The group of CDC squeezed through the congratulatory crowd, and Lu Li sighed in a low voice: "It's really a few happy and a few sad." ”

Wang Xiaoxiao leaned over to Lu Li's side and whispered: "There is a happy event here, and there is a funeral not far from the next door, isn't this family unlucky?" ”

Chu Qinggeng also came over, holding two pieces of joy candy in his hand, and said: "Uncle Yuan's suspected poisoning epidemic has just happened, and the family's happy event should have been decided early, and there is no way to encounter this kind of thing." ”

Wang Xiaoxiao said to herself, "Heavenly officials are blessed, and there are no taboos......"

Lu Li joked that Wang smiled, "We are scientific workers, and we can't be superstitious." ”

"You're superstitious, I'm relieving stress."

"What's the pressure on you?"

"I'm not stressed, I'm here to relieve the pressure of this happy event."

Lu Li and Wang Xiaoxiao talked again, Chu Qinggeng left the two of them and silently followed behind Gu Yanan and Nan Hanfei.

Gu Yanan and Nan Hanfei were talking in front, and Chu Qinggeng followed behind, looking thoughtful.

Soon, I arrived at Yuan Chunwang's house in the east of the village.

Yuan Chunwang and his wife were both admitted to the county hospital, and there was no one at home at this time, and the door was open.

The CDC group came over and was about to push the door in, when the neighbor next door saw it and took the initiative to come up and ask Gu Yanan, who was walking in the front, "Hey, what are you doing?" ”

Gu Yanan showed his work card, "We are from the Municipal Center for Disease Control and Prevention, and we came here to do the investigation." ”

The neighbor was a middle-aged woman in her forties, her eyes swept around Gu Yanan and her party twice, and finally figured out their identities, "CDC? It's the former epidemic prevention station, and the affairs of Uncle Yuan's family are also under your control? ”

Gu Yanan wanted to know more clues from his neighbors, which was also part of the on-site investigation, "Well, we suspect that Uncle Yuan's family may be sick because of food poisoning, come over for sampling and investigation, do you know what is different from usual in Uncle Yuan's family recently?" ”

The middle-aged woman seemed to like chatting very much, and began to talk to Gu Yanan about Uncle Yuan's family, "You disease control also think it's food poisoning, and the police came to ask me before, mainly to ask Uncle Yuan if he has a grudge against people in the village, how can it be?"

Uncle Yuan's family is very good, usually when encountering someone in difficulty, will take the initiative to help, and the surrounding neighbors are also good, and often send us food, I and Uncle Yuan are neighbors, the relationship is very good, two days ago also sent us his greenhouse newly planted mushrooms and white fungus.

If you want to say that his family is different from usual, it was Uncle Yuan's birthday yesterday, his son and daughter came to congratulate him on his birthday with big bags and small bags, and he also put a whip at noon, I really listened to it.

Hey, I didn't expect an accident that night, his youngest son's family died in the yard, when the police went to carry people, I was standing at the door, the husband and wife both had purple faces, and they were poisoned to death at a glance, which was too miserable.

Aunt Yuan was also not feeling well at the time, I heard that his eldest son's family was not good living outside the village, and the 120 ambulance came to pull several people away, and I don't know what the situation is now.

I think they must have eaten something unclean during their lunch meal, and your epidemic prevention station should check on them. ”

Gu Yanan also learned some clues from the middle-aged woman's words.

There is a great possibility that there was a problem at the noon dinner at Uncle Yuan's house yesterday, and his sons and daughters had brought things to celebrate their birthdays, but there was a problem with the birthday food they brought?

Gu Yanan pushed open the door and instructed the members of the emergency team, "Sample Yuan Chunwang's home, check the food, water source, and surrounding environment carefully, and the sampling should be complete." ”

"Yes."

Members of the emergency response team began to split up.

Gu Yanan found the kitchen of Uncle Yuan's house.

Because of the hot weather, the kitchen was filled with the smell of food.

On the stove there are leftovers from yesterday's noon, half a pot of rice, half a plate of chicken stewed mushrooms, half a bowl of white fungus sweet soup, and a few cold dishes.

Lu Li could smell the rancid smell of the food while wearing a mask, frowned, and said, "The food is all rancid, if it is caused by bacteria, it is not good to isolate the strain." ”

Gu Yanan looked for a place to put the condiments, found a few small jars in the corner of the stove, opened the lid, and the outermost jar was salt.

Half of the salt is a sign of regular eating, and if the salt used at home is used for the lunch dinner on the birthday day, then nitrite poisoning is unlikely.

Gu Yanan asked Lu Li to sample every condiment and meal.

Chu Qinggeng followed aside, taking a hand from time to time, even if he was studying on the job, and occasionally one or two questions would pop up, such as "Do you want to take all this dish back?" Which part of the dish is more representative? ”

Most of the time, Lu Li was answering, and Gu Yanan would also add a sentence or two.

After coming out of Uncle Yuan's house, the disease control emergency team went to the house of his eldest son Yuan Dazhu, who lived outside the village, to take samples, and then went to the house of his youngest daughter Yuan Chunhua in Xiaozhuang Town.

During the flow survey sampling, Gu Yanan received a call from Mr. Zhou, who was doing flow survey for Uncle Yuan's family at the Qixia County People's Hospital.

Zhou Lao responded to the situation in the hospital, and the 9 patients who were hospitalized all showed dizziness, headache, vomiting, and general fatigue.

Among them, Aunt Yuan and her daughter Yuan Chunhua had severe symptoms, with neurological symptoms such as confusion.

Gu Yanan deliberately asked the patient if he had any symptoms of nitrite poisoning with bruised lips and fingers.

Zhou Lao reacted that except for severe patients with bruising of the lips, other patients with mild symptoms had no symptoms of bruising.

Soon, the two groups of people who went to Yuanjia Village and the county hospital ended their flow one after another and returned to the city.

By the time I got back to the Municipal Center for Disease Control and Prevention laboratory, it was already 2:30 p.m.

Gu Yanan handed over the specimens brought back from the scene to the laboratory, and specially instructed that while isolating the bacteria, chemical poison analysis and pathogen nucleic acid rapid testing should be done first.

——

5:30 p.m.

Lianhai Center for Disease Control and Prevention, Emergency Office.

Gu Yanan got the results of the laboratory feedback as soon as possible.

The patient's vomit, gastric lavage, leftover food, environmental samples, salts and various condiments were analyzed for organophosphorus, arsenic, nitrite and other chemical poisons, and the results were all negative.

The bacteriological nucleic acid rapid test did not detect staphylococcus, salmonella, proteus, clostridium botulinum and Bacillus cereus, which are common bacteria that cause food poisoning.

If the source of the disease has not been identified, could it be some uncommon poison or bacteria?

The cause of the epidemic has not been found, and Gu Yanan has to determine the range of causative factors again in order to guide laboratory testing.

Gu Yanan recalled the situation in his mind when he was on the spot, and he must have overlooked a certain link.

At this time, Nan Hanfei called to ask about the results of the CDC test, and at the same time said that the police's routine poison tests were all negative.

Gu Yanan's voice was muffled, saying that there was no progress on the CDC.

Here, Gu Yanan was still talking to Nan Hanfei on the phone, and Zhou Lao received a call from Qixia County Hospital.

After hanging up the phone, Zhou Lao immediately reacted to Gu Yanan, "There is one more death case, Aunt Yuan died because of her serious condition, multiple organ failure, and the rescue was ineffective." Daughter Yuan Chunhua is being transferred to the city's First People's Hospital. ”