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

Gu Yanan and Gu Qingcen appeared in the corridor of the infectious disease ward with the sampling box.

Gu Jiashu handed over the medical records of patients from Hetang Village to Gu Yanan to look through.

From the clinical symptoms alone, it is indeed more consistent with the symptoms of schistosomiasis haematosis.

Gu Yanan confirmed again, "Brother, you asked about the epidemiological history of the patients before, and they really haven't been abroad recently?" ”

"It's really not, the villagers of Hetang Village have been growing lotus root and raising fish for a living for generations, and going abroad is a big deal, even if he wants to hide it, other villagers will know, all I can ask are on the medical records, and no matter how specific the situation is, you CDC and ask the patient."

Inside the infectious disease ward.

Gu Yanan and Gu Qingcen asked the patients separately, and Gu Yanan started with Zhang Youfa and Uncle Zhang.

Uncle Zhang talked about his recent situation, when he began to have fever, and when he began to have symptoms of urgency, frequency, and painful urination.

Gu Yanan asked if Uncle Zhang had recently gone abroad.

Uncle Zhang shook his head, "I have never been abroad in my life, and the farthest place I have ever been to is the provincial capital city when my son was in college, but my son is now abroad." ”

"Which country?"

"Africa, I don't know which country it is."

Gu Yanan felt that there was a clue that Schistosomiasis haematobium is endemic in Africa, and if Uncle Zhang's son is infected with schistosomiasis from Africa, or if he brings back some intermediate hosts, it will also cause Schistosomiasis haematobium to spread among people.

Gu Yanan immediately asked, "Has your son ever returned from Africa recently?" Or what did you bring back? ”

Uncle Zhang hesitated for a moment, as if he was thinking about something, and then shook his head after a while, "It's been two years since my son went to Africa, and because he was too busy with work, he didn't come back once in the middle, and he didn't send anything back." ”

I just thought there was a clue, but it turned out to be broken again.

People who went to Africa did not come back, nor did they send anything back, so this route of transmission can be ruled out.

After questioning Uncle Zhang, Gu Qingcen also ended his questioning of the patient.

Gu Yanan and Gu Qingcen met in the corridor outside the infectious disease ward, Gu Qingcen shook his head slightly, "There are no clues, the patients have lived in Hetang Village for a long time, and they have never been abroad, and they have not been to the epidemic area of Schistosoma ejastomy." ”

Gu Yanan muttered in his heart, didn't he guess wrong before? It's not Schistosoma haematobium infection, it's schistosomiasis re-appearing, but the symptoms are different from before, is this the case?

In either case, it is still necessary to go to Hetang Village to conduct on-site investigation and find the source of infection, and all the truth will be revealed.

"Brother Qingcen, let's go to Hetang Village."

——

Hetang Village.

Gu Qingcen drove his black SUV and took Gu Yanan to meet Lu Li and Wang Xiaoxiao, who were driving the CDC's on-site flow shunting car, at the entrance of Hetang Village.

Lu Li got out of the car and took out a few long-pole nets from the trunk of the on-site flow shunting car.

Wang Xiaoxiao was carrying the sampling box in her right hand, holding long rubber boots and plastic gloves in her left hand, and after seeing Gu Yanan and Gu Qingcen, she greeted loudly, "Sister Yanan, we really came to catch snails today?" ”

"Well, to be specific, it should be in the lotus pond around Hetang Village, collect all kinds of freshwater snails, and see if there are any snails or blister snails in them."

"The snail, I know, is the intermediate host of Schistosoma japonicum, and it is long and slender, with threads, like iron nails, but I have never seen a snail."

Gu Yanan explained, "The blister snail is relatively small, the head is oval, a bit like a blister, and some have a little bit of light red, in short, it is different from the common freshwater snails on our side. ”

The lotus ponds in Lotus Pond Village are one after another, as far as the eye can see.

Gu Yanan and his entourage of 4 people first used fishing nets to salvage in the silt on the bank of the lotus pond.

The ones that are fished out of the mud are basically freshwater snails that are common in Lianhai City.

The snail is not an intermediate host for schistosomiasis, and it is not the object they are looking for in this investigation.

There are small wooden boats used by the villagers to raise fish on the shore of the lotus pond, and in order to go to the center of the lotus pond to collect water samples and freshwater snails, the four people decided to borrow a small wooden boat from the villagers.

Gu Yanan and Gu Qingcen took a wooden boat, and Lu Li and Wang Xiaoxiao took another wooden boat.

The wooden boat was very small, two people sat at one end, and the sampling box and fishing net were placed in the middle, and it was already full.

Gu Qingcen rowed to the center of the lotus pond, Gu Yanan opened the sampling box and collected the surface water in the center of the lotus pond with a water sample bag, and then fished the net to start fishing for freshwater snails under the silt at the bottom of the lotus pond.

The fishing net stirs up the silt at the bottom of the pond, and the water becomes muddy, and strings of bubbles emerge from the water.

On Lu Li and Wang Xiaoxiao's side, it was Wang Xiaoxiao rowing, and Lu Li collecting water samples and freshwater snails.

The water on the shore of the lotus pond is not deep, but when it reaches the center of the lotus pond, the water potential is deeper, there are more than one person high, and the freshwater snails salvaged are not more than those on the shore.

After more than an hour, four people rowed back to the shore in a small boat, gathered together, and packed the freshwater snails fished from different locations into different sampling bags.

While sorting out these freshwater snails with silt, the four of them discussed the harvest of entering the lotus pond this time.

Wang Xiaoxiao looked through one of the bags, pointed to a small oval freshwater snail and asked Gu Yanan, "Sister Yanan, what kind of freshwater snail is this?" Is it a blister snail? But it is relatively large, and it does not have a reddish body. ”

"This is an ordinary mud snail, some people also eat this, and there are various flavors of canned mud snails for sale in supermarkets."

"I said it's so familiar, it turned out to be a mud snail, but unfortunately there are no snails and blister snails in so many field snails and mud snails, this time it won't be in vain, maybe the source of infection is not in this lotus pond."

Lu Li: "Even if the source of infection is not in the lotus pond, we are not here in vain, at least it proves that there is no source of infection here, we can go to the lotus pond in other areas to find it, if it really doesn't work, we can go to the farther river to find it, maybe the villagers have gone to the river a little farther away to swim." ”

Gu Yanan remembered that when he asked Uncle Zhang in the hospital before, he said that there had been people dead in his lotus pond, and the deceased also had symptoms of blood in the urine before his death, and because the water quality of his lotus pond was clearer than that of other homes, many children would go to swim secretly in the summer, and the infected little boy Da Niu had been to Uncle Zhang's lotus pond.

Uncle Zhang's lotus pond should be the focus of the investigation.

"Let's go, go to the lotus pond of Uncle Zhang's house and continue to investigate."

After inquiring all the way, I finally found the lotus pond of Uncle Zhang's house among the many lotus ponds.

Aunt Zhang and Uncle Zhang are all in the hospital, and the door of the five large tiled houses they live in is closed, and in front of the courtyard is a large lotus pond of his house, and there are two small wooden boats on the side of the lotus pond, tied to the shore with ropes.

Gu Qingcen untied the rope and jumped onto the boat first, then took Gu Yanan's hand and pulled her onto the boat.

The two rowed a small wooden boat to the center of the lotus pond, and Gu Yanan collected the surface water of the lotus pond according to the previous operation, and continued to salvage freshwater snails with fishing nets.

The freshwater snails caught this time are a little different.

A pile of field snails and mud snails is interspersed with a few small small reddish snails.