Gu Yanan looked at Nan Hanfei on the left, and then looked at Gu Qingcen on the right.

Obviously, both of them want to help, but how do they smell gunpowder?

At this moment, Gu Jiashu appeared and shouted to Gu Yanan: "Little sister, there are a few new food poisoning patients, don't leave all of you disease control and leave one behind." ”

Nan Hanfei is not from disease control, Gu Yanan has to go to the eastern suburbs farm in person, and only Gu Qingcen can use it.

"Brother Qingcen, you stay."

Gu Yanan spoke, and a trace of helplessness flashed on Gu Qingcen's face, but in the end, he nodded and followed Gu Yanan's meaning, "Okay, you guys be careful on the road, call me in time if there is anything." ”

——

At night, the moon rises in the treetops.

Eastern Suburbs Farm.

Gu Yanan and Nan Hanfei took the key given by Mrs. Qiu and entered the farm.

At night, the farm was dark, Nan Hanfei held a flashlight, and Gu Yanan carried a sampling box into Mrs. Qiu's house at the foot of the mountain.

A row of gray-tiled and white-walled bungalows surrounded by large vegetable gardens, cowsheds, sheep sheds, chicken and duck pens, and a large pond not far away.

At night, the frog croaks.

Found the kitchen and turned on the light, there were unfinished meals, half a bowl of tomato egg soup, half-eaten cucumbers, noodle sauce, rice......

Gu Yanan opened the sampling box, took out some of the food in the kitchen, put it into a sterile sampling bag, and sampled the surrounding environment of the kitchen, including soil, well water, cowsheds, chicken and duck pens, and pond water.

After collecting samples around the kitchen, Gu Yanan went to the surrounding vegetable garden again.

Because it was night, even with a flashlight illumination, the light was still dim.

The two of them were walking in the vegetable garden, and there was a lot of mud and cow dung under their feet.

Nan Hanfei shined a flashlight on the cow dung on the ground, and then looked up at the cucumber shelves around him.

Tender green prickly cucumbers adorn the cucumber racks, many of which hang directly from the ground, mixed with dirt and cow dung.

"The fecal-oral route, a common route of transmission of foodborne illness." Nan Hanfei pointed to the mud cucumber on the ground and reminded Gu Yanan.

Gu Yanan plucked two fresh cucumbers stained with soil from the cucumber rack, put them into a sampling bag, and put them in a sampling box.

The two of them walked around the vegetable garden and looked up at the hillside orchard.

In the moonlight, the orchard was black, and the night breeze blew and the leaves rustled.

"Would you like to go to the orchard?" Nan Hanfei asked.

Gu Yanan has actually been afraid of the dark since she was a child, and she is a little better when she grows up, if it weren't for Nan Hanfei by her side today, it would be a terrible thing to let her wander around the dark vegetable garden alone, and then look at the larger hillside orchard, Gu Yanan was worried.

"There is no need to go to the orchard, the samples collected are now representative, and we should go back to the CDC laboratory first, even if the test results of the pathogenic bacteria have not yet come out, the source of infection should be traced back to the source of infection based on the data of the on-site flow survey alone."

——

Lianhai Center for Disease Control and Prevention, Laboratory.

When Nan Hanfei sent Gu Yanan back to the CDC from the Dongjiao farm, it was already 1 a.m.

Colleagues in the CDC lab are working overtime to conduct experiments.

Members of the emergency response team are also in the emergency office to organize the flow of information.

After Gu Yanan thanked Nan Hanfei, he asked him to go back first and return to the emergency office by himself.

Lu Li summarized the flow data of various restaurants in Dongcheng District in the afternoon and handed it to Gu Yanan, explaining: "After comparison and traceability, all food poisoning patients have eaten cold vegetables, and there are cucumbers in the cold dishes in each restaurant, and the source of the cucumbers is traced from the farms in the eastern suburbs." ”

Gu Yanan quickly looked through the sorted out flow information, and all the clues pointed to the cucumbers on the farm in the eastern suburbs.

The on-site investigation traced that the source of infection was a poisonous cucumber from a farm in the eastern suburbs, although there has been no laboratory confirmation, but the next step of epidemic prevention work can be carried out.

