The guest house is located next to the Yuanyang CDC, and is also close to the Third Hospital, which admits patients with human-Streptococcus suis, and the entire team of experts lives here.

Nan Zhiqiao opened a separate room for Ye Zhenzhen, put down the salute, and the sky was already dark.

After having dinner in the guest house, Nan Zhiqiao took Ye Zhenzhen to the CDC of Yuanyang City next door to check the information.

Two weeks have passed since the outbreak was discovered, the first week was a case of acute illness and high mortality, and the second week was the arrival of provincial and national expert groups, and the cause was quickly identified.

Now, although the pathogen that caused the epidemic has been found, the cause of the outbreak in pigs and humans is still unclear, and various experts have their own opinions.

Among them, an expert from the Ministry of Agriculture believes that the main cause of the outbreak of Streptococcus suis in pigs in Yuanyang City is the high temperature and humidity of the weather, coupled with the scattered breeding of farmers and the unsanitary pig pen, in short, it is environmental factors that lead to the outbreak of the epidemic.

Based on this, some experts speculate that it is entirely possible that the Streptococcus suis outbreak may occur in other provinces and cities with similar environments, because for provinces and cities with similar climate and disease conditions, it is also necessary to do a good job in prevention and control.

Nan Zhiqiao has not expressed his opinion, in addition to asking about the condition, checking the information, that is, going to the scene to investigate, and at the same time, he also sent the newly isolated strain of Streptococcus suis to Guojing Medical Center for sequence analysis.

Ye Zhenzhen came this time and brought the results of sequence analysis with her.

On the computer of the Yuanyang City CDC, Nan Zhiqiao looked at the results of the sequence analysis and frowned slightly.

Every time Nan Zhiqiao has this expression, he says that he has found something wrong.

Ye Zhenzhen also stared at the sequence analysis chart on the computer screen, and after a while, she said, "Senior Nan, did you also find out?"

Nan Zhiqiao nodded, "Well, the sequence of the strain isolated from the patient of Yuan Yang is exactly the same as the sequence of the strain isolated from the patient of Baiyun Ranch. ”

"What does this mean?" Nan Zhiqiao asked deliberately rhetorically.

Ye Zhenzhen: "This shows that the same strain caused these two epidemics!"

Both of them were silent at the same time, both analyzing the reason in their hearts.

Ye Zhenzhen was the first to ask: "There are nearly 2,000 kilometers from Beijing to here, the same time, different places, how are the two epidemics connected?"

Nan Zhiqiao didn't answer directly, but tapped his finger on a stack of materials on the table, "It's up to us to find clues." ”

With a thick stack of materials, Ye Zhenzhen moved the information in front of her with both hands and asked, "These are all the information on human-Streptococcus suis this time?"

"Well, most of them are case data, as well as the flow data of the on-site investigation in the past few days. ”

Ye Zhenzhen flipped through it from the beginning, and the first few were all death case files, the patient's admission process, clinical symptoms, treatment records, and all the contents were very detailed.

Among them, the case files of the patients who died early - Shi Baocheng and Shi Guohua attracted Ye Zhenzhen's attention.

According to the case files of the two people, at noon on July 4, Shi Baocheng was admitted to the hospital with symptoms of high fever, ecchymosis all over the body, shock, anti-shock treatment was ineffective, and he died that night. In the "occupation" column of Shi Baocheng's case file, it is written "farmer".

Shi Guohua was admitted to the hospital on the evening of July 4, with the same symptoms as Shi Baocheng, high fever, ecchymosis all over the body, shock, and the same anti-shock treatment was ineffective, and he died in the early morning of the second day. In the "occupation" column of Shi Guohua's case file, it is written as "farmer".

Looking at the home addresses of the two again, they are both in Stone Village, Songlin Town, Yanfei District, Yuanyang City, in the same village, adjacent house numbers, and the two are neighbors.

Cluster cases like Shi Baocheng and Shi Guohua generally have the same disease triggers, and from this case, the investigation of the disease will be found.

Ye Zhenzhen took out the cases of Shi Baocheng and Shi Guohua, and asked Nan Zhiqiao beside her, "Senior Nan, have you done the investigation of these two cases?"

Nan Zhiqiao took the case of the two of them, glanced at it, nodded and said, "I just went there yesterday, and I followed up on the flow of Shi Baocheng's family, and the flow information is here." ”

Nan Zhiqiao pulled out a copy from the stack of materials, "This is the flow information of Stone Village. ”

"The entire Stone Village's materials are here?"

"Well, there are three people who have fallen ill among the villagers of Stone Village, in addition to Shi Baocheng and Shi Guohua, who have died, and Xiao Fang, who is being hospitalized, she is Shi Guohua's wife, the three of them have become ill, Xiao Fang's symptoms are slightly mild, and after treatment, he has been transferred from the intensive care unit to the general ward. Here are some of the materials you learned during your visit to Stone Village. ”

Ye Zhenzhen began to look through the information of the Stone Village, and Nan Zhiqiao dictated the entire flow process on the side.

In Stone Village, Songlin Town, Yanfei District, Yuanyang City, most of the families in the village are surnamed Shi, and every family has a bit of a relationship with relatives. Only a few hundred meters away from Shi Baocheng's house, walking through a dirt slope, is Shi Guohua's house, Shi Baocheng is helping his family kill pigs and contracted swine streptococcal disease.

According to Shi Guohua's wife, Xiao Fang, what happened was as follows: Shi Guohua's family had two small pig farms, one in the mountains and the other in his backyard, which raised four big pigs and six small pigs.

At about five o'clock in the morning of July 3, the sky was still bright, Xiao Fang got up as usual to feed the pigs, how to shout, one of the big pigs just didn't move, and he couldn't beat it with a wooden stick.

After a closer look, the pig had already died, Xiao Fang hurriedly called her husband Shi Guohua up, and the couple discussed it and asked their neighbor Shi Baocheng to help kill the pig.

Shi Baocheng's pig killing skills are very skilled, but within two hours, the pigs were killed and cleaned, the internal organs were thrown away, and the pork was sold to migrant workers in a nearby brick factory at a low price, and before ten o'clock in the morning, all the sick and dead pork was sold out.

Xiao Fang then sold the other three big pigs and six small pigs to the pig dealers, and before selling, Xiao Fang also specially found someone to give the pig an epidemic prevention shot.

On the afternoon of the day when the pig was killed, Shi Baocheng already felt the indescribable discomfort in his body, thinking it was a cold, but he didn't expect that the next morning, he couldn't get out of bed in pain.

Shi Baocheng's wife, Li Hua, worked in a nearby brick factory, and in the morning, a fellow villager suddenly came to tell Li Hua that Shi Baocheng, who was alone at home, rolled in pain, fell from the bed to the ground several times, and his face was pale.

After Li Hua went home, he found a neighbor's motorcycle and wanted to send Shi Baocheng to the hospital, but Shi Baocheng, who was paralyzed, could no longer support the motorcycle. Subsequently, Li Hua called the ambulance of the Third People's Hospital of Yuanyang City, and as soon as he was sent to the ambulance, Shi Baocheng put on an oxygen mask, and that night, Shi Baocheng died of ineffective rescue.

After Shi Baocheng became ill and died, Shi Guohua also developed symptoms, similar to Shi Baocheng's symptoms, with an acute onset, and when the ambulance was sent to the hospital, the rescue was ineffective and died, and the time of death was only four hours different from Shi Baocheng's time of death.