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

A nine-year-old boy is lying in a hospital bed with a hanging needle on his arm, and his parents are accompanying him.

Entering the ward, Gu Yanan first identified himself.

When the little boy's parents heard that they were from the CDC, they said that they would be very cooperative.

The little boy's name is Lele, who lives in the western suburbs of Lianhai City, and he developed fever symptoms two weeks ago and went to a suburban hospital for treatment.

The doctor's clinical diagnosis found that Lele had been bitten by mosquitoes, the bite site was swollen with local skin, red dot tissue appeared in the center, and the subcutaneous tissue was found to be infiltrated with lymphocytes, histiocytes and a small number of eosinophils and macrophages.

Originally, Lele's parents didn't pay attention to this symptom, and only thought that they were bitten by some bug, but later Lele's grandfather also had similar symptoms, and the high fever did not return and he had drowsiness.

Lele's parents noticed that something was wrong, and his grandfather and grandson were sick at the same time, maybe it was some kind of infectious disease.

Lele's grandfather was treated in the hospital, and his medical records were picked out by Wang Xiaoxiao, which was one of the 26 patients.

Lele's grandfather received a notice from the local CDC, and Lele's parents sent the grandfather and grandson to the hospital at the same time, and when they were checked, they were infected with West African trypanosomiasis at the same time.

According to the progress of Lele's disease, Gu Yanan estimated that Lele had just been infected with trypanosomiasis two weeks ago, which is very important for finding the source of the disease.

Gu Yanan asked Lele, "Two weeks ago, where did Lele go?" ”

The nine-year-old boy still spoke in a milky voice, "I go to class during the day, I do my homework at night, and I don't have time to play." ”

The parents of the little boy who accompanied the bedside also accosted him at this time: "Lele is in the fourth grade this year, in addition to attending classes at school during the day, we also enrolled him in a few tutorial classes, children, can't lose at the starting line, so he has a full schedule, no time to go out to play, let alone go to Africa, how can he get that West African trypanosomiasis?" ”

Gu Yanan sympathized with the little boy in his heart, he had to attend various training classes at such a young age, and he was really tired of living more than adults going to work, but to get back to the point, to find the source of the disease, to know the usual life trajectory of the little boy Lele and his grandfather.

Gu Yanan asked again: "Two weeks ago, where did Lele and his grandfather go together?" ”

The little boy Lele thought about it and was about to speak, but he opened his mouth and didn't say anything, his eyes glanced at his parents standing beside the bed.

Gu Yanan immediately understood the child's thoughts, the child was afraid that there was something to hide from his parents.

The little boy's parents saw that Xiao Lele didn't speak, so they said to Gu Yanan: "My family Lele usually goes to the training class after class, and there are nannies to pick him up, basically not with his grandfather, and I don't know how the two of them get the same disease?" ”

Gu Yanan knew at a glance that Lele's parents were usually busy with work, and they didn't have time to take care of the children, but they had high requirements for the children, so they invited a special nanny.

Although such parents have good intentions, they will always miss some information about their children, such as what they want to talk about and want to hide.

Gu Yanan continued to ask Lele, "Was Lele with Grandpa two weeks ago?" If there is anything, tell Auntie, it is very important, it is related to how Lele and Grandpa got sick. ”

Lele suddenly asked, "If I say it, will Grandpa's illness be cured?" ”

"If Lele said it, we might be able to find out the source of the disease, so that grandpa will be cured, he will not be infected again, and more people will be prevented from contracting this disease."

Lele said timidly: "Two weeks ago, on the weekend, grandpa took me out to play. ”

Lele's mother next to the hospital bed suddenly became a little angry, "There are three tutoring classes on weekends, why does Dad take Lele out to play?" Where have you been? ”

Lele's voice was even quieter, "I didn't go far, I went to the flower and bird market, and my grandfather took me to see the birds." ”

It was a flower and bird market again, Gu Yanan became vigilant in his heart and asked, "Which flower and bird market?" ”

"Qingheyuan Flower and Bird Market."

"What storefronts have you visited? Do you remember the name of the store? Did you get this red and swollen skin from being bitten by insects in the flower and bird market? ”

"I've been to many stores in the flower and bird market, and I don't remember all the names, but I know where the red dot on my arm was bitten."

"Where? Which store in the Bird and Flower Market? ”

Lele shook his head, "It's not in the flower and bird market, it's in a big flower house not far from the flower and bird market, there is a biting fly in it, the fly bit my arm, I slapped it to death, and the fly's stomach was full of blood." ”

Lele's mother, who was standing beside the hospital bed, smiled a little awkwardly and said, "The child has little knowledge, and the bag on his arm must be bitten by mosquitoes or other insects, how can any flies bite people and suck blood." ”

Lele didn't speak, and Gu Yanan felt strange.

Could it be that the biting fly that Lele said is a tsetse fly?

Gu Yanan used his mobile phone to pull up a picture of a tsetse fly, put it in front of Lele, and asked, "Is it this kind of fly that bites you?" ”

Lele looked at the picture on the flat of the phone, and after a while, nodded, "Yes, it's this kind of fly, it's small, and it hurts a little bit." ”

There are live tsetse flies in the natural environment of Lianhai City, but they only exist in tropical Africa!

"Lele remember the address of that flower house?"

"Yes."

Gu Yanan got the address, and immediately called Lu Li and Wang Xiaoxiao, took the sampling box, put on protective equipment, and went to the flower house where there might be tsetse flies.

——

In the western suburbs of Lianhai City, near the Qingheyuan Flower and Bird Market, there is an artificially temperature-controlled flower house.

The flower house here is not far from the Qingheyuan flower and bird market, the owner of the flower house is the middle-aged bald boss who hired Chen Dali to do carpentry, the boss's surname is Zheng and his name is Licai, and the people nearby call him Zheng Boss.

Boss Zheng built a large private flower room here, which raised all kinds of flowers and plants, many of which were tropical plants.

Because tropical plants have high requirements for temperature and humidity, Zheng Licai built a flower room with artificial temperature control here.

After the flowers and plants are raised here, they will be moved to the rented façade of the Qingheyuan Flower and Bird Market for sale, and some customers are not satisfied with the flowers and plants in the storefront, so they will be directly brought to this large flower house by Boss Zheng for selection.

Gu Yanan deduced from the clues provided by the patient that on the weekend two weeks ago, Grandpa Lele took Lele to the Qingheyuan Flower and Bird Market, and took a look at Boss Zheng's flower shop and felt dissatisfied.

Gu Yanan took Lu Li and Wang Xiaoxiao to inspect the flower room here.

In the artificially controlled flower room, the temperature and humidity are very high, and rows of tropical plants grow in the pots of the flower stands, and some of the flower leaves are dripping with water droplets.

There is a cage in one corner of the flower room in which a monkey is kept.

The monkey has a slender body, brownish-red hair, and a white fur on its belly on the railing of the long tail cage, which is very conspicuous.