Gu Yanan: "An epidemic notice was issued to warn the public and major restaurants to prohibit the consumption of cucumbers produced in the eastern suburbs of the farm, and those that have been purchased should be recalled in time to prevent the further spread of the epidemic." ”

"Okay, I'll send the epidemic notice." Lu Li responded.

"Goofy and I continue to track down the whereabouts of the poisoned cucumber." Zhou Lao responded.

——

At 5 a.m., the sky began to brighten.

The CDC lab has finally come out with the results.

Hemorrhagic E. coli O157:H7 serotype pathogens were detected in the stool of food poisoning patients.

The same pathogenic bacteria were detected in the body of Mrs. Qiu, an old man in the eastern suburbs farm, in the cow dung of the farm's cowshed, and in cucumbers produced in the eastern suburbs farm.

After getting the test report from the laboratory, Gu Yanan began to write a stage summary report of the epidemic.

Old man Qiu from the eastern suburbs farm bought a small yellow cow from a live stock market in the countryside, which contained the hemorrhagic E. coli O157 pathogenic bacteria.

Old man Qiu used cow dung to fertilize the vegetable garden, causing the O157 pathogen to contaminate the cucumbers.

Mr. and Mrs. Qiu ate contaminated poisonous cucumbers, became infected, developed symptoms of food poisoning, and Mr. Qiu developed thrombotic thrombocytopenic purpura complications.

The poisonous cucumbers produced in the eastern suburbs are sold to major restaurants in Dongcheng District.

The customer was infected with O157 pathogens and developed food poisoning symptoms after consuming cold vegetables made with poisoned cucumbers.

Gu Yanan's epidemic summary report had not yet been written, and Gu Qingcen pushed open the door of the emergency office.

He had just returned from the hospital with breakfast he had brought back from the road.

"Xiaolongbao and soy milk, the one at the mouth of the alley of the old street, it's been almost ten years, that shop is still there, I remember your favorite to eat his xiaolongbao."

Gu Qingcen put breakfast on Gu Yanan's desk.

Seeing the breakfast on the table, Gu Yanan's mind went back to seven years ago.

Before Gu Qingcen said goodbye, the two went to school together, got out of school together, and would go to the steamed bun shop at the mouth of the old street and alley every morning to buy two cages of xiaolongbao.

Seven years have passed, and things are not people.

Gu Yanan stared at Xiaolongbao in a daze, and Gu Qingcen asked softly, "Yanan, what's wrong with you?" Did you not sleep all night last night and were tired? Otherwise, you go back and rest, and I'll take care of the rest. ”

Gu Yanan came back to his senses, "No, thank you for your breakfast." ”

For Gu Yanan's thank you, Gu Qingcen felt a chill in his heart, his face froze, and he tried to squeeze out a smile, "You're welcome." ”

"How's it going at the hospital?" Gu Yanan remembered what was going on.

"By the second half of the night, there were no new cases, and by the time I returned, the hospital had received a total of 76 people with food poisoning, 34 of whom were hospitalized, and the rest of the patients with mild symptoms had been discharged home."

"What about Xiaoxiao?"

"It's not serious, I can be discharged from the hospital today."

"Let's hope there won't be any new cases."

"It shouldn't be, Zhou Lao and they have already contacted the Market Bureau to recover the poisonous cucumber, the source of infection has been controlled, and the epidemic has been controlled."

Gu Yanan breathed a sigh of relief, and used the method of on-site flow investigation and tracing to find the source of infection before the laboratory results came out, and controlled the epidemic in time.

Sometimes, traditional flow modulation methods are more direct and effective than advanced experimental methods.

Gu Qingcen glanced at the empty emergency office and asked, "What about the others?" ”

"I asked them to go back to rest after they finished dealing with the matter at hand, and there is still a lot of finishing work to be done today."

"Oh, when are you going back to washing?"

Gu Yanan smelled the smell of cow dung brought back from a suburban farm, and he really should take a shower and change his clothes.

"I'll go back after writing this summary report, you can go first."

"I'll wait for you."

"We're not on the way, you go back to Xinhai Community, I want to go back to my bachelor apartment."

Gu Qingcen smiled slightly, "I don't live in Xinhai Community anymore, in order to get to work, I rented a bachelor apartment in your community, so we stopped by." ”