the theatre where the Italian designer Giorgio Armani said his Milan Fashion Week show would take place to safeguard the health of press and buyers after a coronavirus outbreak in northern Italy, in Milan, Italy, February 23, 2020.

A woman is taken into an ambulance amid a coronavirus outbreak in northern Italy, in Casalpusterlengo, February 22, 2020.

Empty shelves are seen at a supermarket, after a coronavirus outbreak, in Milan, Italy February 24, 2020.

A man wearing a mask to prevent contracting the coronavirus walks past a branch of the Shincheonji Church of Jesus the Temple of the Tabernacle of the Testimony in Daegu, South Korea February 21, 2020.

Iraqi demonstrators wear protective face masks, following the outbreak of the new coronavirus, during ongoing anti-government protests in Najaf, Iraq February 24, 2020.

People wearing protective masks are seen at the Shibuya shopping district, following an outbreak of the coronavirus in Tokyo, Japan, February 24, 2020.

Ukraine's Health Minister Zoriana Skaletska wears a protective suit and a mask while speaking with evacuees from coronavirus-hit China's Hubei province at a sanatorium in the village of Novi Sanzhary in Poltava region, Ukraine, in this picture obtained from social media February 24, 2020. FACEBOOK/Ukraine's Health Minister Zoriana Skaletska via REUTERS

A man stands outside the San Siro stadium after the Inter Milan v Sampdoria Serie A match was cancelled due to an outbreak of the coronavirus in Lombardy and Veneto, in Milan, Italy, February 23, 2020.

A police officer wearing a protective face mask stands next to a masked carnival reveller at Venice Carnival, which the last two days of, as well as Sunday night's festivities, have been cancelled because of an outbreak of coronavirus, in Venice, Italy February 23, 2020.

Carabinieri officers patrol outside the town of Castiglione D'Adda, which has been closed by the Italian government due to a coronavirus outbreak, Italy, February 23, 2020.

A woman reads a newspaper outside Duomo cathedral, closed by authorities due to a coronavirus outbreak, in Milan, Italy February 24, 2020.

A street vendor sells face masks outside the central railway station, after a coronavirus outbreak, in Milan, Italy February 24, 2020.

A woman wearing a mask to prevent contacting the coronavirus sits in front of a closed shop at a traditional market in Seoul, South Korea, February 24, 2020.

Bruce Aylward of the World Health Organisation (WHO) attends a news conference of the WHO-China Joint Mission on Covid-19 about its investigation of the coronavirus outbreak in Beijing, China, February 24, 2020.

Ambulances transporting confirmed coronavirus patients arrive at a hospital in Daegu, South Korea, February 23, 2020. Yonhap via REUTERS

A policewoman wearing a protective mask stands next to carnival revellers at Venice Carnival, which the last two days of, as well as Sunday night's festivities, have been cancelled because of an outbreak of coronavirus, in Venice, Italy February 23, 2020. REUTERS/Ohad Zwigenberg

Brazilian citizens who were repatriated from China's coronavirus-struck Wuhan, are seen after their quarantine period ended in Air Force base of Anapolis, State of Goias, Brazil February 23, 2020.

Image used for illustrative purpose. A worker wearing a face mask is pictured at a supermarket. February 23, 2020.