In the dim light, more than two dozen sheep huddled in the sheepfold to rest.

The woman introduced Gu Yanan and his entourage, "There are rams and ewes in this sheepfold, and there are milk-producing ewes and lambs when I first came. ”

The door of the sheepfold was opened, and several people entered the sheepfold.

Without a flashlight, everyone uses the flashlight function of the mobile phone to illuminate the environment, check the environment in the sheepfold, and carefully examine the sheep, if the disease of the archery team and the breeder is really related to these sheep, then the sheep will definitely show corresponding symptoms.

There is also a fence in the south corner of the large sheepfold to separate a small area, and the bedding below is more refined and fodder, which is used to raise the new ewes and lambs.

Gu Yanan and Nan Hanfei entered this little sheepfold, and there were a total of 4 ewes and 3 lambs in it.

Gu Yanan carefully inspected each ewe with the flashlight that came with her mobile phone, and when she found the second one, she found that there were many black spots the size of black soybeans on the sheep.

These black spots are concentrated in the dense areas of the wool and are hidden under the wool and are difficult to spot without careful inspection.

"Ticks?!"

"Grass crawler?!"

Gu Yanan and Nan Hanfei were shocked at the same time.

Everyone else was drawn to it.

Seeing the ticks sucking blood on the sheep's body, several people felt their scalps tingle.

"There are so many ticks on sheep!"

"Tick-borne encephalitis!" Several people spoke in unison.

Tick-borne encephalitis, also known as forest encephalitis, is the tick-borne encephalitis virus in the genus Flavivirus, ticks are the vectors, and the main symptoms are convex high fever, headache, consciousness disorder, meningeal irritation, and paralysis in clinical practice.

Forest encephalitis is regional, mainly distributed in the northeast, northwest and other primeval forest areas in China.

Forest encephalitis was not taken into account when several people discussed the cause of the patient's illness in the past, mainly because there had never been an endemic case of forest encephalitis in Lianhai City.

However, it is now known that a new batch of goats has been introduced from the northeast in the villa, and this batch of goats is likely to come from the natural foci of forest encephalitis in the northeast primeval forest area.

To determine the specific source area of the goat, it is necessary to have a careful chat with the farmer, even if the specific origin of the goat is known, as for whether the goat and the tick in the goat, and the goat** contain forest encephalitis virus, laboratory testing is also required.

Next, several members of the CDC team split up.

Nan Hanfei took Zhou Lao and Gao Fei to ask the owner of the villa, Nan Hanfei helped, there was a police officer, and it was easier for the owner of the villa to explain in detail.

Gu Yanan took Xiao Chu to contact Jinping County Disease Control and Prevention, tracked the hospital where the archery team was located, sampled and tested the sick people, and sent people to Jinping Villa to investigate the health of the new sheep and the staff of the villa.

——

Day 2 at 8:30 a.m.

Section Chief Qian of the Jinping County Disease Control and Prevention Department personally led people to Jinping Villa, and under the guidance of Gu Yanan, collected blood, **, feces, and environmental samples from all the sheep around the sheepfold.

Raw goat milk and mutton products stored in the back cabinet of the villa were also collected.

In addition, blood tests were taken for the staff at the lodge and those who were visiting the lodge.

All the specimens were sent by the county CDC to the city CDC laboratory.

In the end, Gu Yanan asked Section Chief Qian, "Did the guinea pig and chicken bring it?" ”

"Bring, it just so happens that we Jinping County just built a biological industrial park a few years ago, which has a chicken farm for the supply of vaccine factories, specializing in raising SPF-level breeders, and a laboratory animal breeding base for the needs of experimental animals in major laboratories, or where will you let me go to find SPF-level mice and chickens for you in a short time?"

Section Chief Qian was proud of his ability to quickly respond to the city's CDC requirements, but asked curiously, "Director Gu, what do you want this chicken and guinea pig for?" ”

"Flow call."

"Huh? Flow Tune? Isn't it the three questions you once summarized about the soul: Where did it come from? Where to go? What environments and people have you been exposed to? Aren't both mice and chickens used in the lab? ”

"This time is different, I am worried that the goats from the primeval forest area in Northeast China may carry the forest encephalitis virus, although it has been introduced for a short time, it may also spread to the natural environment around Jinping Villa. I want to make sure if there is a natural foci here, and the old mice and chickens you brought are the test subjects to test whether a natural foci have been formed. ”

Section Chief Qian also has a wealth of experience in flow investigation, after Gu Yanan said this, he immediately clarified Gu Yanan's next approach, "You want to put these mice and chickens in the surrounding forest, let the ticks in the forest bite them, if this has formed a natural foci of forest encephalitis, then the ticks in the forest will carry the forest encephalitis virus, and the bitten mice and chickens will be infected, and then bring these mice and chickens back to the laboratory to test whether they contain forest encephalitis virus, and you can determine whether a natural foci have been formed here." ”

"yes, that's how it works."

"The primeval forests around Jinping Villa are all over the place, and the scale is very large, how many do you plan to distribute."

"It has not been long since the introduction of goats from the northeast, so they will be distributed within 2 kilometers around Jinping Villa, and if there are positive ones, they will continue to expand the range."

To release mice and chickens into the woods, you need to have a guide who is familiar with the local terrain.

Gu Yanan found the owner of the villa and borrowed from him a few villa workers who were familiar with the local terrain as guides.

Originally, I came to the villa for a weekend vacation, but suddenly encountered an epidemic, the entire emergency team took action, and the police team led by Nan Hanfei also actively helped, plus the personnel sent by Jinping County Disease Control and Prevention, everyone was divided into 8 groups, and under the leadership of the guide, the Jinping villa was the center of the march in 8 directions, and a mouse and a chicken were placed in cages at intervals.

A group of Gu Yanan, Nan Hanfei and Xiao Chu, plus a local guide, a team of 4 people set off from Jinping Villa and went all the way south into the primeval forest.

Everyone carried a few cages in their hands, and the cages contained mice and chickens, and the local guide was very curious, asking questions along the way, and Gu Yanan patiently explained.

Guide: "I didn't expect rats and chickens to be used like this, you scientists really think differently than ordinary people." Everyone be careful, the road here is very difficult to walk, put the cage here now, when will you come back to pick it up? ”

"Tomorrow."

"I'm going to spend the night, but don't worry, I think this cage is very strong, rats and chickens won't be eaten by animals in the woods, and there are usually no people here who come here, let alone steal them."

Soon walked 2 kilometers, and the mice and chickens in the hands of several people were also placed, and on the way back, Nan Hanfei, who had always been light and healthy, was left behind.

Gu Yanan felt abnormal, thinking that maybe Nan Hanfei had been tired recently, and was about to give him a hand, but found that he was pale and had cold sweat on his head.

Ordinary exertion does not appear this symptom, Nan Hanfei is sick?

"Han Fei, what's wrong with you?" Gu Yanan held him up and asked worriedly.

The moment the two touched, Nan Hanfei suddenly fell forward and fell on Gu Yanan's shoulder, and the person was already unconscious.