The monkey is nibbling on a green apple in the cage, and the hand holding the apple is very peculiar, and the thumb has degenerated into a small wart.

From the monkey's characteristics, Gu Yanan concluded that it was a West African red colobus monkey.

The environment in the flower room is simulated in the humid and hot climate of the tropics, which not only meets the growth conditions of tropical flowers and plants, but also meets the conditions for the growth and reproduction of tsetse flies.

The tsetse fly is an important link in the chain of transmission of West African trypanosomiasis, which allows for the formation of a closed chain of transmission and creates the conditions for the spread of the disease in West Africa.

Gu Yanan, Lu Li, and Wang Xiaoxiao, the three of them wore special protective clothing against mosquitoes and placed the electric fly trap in the flower room.

Gu Yanan observed the environment of the flower room, there were flies and maggots wriggling in the black soil of the flower pot, and a few small dark brown flying insects were parked on the flower leaves.

The small flying insects are smaller than the flies, and their two small wings overlap each other, and when they are disturbed, they take off one after another.

These small flying insects are the blood-sucking insects from Africa, the tsetse fly.

The trio caught live tsetse flies in the flower room, and conducted a series of samples of flowers, plants, birds, and even soil in the flower room, and also collected the blood of the monkeys in the cage.

The samples were sent back to the CDC's lab, and the test results were available quickly.

Trypanosomes were detected in the blood of monkeys in cages in flower houses.

Trypanosomes were detected in the tsetse flies of the flower room.

Tsetse fly eggs were detected in the soil of the flower house.

Gu Yanan decided to temporarily block the Qingheyuan Flower and Bird Market and its nearby flower shops to carry out large-scale investigations and carry out pest sanitization operations.

Gu Yanan thought of Uncle Ge's illness again, although Uncle Ge had been to the Qingheyuan Flower and Bird Market, but Nan Hanfei had never been there, Nan Hanfei had only come into contact with Uncle Ge and his small courtyard, so it was speculated that there should also be tsetse flies carrying trypanosome worms in Uncle Ge's small courtyard.

Gu Yanan took the staff of the CDC to Uncle Ge's courtyard, and traces of tsetse flies were also found in the glass flower room of Uncle Ge's courtyard.

After on-site investigations, laboratory tests, and interviews with the sick people, the truth about the outbreak of West African trypanosomiasis slowly emerged.

A year and a half ago, Zheng Licai, the owner of the flower shop, asked someone to smuggle in a batch of soil from West Africa for raising flowers in order to make the tropical flowers in his flower house grow better, and at the same time a wild monkey from West Africa was smuggled in.

The soil was not inspected by customs and contained tsetse fly eggs.

Wild monkeys carry the pathogen of West African trypanosomiasis, Trypanosomes gambiense.

The soil from West Africa was used by Zheng Licai to raise flowers, and at the same time, he gave some of the soil to Uncle Ge in his personal name, and Uncle Ge used the soil in his own flower house.

The hot and humid climate in the flower house is similar to that of the tropical climate of West Africa, and the eggs of the tsetse fly hatch into adult tsetse flies in the soil.

The adult tsetse fly sucked the blood of the monkey with trypanosomes, and then bit the guests who came to the flower house, and spread the trypanosomes from the monkeys to the people who came to the flower house through the tsetse fly.

Chain formation of transmission of West African trypanosomiasis.

The glass flower room in Uncle Ge's courtyard is similar to the temperature-controlled flower room near Zheng Licai's flower and bird market in Qingheyuan, and it also forms a living environment for tsetse flies.

The eggs of the tsetse fly hatched into an adult tsetse fly, which bit Uncle Ge who was infected in Zheng Licai's flower room, and after the tsetse fly contained trypanosomes in its body, it bit Nan Hanfei who came to help in Uncle Ge's flower room.

This is how the outbreak of Trypanosomiasis spreads.

Gu Yanan led the members of the disease control team to comprehensively sanitize the Qingheyuan Flower and Bird Market, the glass flower house in the Gejia Courtyard, and the surrounding places that may be involved in breeding tsetse flies.

