The person in charge of the hotel was asked by Gu Yanan, and felt a tremor in his heart, but he still nodded truthfully, "Yes, those two are cleaning staff, and they have worked in our hotel for many years, if there is a problem with our hotel, then the two of them should have been sick a long time ago, how could it be so coincidental that they were sick after two days of this academic conference?" ”

The person in charge of the hotel deliberately blamed the cause of the infectious disease on the academic conference staff, "The participants of this academic conference come from all over the country, maybe who brought the infectious disease." ”

Gu Yanan didn't explain, but stared at the hall on the first floor carefully.

In addition to several central air-conditioning outlets, there are also two temporary drinking water facilities that provide free drinking water to passing guests in the lobby, although these places have been sampled last time and the test results have not found Legionella.

Gu Yanan's gaze fell on the fountain in the center of the hall.

The fountain pool is round, more than four meters wide in diameter, with a spring gushing out in the center, a few small goldfish and aquatic plants in the spring pool, and a few reeds at the edge of the pool.

Constant water vapor rises from the fountain.

Seeing Gu Yanan staring at the fountain, the person in charge of the hotel was busy explaining, "This fountain has just been rebuilt, and the special designers and installers hired just started using it a week ago." ”

A fountain that has just been remodeled?

The time of the fountain renovation is almost the same as the time when the guests became ill.

Gu Yanan asked Lu Li and Wang Xiaoxiao, who were following behind him, "Did you take any water samples from the fountain last time?" ”

Lu Li and Wang Xiaoxiao looked at each other.

Wang Xiaoxiao: "I am only responsible for collecting tap water samples and direct drinking water collection. ”

Lu Li: "I am responsible for the air outlets and condensate towers of the central air conditioner, as well as the showers on each floor. ”

That is, no one took a sample of the fountain water last time.

Gu Yanan took matters into his own hands, first turning off the power of the fountain, and after the fountain was still, Gu Yanan entered the fountain pool wearing a protective suit.

A portion of the water around the fountain pool was collected, and then the fountain pool was entered into the center of the fountain pool and the fountain pool sprinkler device was turned on.

There is a thin layer of mucous membrane-like material inside the fountain pipes, which is a biofilm formed by the long-term growth of microorganisms.

The biofilm formed by microorganisms and water samples from the pipes were collected and placed in a sampling box.

The person in charge of the hotel watched Gu Yanan busy working in the fountain pool, picking some things out of each place, and couldn't help but ask outside the fountain pool: "Is there a problem with this fountain?" ”

"It's still uncertain, we have to wait for the test results, but just now I saw that the pipes of the fountain are not new, and it will take at least half a month for such a biofilm to grow."

The person in charge of the hotel explained, "This fountain is indeed not new, because the old fountain was a little old and demolished, this set of fountain facilities is dismantled from the Rose River Park, and the water in the fountain pool is also drawn from the Rose River, because the Rose River is the mother river of our Lianhai City, and the fountain made with the water of the Mother River is also a major feature of our hotel." ”

"The water of the Rose River? This is not tap water?! ”

The person in charge of the hotel smiled and continued to explain, "Isn't the tap water we drink from the Rose River? ”

"That's different, the Rose River is the source of tap water, it is after a series of disinfection treatments before entering every household, like this kind of indoor fountain is generally used tap water, and copper sulfate and other bacteriostatic agents are added to it, depending on the color of the fountain pool water in your hotel, there should be no copper sulfate, right?"

The person in charge of the hotel looked embarrassed, "There shouldn't be, but we have people every day who come to clean the fountain pool." ”

"Who's going to clean it?"

"The two cleaners are the two hospitalized ......"

Speaking of this, the person in charge of the hotel stopped abruptly, and now even he felt in his heart that the two cleaners among the hotel employees were hospitalized, as if they had nothing to do with this fountain pool.

——

Lianhai Center for Disease Control and Prevention, Emergency Office.

Lu Li took the test report of the fountain water sample to Gu Yanan.

High concentrations of Legionella bacteria were detected in fountain pool water.

The cause of the outbreak of Legionnaires' disease in the Jinshan Bay Hotel has been investigated.

The old fountain in the lobby on the first floor of the hotel has been renovated, and a batch of new fountain equipment has been replaced from the Rose River Park, and water is taken from the Rose River as the water for the hotel fountain.

The pipes of the replaced fountain equipment contain Legionella bacteria, and the water from the Rose River also contains a large number of protozoan microorganisms, which promote the growth of Legionella bacteria in the fountain pool water.

The Legionella bacteria in the fountain pool water form an aerosol with the spray of the fountain and spread throughout the hotel.

Many of the participants in the conference were infected because they were close to the fountain on the first floor and inhaled aerosols containing Legionella bacteria.

The two cleaners who were in charge of cleaning the fountain were also infected with Legionella.

The guest of room 6022 had a low immunity because of the underlying metabolic disease diabetes, and when he checked into the hotel, he had watched the fountain in the lobby on the first floor for 5 minutes, inhaled a large amount of aerosols containing Legionella, became ill the next night, coughed up a lot of blood, and died in the room, and was later found by the police and brought back to the forensic department of the police station for autopsy, and was detected with pneumonia, and a large number of Legionella bacteria were found in the lungs.

Dai Qixian and Zhang Li, who attended the academic conference, discussed things on a bench by the fountain pool for half an hour, inhaled a large amount of aerosols containing Legionella bacteria, and became ill in the morning and afternoon of the second day of the conference, respectively.

After the Legionella was detected, the doctor changed the type of antibiotic in time and treated the patient with a combination of azithromycin, levofloxacin and rifampicin, and the Legionella infection was controlled, no new cases were reported, and the patient was discharged one after another.

After identifying the pathogen and source of infection, and disinfecting the fountain and the entire building, Golden Bay Hotel lifted the lockdown and reopened for business.

——

After writing a summary report on the Legionella outbreak, Gu Yanan and Nan Hanfei met at a café.

The café is located on the top floor of the Pearl Building, the tallest building in Lianhai City.

Here, Nan Hanfei once brought Gu Yanan to come once.

The last time I visited, there wasn't a single customer at the café on the top floor, but this time there were seven or eight customers, scattered across the remote seats.

Because it was the first time Gu Yanan officially asked Nan Hanfei to meet, Nan Hanfei deliberately dressed up before going out, wearing a suit and leather shoes, which was very formal.

The two sat at the elegant wooden table in the open-air café on the top floor, and Nan Hanfei smiled, "Yanan, why did you remember to ask me out for coffee today, did you want me to help explain the matter between us to Aunt Gu?" ”

Gu Yanan shook his head, "No, but it has something to do with this matter, I thought about it for a long time, and I felt that I let you pretend to be my boyfriend and cheat on my parents from the beginning of the matter, and it also affected you, and I asked you out today to tell you that this matter of pretending to be my boyfriend is over, thank you." ”

Nan Hanfei's heart seemed to be frozen suddenly, and his smile froze for a moment, but quickly returned to normal, "You're welcome, you can't just talk about it, answering me a question is your thank you." ”

"What's the problem?"

"Who is Gu Qingcen?"

This time it was Gu Yanan's turn to face stiffen for a moment, "Why do you want to know?" ”

"Last time we were trapped in the ancient tomb, on the line of life and death, you had a fever and whispered in your dreams, a name that can make you cry in your dreams, either you owe you a lot of money, or it is a knot in your heart, I am curious."

Gu Yanan pursed her lips, and after a short silence, she said lightly: "Gu Qingcen, my former childhood sweetheart, doesn't owe me money, but owes me someone to explain." ”

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