"Yes, Old Man Wang was hit by a car when he was young and broke his leg, and he hit a steel nail in his leg." Uncle Ge replied.

"What time is it?"

Uncle Ge thought for a while, "It was about 40 years ago. ”

40 years! If it is a iatrogenic infection, this incubation period is too long, and this route of transmission can be ruled out.

"Does Uncle Wang usually eat beef and mutton? Especially imported beef and mutton. ”

"I like it, Old Man Wang likes to eat beef the most, but he is usually reluctant to buy it, and every time he eats it, he picks up the kind of beef that is discounted in the market."

Gu Yanan thought to himself, now that the scope is large, do you want to check all the markets where Uncle Wang once bought beef and mutton?

Even if you go to the market to check, you have to check the market a year or two ago, and it doesn't make much sense to change batch after batch of beef.

However, the vendors in the market have a fixed place to buy their goods, and it is also a good idea to check whether there has been an outbreak of mad cow disease or imported feed in the cattle farms where they are buying.

Gu Yanan was thinking about the next plan of action in his heart, and Uncle Ge suddenly said: "Speaking of imported beef, I remember, half a year ago, my son sent me a batch of food from Germany, which contained foreign beef sausages, I knew that the old man Wang liked to eat it, and I was not willing to eat it myself, so I gave it all to him." ”

Imported beef sausages! And it's made in Germany!

Gu Yanan remembers that one of the beef sausages produced in Germany was made from the meat next to the spine of the cow, and if the cattle from which the sausage meat came were infected with mad cow disease, the sausage could spread the prion to human eaters, causing Creutzfeldt-Jakob disease in humans.

Gu Yanan hurriedly asked, "Are there any imported beef sausages that were sent?" ”

"I don't know, I gave it to Old Man Wang, and I didn't ask him if he finished eating, but it's been more than half a year, I think it should have been eaten early."

Uncle Ge couldn't get a definite answer here, so Gu Yanan decided to go to Uncle Wang's house to check it out for himself.

——

Uncle Wang's home.

Gu Yanan and Lu Li took the key given by Uncle Ge and opened the door of Uncle Wang's house.

Because of the purpose of the search, Gu Yanan went straight to the kitchen of Uncle Wang's house and found the uneaten beef sausage in the bottom freezer of the kitchen refrigerator.

There is still half a beef sausage left in a bag, this beef sausage is the same as Uncle Ge described, only a mark of a certain farm is pasted on the package, there is no specific production date and production site, it should be the batch of imported beef sausages that Uncle Ge gave to Uncle Wang.

After putting imported beef sausages into the sampling box, Gu Yanan and Lu Li sampled some commonly used foods in Uncle Wang's kitchen, including a plate of boiled meat in the refrigerator.

Sending the food specimens collected from Uncle Wang's house back to the CDC laboratory, Lu Li began to work again to detect prions from these food specimens.

The results came out quickly, and as Gu Yanan expected, prion was detected in the batch of imported sausages that Uncle Ge gave to Uncle Wang.

The real culprit of Uncle Ge's infection with Creutzfeldt-Jakob disease is this batch of imported beef sausages that were mailed back.

Gu Yanan began to investigate the source of imported sausages again.

Gu Yanan checked the outer packaging of the sausage, and there was no specific manufacturer and production address, more like it was processed from his own farm for his own food.

These beef sausages were mailed back from abroad by Uncle Ge's son, and Uncle Wang was the only one who ate them.

If you want to find out the origin of beef sausages, you have to contact Uncle Ge's son.

Soon, Gu Yanan learned the source of this batch of sausages from Uncle Ge's son.

It turned out that Uncle Ge's son heard that the beef sausages produced on a certain farm in Germany were very famous, and in order to fulfill his filial piety to Uncle Ge, Uncle Ge's son drove to that farm, ordered a batch, and mailed it back to Uncle Ge.

The farm that Uncle Ge's son said about producing sausages is in the same mad cow disease epidemic area as the production area where Wu Gang imported cosmetics.

The source of the Creutzfeldt-Jakob disease outbreak has finally been completely investigated, and it is this farm abroad with a mad cow disease outbreak.

After the epidemiological investigation was completed, the source of the transmission of Creutzfeldt-Jakob disease was known, and the relevant parties urgently introduced a policy to prohibit the import of food and cosmetics from the BSE-epidemic area.

However, at present, there is no treatment for Creutzfeldt, and patients in hospitals can only be treated symptomatically, and the only consolation is that the source of infection has been identified, preventing the further spread of Creutzfeldt.

Gu Yanan began to write a report on the handling of the Creutzfeldt-Jakob epidemic.

An outbreak of mad cow disease broke out on a farm abroad.

A sick cow infected with prions is slaughtered before the onset of the disease.

The spine meat of a sick cow is made into beef sausages.

Brain sugar, placenta, collagen, etc. from sick cows are made into cosmetics.

These cosmetics contaminated with mad cow disease prion were purchased by Wu Gang, escaped entry and exit inspection and quarantine, and were sold to various parts of the country, and Zhang Li, Liu Meili and 14 other women were the victims of this batch of cosmetics.

After Zhang Li and others used this batch of cosmetics containing prions, they successively developed symptoms of Creutzfeldt-Jakob disease.

The beef sausages contaminated with BSE prions were sent back to Uncle Ge by mail by Uncle Ge's son.

Uncle Ge because his friend Uncle Wang likes to eat beef, so he transferred all the beef sausages sent back by his son to Uncle Wang.

After eating these imported beef sausages mailed back, Uncle Wang was infected with prions and contracted Creutzfeldt-Jakob disease.

After writing the epidemic handling report, Gu Yanan couldn't help but sigh with emotion: Although purchasing agents can save money, it also saves the key threshold of entry-exit inspection and quarantine.

——

A few days after the investigation into Creutzfeldt-Jakob disease ended, Gu Yanan received a call from Nan Hanfei.

Nan Hanfei's tone on the phone was a little sad and anxious, "Uncle Wang passed away in the hospital yesterday, Uncle Ge feels that all this is because of him, if it weren't for him transferring the imported beef sausages that his son gave him without quarantine to Uncle Wang, Uncle Wang would not have been infected with mad cow disease, and Uncle Wang would not have died."

Uncle Ge blamed himself very much, and his mood was always low.

When I went to see him this morning, the red-billed firefinch that Uncle Ge had been keeping was also dead, and when I left, I found Uncle Ge quietly wiping his tears alone in his glass flower room. ”

Gu Yanan knew that Uncle Ge's son was not by his side, and he had lost his friend for many years, and now was the time to need someone to accompany and comfort him.

Gu Yanan responded to Nan Hanfei on the phone, "After work today, I will go to the flower and bird market to buy a red-billed firefinch, bring it to Uncle Ge, and then accompany Uncle Ge to talk." ”

Nan Hanfei's mood was a little better, "Okay, I'll accompany you to the flower and bird market to choose a red-billed firefinch, originally I wanted to buy it myself, but I was worried that if I chose one that carried a virus or parasite, wouldn't it hurt Uncle Ge, I remembered that you were such an expert, so I wanted to call you along." ”

Gu Yanan: "It turns out that this call of yours was premeditated, how do you know that I will offer to buy a red-billed firesparrow?" ”

Nan Hanfei's tone on the phone was full of laughter, "Because I understand you." ”