Lianhai First People's Hospital, Department of Infectious Diseases.

In the infectious disease ward, Gu Yanan met with the chef of the Golden Bay Hotel.

The chef, who was diagnosed with the parasite, is now receiving deworming treatment, and the symptoms of pain all over his body have been reduced, but because of the disintegration of the worm body and a systemic allergic reaction, the whole person does not look very good.

The chef reported the situation to Gu Yanan, "I want to report our hotel for being fake and shoddy." ”

"Be specific, please."

"More than a month ago, the manager of our hotel was replaced, and it was replaced by the manager Zhang you questioned during the investigation.

Since he took office, he has cut back on the cost of procuring ingredients, and he has replaced the precious conch meat with ordinary freshwater snail meat to reduce costs.

The newly replaced manager Zhang bought a batch of Fushou snails from outside, and the medium-rare Fushou snails have been processed and seasoned to replace the precious conch meat on the table, and it is difficult for ordinary customers to tell the difference between the two.

When he asked me about it, I hesitated, I knew it was a deception to consumers, but I didn't expect it to be so serious.

I just heard the doctor say that your disease control detected a parasitic infection in the cold conch meat in our hotel, all because I didn't withstand the pressure, Manager Zhang said that the taste of fully cooked Fushou snail and conch meat is very different, and it will be discovered by consumers, let me blame me for using five mature, and now I have been retributed......"

The chef was very regretful and annoyed, and Gu Yanan interrupted his nagging and regretful words, "Can you still provide evidence now?" For example, are there any procurement records, or are there any Fushou snails purchased before? ”

"There is evidence, I know where they put the purchased Fushou snails, it is in the cold storage on the second basement floor of the hotel, and there are a lot of them. I also have a record of the hotel manager's purchase, not a paper version, it is an electronic photo taken secretly by me with my mobile phone, they bought it from a rural village in Cangnan County, I heard that it is a local farmer fishing in an ordinary mud ditch, and it is not a regular farm, and it is very cheap. ”

After getting the news, Gu Yanan immediately informed Gu Qingcen and his party to go to the cold storage on the second basement floor of the hotel to look for Fushou snails.

——

Golden Bay Hotel, 2 basement cold storage.

Because the patient's family reported the case, the hotel manager, who had been controlled by the police, led the CDC and the police to open the door of the cold storage on the second basement floor.

In addition to other ingredients in the cold storage, four large baskets of Fushou snails were also found, of which the big ones weighed more than a catty, and the ordinary ones weighed half a catty.

According to the hotel manager, in the month since he took office, many kinds of precious seafood products in the hotel have been replaced by low-priced similar products, including the snail meat of the freshwater snail in the Fushou snail instead of the precious conch meat for cold dishes.

The Fushou snails in the cold storage were collected, and after testing by the disease control laboratory, the larvae of the third stage of Angiostrongyloides guangzhou were detected, which confirmed that these Fushou snails were the source of the outbreak of the strange disease in Lianhai City.

Evidence was found, the hotel manager was taken away by the police for investigation, and the hospital also treated the patient according to Angiostrongyloides cantonensis, and the patient gradually improved.

The Center for Disease Control and Prevention carried out timely publicity and publicized through various channels that "eating raw snail meat can be infected with strange diseases".

Under the influence of publicity, the habit of eating freshwater snail meat has changed, and there have been no new cases.

Although the epidemic is under control, the CDC's investigation is not over.

The foci of the Fushou snail infected with the parasite have not been identified.

——

Lianhai City, Cangnan County.

According to the purchase record of Fushou snail provided by the chef, Gu Yanan and his party found Shanbei Village in Lushan Town, Cangnan County.

This is the growing place of the snails purchased by Golden Bay Liquor.

The emergency response team led by Gu Yanan was to conduct a survey of the host and intermediate host of Angiostrongylus cantonensis in Shanbei Village and several surrounding villages.

In addition to humans, there are rats in the terminal host, so it is necessary to catch wild rats in these natural villages.

