Thousands of people lined up for coronavirus tests in a province near Bangkok on Sunday, as Thai authorities scrambled to contain an outbreak of the virus that has infected nearly 700 people.

Triple lines of mainly migrant workers stretched for around 100 meters in one location alone, at Mahachai in Samut Sakhon province, as health officials in mobile units methodically took nasal swabs. There were three locations in total in the area.

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People stand in lines to get COVID-19 tests in Samut Sakhon, South of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP PhotoJerry Harmer)

Thousands of people lined up for coronavirus tests in a province near Bangkok on Sunday, as Thai authorities scrambled to contain an outbreak of the virus that has infected nearly 700 people.

Health workers in protective clothing conduct screening for COVID-19 in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP PhotoJerry Harmer)

Thailand’s Disease Control Department said Sunday that they found 141 more cases linked to the market outbreak. On Saturday, the department reported 548 cases, Thailand's biggest daily spike, sending shockwaves through a country that has seen only a small number of infections over the past several months due to strict border and quarantine controls.

A group of migrant workers arrive in a back of a truck to get screened for COVID-19 in Samut Sakhon, South of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)

Samut Sakhon is 34 kilometers (21 miles) southwest of Bangkok, the capital.

A guard with a face-shield stands near a shrimp market in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. Health officials said the new cases are mostly migrant workers from Myanmar connected to the outbreak at the Klang Koong shrimp market in Samut Sakhon province. (AP Photo Jerry Harmer)

For some, the concern was economic.

A health worker in protective clothing collects nasal swab sample from a man to test for COVID-19 in Samut Sakhon, South of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)

“How can I live like this? The virus comes but I can’t see it. If something happens to me, it will be messy,” Wanida said before walking away.

Health workers record migrant workers ahead of collecting nasal swab samples from them to test for COVID-19 in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand on Sunday reported a few new local infections, a day after identifying more than 500 cases south of Bangkok in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)

Health workers record migrant workers ahead of collecting nasal swab samples from them to test for COVID-19 in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand on Sunday reported a few new local infections, a day after identifying more than 500 cases south of Bangkok in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)

Nearby, razor wire and police guards blocked access to the Klang Koong, or Central Shrimp, seafood market — one of Thailand's largest — and its associated housing, the epicenter of the new cluster.

People stand in lines to get COVID-19 tests in Samut Sakhon, South of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP PhotoJerry Harmer)

People stand in lines to get COVID-19 tests in Samut Sakhon, South of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP PhotoJerry Harmer)

Thailand’s Disease Control Department said Sunday that they found 141 more cases linked to the market outbreak. On Saturday, the department reported 548 cases, Thailand's biggest daily spike, sending shockwaves through a country that has seen only a small number of infections over the past several months due to strict border and quarantine controls.

The new outbreak has been traced to a 67-year-old shrimp vendor at the seafood market.

Health officials say most of those who have been infected are migrant workers from Myanmar. The workers live close to the market in crowded accommodations, raising fears that the virus could spread exponentially.

Health workers in protective clothing conduct screening for COVID-19 in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP PhotoJerry Harmer)

Health workers in protective clothing conduct screening for COVID-19 in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP PhotoJerry Harmer)

Samut Sakhon is 34 kilometers (21 miles) southwest of Bangkok, the capital.

Samut Sakhon's governor has imposed a night curfew and other travel restrictions until Jan. 3. Many public places in the province, including shopping malls, schools, cinemas, spas and sports stadiums, have been ordered closed.

At the Mahachai seafood market, there was a listless atmosphere as idle workers sat around, unable to leave the area. Food supplies were brought to the entrance but had to be offloaded. Masked residents of the housing around the market piled provisions onto trolleys and took them away.

A group of migrant workers arrive in a back of a truck to get screened for COVID-19 in Samut Sakhon, South of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)

A group of migrant workers arrive in a back of a truck to get screened for COVID-19 in Samut Sakhon, South of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)

For some, the concern was economic.

“I am worried because I can’t do anything at all and my employees can’t go out either, so we can’t do anything. The loss is huge,” said one seafood merchant, 55-year-old Thanawan Watchanapraphan.

Wanida Imphanchai, another merchant, paced near the market's blocked entrance, telling the police on duty that she had a negative coronavirus test just days ago and should be allowed to leave. She showed them the document on her phone, but they politely declined her request.

A guard with a face-shield stands near a shrimp market in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. Health officials said the new cases are mostly migrant workers from Myanmar connected to the outbreak at the Klang Koong shrimp market in Samut Sakhon province. (AP Photo Jerry Harmer)

A guard with a face-shield stands near a shrimp market in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. Health officials said the new cases are mostly migrant workers from Myanmar connected to the outbreak at the Klang Koong shrimp market in Samut Sakhon province. (AP Photo Jerry Harmer)

“How can I live like this? The virus comes but I can’t see it. If something happens to me, it will be messy,” Wanida said before walking away.

With fewer than 5,000 cases and 60 deaths, Thailand has been able to largely control the virus. Prior to the current outbreak, there had been very few cases of local transmission in recent months, as life returned largely back to normal.

A health worker in protective clothing collects nasal swab sample from a man to test for COVID-19 in Samut Sakhon, South of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)

A health worker in protective clothing collects nasal swab sample from a man to test for COVID-19 in Samut Sakhon, South of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand reported more than 500 new coronavirus cases on Saturday, the highest daily tally in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)

Health workers record migrant workers ahead of collecting nasal swab samples from them to test for COVID-19 in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand on Sunday reported a few new local infections, a day after identifying more than 500 cases south of Bangkok in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)

Health workers record migrant workers ahead of collecting nasal swab samples from them to test for COVID-19 in Samut Sakhon, south of Bangkok, Thailand, Sunday, Dec. 20, 2020. Thailand on Sunday reported a few new local infections, a day after identifying more than 500 cases south of Bangkok in a country that had largely brought the pandemic under control. (AP Photo Chalida Ekvitthayavechnukul)