The sick are healed and the chain of transmission is broken.

The outbreak of Trypanosomiasis in West Africa has finally been brought under control.

——

The First People's Hospital of Lianhai City, Infectious Disease Ward.

After the outbreak of West African trypanosomiasis was brought under control, Gu Yanan temporarily had more time to visit Nan Hanfei in the hospital.

As usual, Gu Yanan came to the hospital with the porridge he had boiled before.

This time, Gu Yanan did not directly enter Nan Hanfei's ward, but watched Nan Hanfei lying on the hospital bed and swiping his mobile phone through the glass door.

Gu Yanan stood at the door, thoughtful.

Nan Hanfei on the bed was alert to the fact that there was someone at the door, and suddenly raised his head.

The eyes are facing each other.

Nan Hanfei put away his mobile phone and smiled at Gu Yanan, who was standing at the door: "Why don't you stand outside the door and not come in?" What are you looking at me with? It looks like gazing affectionately at a lover, and I'm going to misunderstand you like this. ”

Gu Yanan walked into the ward, put the porridge in the thermos pot next to the bed, and said with a smile: "I saw you scrolling on your mobile phone on the hospital bed just now, and suddenly remembered a good idea." ”

"What's the idea? Did you see that I was idle and wanted to ask me out? ”

Gu Yanan ignored Nan Hanfei's flamboyant tongue, opened the lid of the thermos pot, and propped up the small table on Nan Hanfei's hospital bed, while saying: "Nowadays, people like to play with their mobile phones and brush up on the circle of friends, I suddenly remembered to write some popular science articles, but it is not an ordinary popular science article format, but it looks like an infectious disease circle of friends." ”

"Infectious disease friend circles? This idea sounds like a novelty, but what is it? Let's hear it. ”

Gu Yanan put the porridge on the small table on the hospital bed, handed the spoon to Nan Hanfei, and said, "Now it's just some preliminary ideas, you can go to my WeChat circle of friends to check it out in two days." ”

Nan Hanfei sat on the hospital bed, smelling the fragrance of rice porridge, suddenly felt hungry, and was about to eat, when he suddenly remembered something, and leaned back on the hospital bed, pretending to be weak.

"What? Under the weather? Gu Yanan asked with concern.

Nan Hanfei deliberately covered his chest with his hands, and after coughing, he began to say: "It's okay, it's just that I don't have the strength to do it, it may be that the symptoms of this West African trypanosomiasis will last for a while." ”

Before coming to the ward, Gu Yanan had already read Nan Hanfei's recent medical records in the doctor's office, and knew that Nan Hanfei was fine and could be discharged from the hospital tomorrow.

At this time, the symptoms of weakness that Nan Hanfei showed were completely faked.

Gu Yanan did not debunk Nan Hanfei, but followed Nan Hanfei's meaning and said: "If you don't have the strength, it seems to be serious, I'll go find the attending doctor." ”

Nan Hanfei hurriedly sat up and stopped: "No, no, it'll be fine in a while." ”

Gu Yanan stopped, "Really? ”

"No, you feed me first, and when I'm full, I'll naturally have strength."

Gu Yanan couldn't help laughing, "I don't even have the strength to eat, I'd better call a doctor." ”

Gu Yanan made a gesture to leave, Nan Hanfei stretched out his hand and grabbed Gu Yanan's arm, with great strength, Gu Yanan wanted to pull his arm away, but he couldn't pull it.

Nan Hanfei no longer pretended to be sick, "Okay, don't joke with you, I'm really fine, you stay, at least talk to me, wait for me to finish eating, take the thermos pot away, and continue to deliver food at night." ”

Nan Hanfei quickly finished eating, and when Gu Yanan was about to leave the ward, Nan Hanfei shook his mobile phone and said with a smile: "Waiting for your popular science article - the circle of friends of infectious diseases." ”

That night, Gu Yanan posted the first circle of friends with this West African trypanosomiasis as the protagonist.