The intermediate host is a variety of freshwater snails, the most important of which is the Fushou snail.

With the assistance of local county disease control staff, the emergency team led by Gu Yanan caught more than a dozen wild rats with rat traps, rat traps and sticky rat boards.

He also caught more than 100 snails in ponds and mud ditches in various villages.

Bring back the CDC lab test.

A large number of Angiostrongylus cantonensis adults were found in field mice, and 47 adults were found in one of them.

Stage 1 larvae of Angiostrongyloides cantonensis were detected in the feces of rats in the wild.

More than 1,000 larvae of the third stage of Angiostrongyloides guangton were found in Fushou snails, of which 720 were detected in the largest one.

Shanbei Village and several surrounding villages in Cangnan County have been confirmed as natural foci of Angiostrongylus cantonensis.

Under the guidance of the Center for Disease Control and Prevention, a large-scale snail eradication operation was carried out in the local area.

——

Lianhai Center for Disease Control and Prevention, Emergency Office.

Gu Yanan is writing a summary report on the outbreak of the strange disease caused by Angiostrongyloides cantonensis.

Shanbei Village, Cangnan County, previously introduced Fushou snail breeding from the south.

Because of the poor economic efficiency, the villagers gave up breeding and discarded a large number of Fushou snails in the fields.

Fushou snails have no natural predators in the local area, multiply in large numbers, and carry Angiostrongylus cantonensis, forming a natural foci.

In order to make profits, the new manager Zhang of Golden Bay Hotel purchased wild Fushou snails from Shanbei Village to replace conch meat as the hotel's cold conch meat ingredients.

After eating the half-lived Fushou snail meat, the customer was infected with Angiostrongyloides cantonensis, causing helminth migranulosis and eosinophilic meningitis, which is what the public calls a "strange disease".

The epidemic was brought under control after the investigation of the source of the epidemic was discovered, and the snail eradication operation and the propaganda of "not eating raw snail meat" were carried out.

After writing the summary report, Gu Yanan looked up after archiving it and found Gu Qingcen sitting at the opposite desk watching her every move.

Raise your eyes and look at each other.

Gu Yanan smiled slightly with questions, "Brother Qingcen, is there something wrong with you staring at me like this?" ”

Gu Qingcen seemed to come back to his senses and coughed, "Oh, just now I was thinking about the situation of catching Fushou snails in Shanbei Village before, the local Fushou snails have been flooded, and many villagers have been infected with strange diseases before, if it weren't for the incident of the Golden Bay Hotel this time, maybe the strange diseases of the villagers will continue." ”

Gu Yanan nodded approvingly, "Well, the Fushou snail first came from South America, because of the fast reproduction, large size was introduced into various places for breeding, but I don't know that this is a biological invasion, especially in China, the Fushou snail has no natural enemies, a large number of reproduction in addition to causing ecological imbalance, but also carrying parasites, destroying the ecology and turning the local area into a natural foci of strongyloides, the victim is the local people. ”

Lu Li accosted, "Fortunately, the snail extermination action was taken in time, and the density of Fushou snails in Beishan Village has dropped significantly." ”

Gao Fei: "It's not so easy to wipe out a species in an ecological environment, and if it doesn't last for a few years or even decades, the local snails won't become extinct." ”

Wang Xiaoxiao stared at Gu Qingcen, remembering the situation when he helped dissect wild mice in the laboratory to find parasites, at that time, the laboratory was short of manpower, and the members of the emergency team went to help, and Gu Qingcen's dissection technique was extremely skillful.

Wang smiled: "Gu Dashen, did you often dissect mice abroad before?" ”

"Why do you ask?"

"It's just a matter of looking at how you do your experiments, and I'm curious."

Gu Qingcen paused slightly, "I rarely dissect mice, but I often dissect people." ”

Wang Xiaoxiao was stunned for a moment, "Dissect...... Person? Living? Or a dead man? ”

"Of course it's a dead person, I did a pathological autopsy abroad for a while."