Gu Yanan asked each new patient in the emergency hall about some basic information.

After a round of inquiry, it was found that the onset time of the participants in the academic conference was concentrated from this morning to noon, and they all began to feel unwell after staying at the Golden Bay Hotel for about 36 hours, and the initial symptoms were like a cold, and taking antiviral cold medicine was ineffective.

An ordinary tenant of Jinshawan Hotel checked in at noon yesterday, and after sleeping for one night, he had fever, vomiting and cough this morning, and the situation worsened at noon, and he couldn't get up in the afternoon, so he dialed 120.

Gu Yanan also focused on asking two staff members who were sent to the Golden Bay Hotel, both of whom were cleaning staff of the hotel, mainly responsible for the cleaning of the hall on the first floor, who began to have cold symptoms yesterday and aggravated today, and saw many people in the hotel being picked up by ambulances in the afternoon, and the two felt that their symptoms were similar to those of the participants, so they followed the ambulance to the hospital.

Gu Yanan strung together all kinds of information in his mind.

The patients were all in the Golden Bay Hotel, and the initial symptoms were similar to those of a cold, with elevated white blood cells and pneumonia, and the course of the disease progressed rapidly.

In winter, the Golden Bay Hotel is heated by central air conditioning......

Gu Yanan remembered a classic epidemic case abroad, one winter, the veterans conference of country M, after the meeting, a large number of participants had symptoms of pneumonia, and the doctors could not find the causative agent, but named the patient's symptoms "Legionnaires' disease", and later, epidemiologists isolated a new bacterium from the patient's specimen and named it "Legionella", and Legionella was also detected in the condensate of the central air conditioning of the conference building.

The situation at the Golden Bay Hotel this time is very similar to the epidemic case in country M.

Relatively closed buildings in winter, dense personnel environment.

Similar external conditions, similar patient symptoms, and likely similar pathogens.

Gu Yanan immediately called Lu Li, who was in the CDC laboratory, "The patients at the Golden Bay Hotel are focused on testing for Legionella bacteria. ”

"Roger!"

If the pathogen can be identified early, more lives could be saved.

Gu Yanan waited for the results of Lu Li's experiment while continuing to do the flow survey in the hospital.

While talking to a hotel manager who came to the hospital with an ambulance, Gu Yanan received a call from Nan Hanfei.

"Yanan, the autopsy report of the deceased in room 6022 of the Golden Bay Hotel has come out, and the cause of death is respiratory failure caused by pneumonia."

It was pneumonia and respiratory failure, and the cause of death was the same as Dai Qixian's.

Gu Yanan felt that the deceased in room 6022 should be the first case of the outbreak at the Golden Bay Hotel, and his specimen test results and flow survey results were very important.

"Team South, I want a specimen of the deceased, he may be related to an outbreak that we are dealing with."

"Yes, I'll send someone to send you the specimen, and there's another piece of news that should be helpful to you."

"What's the news?"

"The deceased in room 6022 had diabetes before his death."

"Well, underlying metabolic disease can lead to a decrease in the deceased's immunity before death, making them more susceptible to contracting diseases."

"I had the medical examiner department test the deceased's lung tissue for pathogens, and Legionella pneumophila was found."

"Legionella?!"

As Gu Yanan speculated, it was indeed a Legionella infection.

Nan Hanfei seemed to be deliberately explaining: "The forensic department has increased its funds, and a batch of reagents has just arrived, and there is just a test for Legionella bacteria, and as soon as the results come out, I will call to tell you, how is it?" Is this news still useful? ”

"Very useful, I'm going to do Legionella flow on my side, thank you."

Gu Yanan hurriedly hung up the phone and began to arrange for people to start inspecting the Golden Bay Hotel.

When arranging the personnel, Lu Li called, "Sister Yanan, Legionella was detected in the sputum specimen of the patient just sent, and the concentration is very high. ”

Laboratory tests confirmed that the outbreak at the Golden Bay Hotel was indeed an infection caused by Legionella.

Legionella bacteria live in water and especially prefer to grow in condensate from air conditioners, water pipes, and water supply tanks.

Gao Fei and Wang Xiaoxiao were arranged to go to the Golden Bay Hotel to check and sample, focusing on collecting samples of the air outlets of the central air conditioner, the condensate tower, the tap water, and the shower water in the rooms of the sick people.

Showing the work card, the hotel staff was very cooperative, and all kinds of water samples were quickly collected and sent back to the disease control laboratory.

Legionella was purposefully tested, and the results came back quickly.

What made Gu Yanan wonder was that none of the samples taken from the Golden Bay Hotel had detected Legionella bacteria.

Through the investigation of the patient, Gu Yanan determined that the source of infection was in the Golden Bay Hotel.

Legionella was not detected in various water samples, what is the problem?

Ruling out the problem of detection methods, that is the problem of sampling.

No samples of the environment in which Legionella grows were collected.

Gu Yanan left the hospital and went to the Golden Bay Hotel for a second sampling.

This time with Gu Yanan are Gao Fei and Wang Xiaoxiao.

Due to the confirmed outbreak of Legionella infection in the Golden Bay Hotel, the hotel was temporarily closed.

Entering the Golden Bay Hotel again, the person in charge of the hotel accompanied him, his face was depressed, and asked Gu Yanan, "Director Gu, our hotel is the best hotel in Lianhai City, five-star, no matter which aspect is the best in the industry, the environmental sanitation in the hotel is nothing to say, last time you disease control came to check our water quality, no problem, there is also a central air-conditioning system, our hotel is looking for a professional cleaning company to clean regularly, you see this is our cleaning record." ”

The person in charge of the hotel took out a booklet and respectfully handed it to Gu Yanan.

Gu Yanan flipped through it casually, and there was indeed a regular cleaning record, and the qualification of the cleaning company was attached to it.

Gu Yanan didn't make any comments, just returned the pamphlet to the person in charge.

The person in charge of the hotel couldn't guess the thoughts of the beautiful director of the CDC Emergency Response Office in front of him, so he could only express his opinion on the side, "Director Gu, do you say there is such a possibility, this infectious disease is not due to the environment of our hotel, it may be that the recent guests have been infected to other travelers, you see that we have placed the previous guests in accordance with the requirements of the health department to a unified location for medical examination, and when we disinfect the hotel environment, can we lift the ban and open normally?" ”

It turned out that the person in charge of the hotel was still thinking about making money through normal business.

Gu Yanan was not polite, and directly told him that it was very important, "Legionella infection has caused two deaths and more than 20 infections, and the ban cannot be lifted until the source of infection is found, and besides, your hotel employees are also infected, and the hotel is prohibited from finding the source of infection, which is responsible for everyone." ”

The person in charge of the hotel was very helpless, "The two infected employees of our hotel are only responsible for cleaning the lobby on the first floor, and the other employees are fine, and the patients this time are basically people who participated in the academic conference, maybe the source of infection is brought by this academic conference." ”

The person in charge of the hotel looked at Gu Yanan as he spoke, his eyes were questioning, and he thought, you are also here to attend an academic conference, is it related to this infectious disease, you have infectious diseases every day, maybe you have a virus on your body.

Although he thought so, the person in charge of the hotel did not dare to say so, and only subconsciously took a step back.

Gu Yanan ignored his movements, but was reminded by his words.

"You just said that the two sick staff members are responsible for cleaning the hall on the first floor?"

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