Nan Zhiqiao even has such an experience!

Ye Zhenzhen and Xiao Gao both looked at Nan Zhiqiao with admiration, Nan Zhiqiao had long been accustomed to this kind of look from others, and calmly ordered: "Xiao Gao stays in the hospital and continues to follow up on the newly admitted people - Streptococcus suis cases, Teacher Xiao Ye and I will go to the city CDC to test this batch of specimens." ”

——

In the laboratory of the laboratory of the Yuanyang Municipal Center for Disease Control and Prevention, Nan Zhiqiao, Ye Zhenzhen and two staff members of the local Center for Disease Control and Prevention worked together, and the preliminary test results came out quickly.

In the dead pigs of Lao Jiangtou and Shi Guohua's Banshan pig farm, Streptococcus suis was detected.

In the mid-level pig farm, the cause of the sudden death of humans and pigs was found to be affected by the human-swine streptococcus epidemic.

Due to the limitations of the experimental conditions of the local Municipal Center for Disease Control and Prevention, Nan Zhiqiao sent the isolated strains to the Microbiology Forensic Laboratory of Beijing Guojing Medical Center, where Li Guoyi was responsible for the gene sequencing and analysis of the strains.

The cause was found, but Nan Zhiqiao still had questions in his heart, most of the dead pigs in the mid-mountain pig farm were wild boars caught from the deep mountains, where did the first Streptococcus suis come from?

Thinking of the people-Streptococcus suis epidemic in Baiyun Ranch a few days ago, there was also the sudden death of wild boars, and when the wild boars were buried, several people who were pricked by wild boar hair and injured their hands were sick.

The rancher of Baiyun Ranch once said that the wild boar was bought from Sichuan, and that the epidemic in Baiyun Ranch had anything to do with the epidemic here?

In addition, before Zhen Zhen came here, she had compared the strains isolated from the patients in Baiyun Ranch with the strains isolated from the Sichuan people-Streptococcus suis patients, and the homology between the two was extremely high, which shows from the molecular level that the two epidemics thousands of miles apart have a certain relationship.

——

In the laboratory of the Municipal Center for Disease Control and Prevention, after the testing of various specimens was processed, the strain analysis sent to the Guojing Medical Center still had a period of time to come out.

The Third Hospital is the hospital where the human-Streptococcus suis outbreak was treated, and it is also the hospital where Shi Guohua's wife, Xiao Fang, has been living.

Nan Zhiqiao talked to Xiao Fang again, and this time the topic of the conversation was the source of wild boars in the mid-mountain pig farm.

Xiao Fang made everything clear, it turned out that only part of the wild boars that Shi Guohua caught from the old forest of Jingshan were raised in his own mid-mountain pig farm, and more were sold to other places, some buyers were to eat pure wild pork, and some buyers were like Baiyun ranch owners, in order to breed domestic pigs.

Nan Zhiqiao asked Xiao Fang if he had sold the wild boars to Baiyun Ranch, Xiao Fang said that Shi Guohua was responsible for these things, and he usually didn't care about these things, but now that Shi Guohua is dead, he doesn't know where the wild boars were sold before.

At one point, the conversation was at a bottleneck.

Nan Zhiqiao thought that Shi Guohua's mid-mountain pig farm was not small in scale, and there would definitely be records for the entry and exit of various projects.

reminded Xiao Fang like this, Xiao Fang really remembered that there was indeed an account book at home, which was usually recorded by Shi Guohua and placed in the bedroom drawer.

Sent someone to Shi Guohua's house to get the account book, carefully checked, and sure enough, there were transaction records of wild boars, which recorded in detail the number of wild boar heads that Shi Guohua had caught from the old forest of Jingshan in the past two years, as well as where they were sold and the transaction price, etc., which contained transaction records with Baiyun Ranch.

There are two transaction records with Baiyun Ranch, the earliest one was half a year ago, and the most recent one was a month ago.

Soon, Li Guoyi's side also fed back the results of sequencing analysis, and as expected, the sequence of streptococcus strains isolated from wild boars and old ginger heads in the mid-mountain pig farm was consistent with the sequence of the strains isolated from the patients in Baiyun Ranch.

After checking this, the cause, transmission and epidemic trend of this human-swine streptococcus epidemic have been basically clear.

Because Shi Guohua sold wild boars that had not been quarantined, Streptococcus suis was transmitted from the wild boars in the old forest of Jingshan to Baiyun Ranch, causing an epidemic in Baiyun Ranch, and at the same time, the wild boars in the Banshan Pig Farm further spread the epidemic in the vicinity by breeding with other domestic pigs, which is why Baiyun Ranch and Yuanyang City, which are thousands of miles apart, will have an outbreak of human-swine streptococcus at the same time.

Based on this theory, Nan Zhiqiao suggested tracking the whereabouts of the wild boars sold by Shi Guohua, monitoring the epidemic situation in the place of purchase, and increasing the publicity of epidemic prevention and control.

Of course, at the same time as Nan Zhiqiao put forward his opinions, some people in the expert group also suggested that the epidemic in Sichuan may only be caused by the fact that there are many retail pig breeders in Yuanyang, high feeding density and poor sanitary conditions.

However, in the following week, someone from other provinces also reported the outbreak of Streptococcus suis, and the place where the report happened to coincide with the place where Shi Guohua sold wild boars, which also indirectly confirmed the correctness of Nan Zhiqiao's theory.

A complete investigation of the flow of diseases has found out all kinds of useful information, and the next treatment of the epidemic is much simpler, controlling and eliminating the source of infection, blocking the transmission route, and treating the patient...... Everything is carried out in an orderly manner in accordance with the requirements of epidemic prevention.

——

After dealing with the epidemic, Nan Zhiqiao, Ye Zhenzhen and Gao Fushan returned to Beijing.

For this kind of disease control mission business trip, Nan Zhiqiao has long been accustomed to it, Ye Zhenzhen has also experienced a few times, and I don't feel anything, Gao Fushan is the first time on a business trip, after coming back, after two or three days, he is still in a state of excitement, in the interval of the experiment, everyone will talk about the experience in Sichuan.

At first, the students in the experimental group were all interested in listening, but after listening to it twice, they were all interested, and only Yang Fei and Ma Hui, who had entered the experimental group in the same batch as Gao Fushan, were still patient.

Yang Fei was very envious of this opportunity to go on a business trip, and when chatting privately, he mentioned it in front of Ye Zhenzhen intentionally or unintentionally.

Ye Zhenzhen's mind was clear, and when she heard Yang Fei's words, she immediately understood what he meant, and comforted him with a smile: "This kind of disease control task is often there, if you want to go, you can directly mention it to Teacher Nan." ”

Yang Fei excitedly asked, "Is it okay?"

"Well, Teacher Nan has to go out for disease control tasks no less than five times a year, and there are some regular supervision, and every time he goes out, he will take one or two students, which is also an opportunity for students to exercise. ”

The students all came to their senses, and gathered around Ye Zhenzhen and asked, "There is still a chance to take two students, when is Teacher Nan's next business trip?"

Ye Zhenzhen thought for a while and said, "Before the eleventh holiday, Teacher Nan will go to Huludao in the northeast to collect wild mouse books, which will take more than two weeks. ”

The students who gathered around her immediately raised their hands to indicate that they wanted to participate.

"Huludao in the northeast, it's a good place, I want to go. ”

"I want to go too. ”

"I want to, too. ”

……