Gu Yanan wore waterproof gloves and picked up the small snail from the sludge.

In the sunlight, the little snail has strange threads on its body, and it glows with a dull red.

"Blister snails!"

Gu Qingcen and Gu Yanan spoke in unison.

The origin of the blister snail is in Africa, many years ago there was no in China, until a few years ago there were literature reports in Taiwan and Hong Kong found biological invasive species blister snails, under various measures, the invasion trend was curbed in time, and now there are blister snails in Lianhai City, and it is in the natural environment, how did they come?

Vesicular snails are also intermediate hosts for Schistosoma haematoidosis and can be endemic as long as they are present.

Gu Qingcen rowed a small boat around the lotus pond according to Gu Yanan's request, and fished out the blister snails at different locations.

Lu Li and Wang Xiaoxiao, who were not far from the lotus pond, rowed another small boat and also fished out the blister snails, but Wang Xiaoxiao didn't know them, and when they saw these small snails in the silt, they shouted to Gu Yanan with some excitement and some doubts, "Sister Yanan, we fished out some small snails, not field snails or mud snails, could it be blister snails?" The mouth is oval and has a slightly dark red tint. ”

"Catch some more, and we'll talk about it when we get ashore in a moment."

Two small boats went ashore, and four people packed the collected freshwater snails into sampling bags on the shore close to the lotus pond.

Wang Xiaoxiao wore gloves, picked up one of the small snails, and asked, "Sister Yanan, this shape should be a blister snail, right?" ”

"Yes, there is a good chance that this vesicular snail has the cercariae parasitism of Schistosoma haematoidos, so be careful."

Wang Xiaoxiao threw the small blister snail into the sampling bag, patted the mud on his hand, and sighed: "Fortunately, I am prepared, and I have protective equipment on my hands and feet, but Sister Yanan, why are there so many blister snails here?" And it is only in the lotus pond of Uncle Zhang's house, we went to the lotus pond of other houses to check, and we didn't catch this kind of blister snail, which is really strange! ”

"I also think it's strange that the source of this blister snail needs to be investigated in detail."

Gu Yanan was thinking about the next plan of action when suddenly the mobile phone in his pocket rang.

Taking off his gloves with mud, Gu Yanan picked up his phone.

Caller ID, office landline number of the CDC laboratory.

After the phone was connected, colleagues in the laboratory directly reported the results, "Director Gu, the eggs detected in the patient's urine centrifugal specimen sent by our laboratory from the People's Hospital are confirmed to be Schistosoma haematobium eggs. ”

The results of the experiment were the same as Gu Yanan's prediction, and it was indeed Schistosoma haematoidos.

"We have collected another batch of water samples and freshwater snails from Hetang Village, and we need your help to test whether the water and freshwater snails contain the cercariae of Schistosoma haematoides."

"No problem, let's send the sample quickly."

"Okay, we're still in Hetang Village now, and the sample will be sent over in about an hour......"

Before Gu Yanan's phone call was answered, a dog barking suddenly came from behind everyone.

Wang Xiaoxiao was most afraid of dogs, and as soon as he heard the sound of a dog barking, he immediately jumped up, and hid behind Lu Li without thinking, because the movement was too big, he knocked Gu Yanan, who was answering the phone next to him, into a stagger.

Gu Qingcen behind Gu Yanan hurriedly supported her and pushed her forward to prevent Gu Yanan from falling into the lotus pond, but Gu Qingcen slipped under his feet and fell into the water because of the reaction force.

Everything happens in an instant.

Gu Yanan only felt that he had been hit by someone, and then he was pushed by someone, and then he heard a "plop" in the lotus pond behind him, and when he looked back, he found that Gu Qingcen had fallen into the lotus pond.

"Brother Qingcen, hold my hand!"

Gu Yanan hurriedly collected the phone, approached the shore, and stretched out his hand to pull Gu Qingcen out of the water.

The two hands were about to lean together, but Gu Yanan noticed a powerful force behind her and pulled her back.

A figure appeared beside him, stretched out his hand to replace Gu Yanan's hand, and pulled Gu Qingcen out of the water.

"Nan Hanfei?! Why are you here? ”

Nan Hanfei appeared unconsciously.

"There have been murders here, and I came here for a second examination of the scene."

After Nan Hanfei pulled Gu Qingcen out of the water, he didn't pay attention to him, but spoke to Gu Yanan, "The deceased found here the day before yesterday was confirmed to have drowned after an autopsy by our police forensic doctor, but schistosomes were found in his body during the autopsy. ”

"The deceased was a schistosomiasis patient?" Gu Yanan asked in surprise.

"Yes, although the deceased was a schistosomiasis patient, the cause of his death was not schistosomiasis infection, but because he fell into a lotus pond and drowned because of drunkenness, the police station has a detailed autopsy report, do you want to see it?"

"Well, as long as it's related to this schistosomiasis outbreak, I want to know about it."

"Okay, I can take you to the police station now, and you can read the autopsy report or even the body."

In order to work, Gu Yanan wanted to fly away with Nan Han, but she was very worried about Gu Qingcen, who had just fallen into the water.

"Brother Qingcen, can you go home and change your clothes by yourself?"

Gu Qingcen wiped a handful of water on his face, "I can do it myself, the work is important, you go and get busy, I just want to trouble Lu Li and Wang Xiaoxiao to bring the specimen back to the laboratory." ”

Several people acted separately, Gu Qingcen went home to change clothes, Lu Li and Wang Xiaoxiao brought the water samples and freshwater snails collected from Hetang Village back to the disease control laboratory, and Gu Yanan followed Nanhai to the police station to check on the deceased.

——

Lianhai City, Police Station.

Nan Hanfei showed Gu Yanan the autopsy report of the deceased Zhang Fuquan in Hetang Village, and there were photos attached to it.

After reading it, Gu Yanan was sure that the deceased had indeed been infected with schistosomiasis haematosis before his death.

The deceased was a villager from Hetang Village, a bachelor who usually lived alone, and his epidemiological history during his lifetime could only be determined by asking his relatives or neighbors.

After reading the autopsy report, Gu Yanan happened to meet the family members of the deceased who came to the police station to collect the body.

The family member who came was Zhang Fuquan's sister Zhang Cuihua.

Zhang Cuihua married in a neighboring village many years ago and has a 10-year-old son.

Now it is Zhang Cuihua's family, Zhang Cuihua and her son.

Zhang Cuihua was taken to the morgue by the police, while her husband and 10-year-old son remained in the office hall of the police station.

Zhang Cuihua's heart-rending cry soon came from the morgue.

Gu Yanan listened to it in her ears, felt very uncomfortable, walked out of Nan Hanfei's office, and saw Zhang Cuihua's husband and her 10-year-old son.

The little boy was sitting in a chair, scratching his arms with both hands.

Because it was summer, the little boy was only wearing short-sleeved shorts, and he could see that there were many red spots on the exposed skin, and some places had broken and bleeding because of scratching.

Gu Yanan thought that the little boy was the nephew of the deceased Zhang Fuquan, and it was very likely that he had gone to Hetang Village to play, and the little boy's current symptoms reminded her of a very typical early symptom of schistosomiasis - cercarial dermatitis.

Gu Yanan walked up to the little boy, leaned down to face the little boy, and asked, "When did the red dots on your body start to appear?" ”

The little boy was questioned by a stranger, and although he was a beautiful sister, the little boy was still a little shy and did not answer, but turned his head to look at his father who was sitting next to him.

Seeing this, the little boy's father was suspicious of Gu Yanan's identity, "Who are you?" ”

"I'm a CDC staff member and would like to ask your son some questions."