When I'm on the night shift, all the department heads can't sleep.

The second batch of photos returned from the local authorities arrived at the administration building at 12:12.

The low cabinet in room 407 also has a locked drawer.

The local police contacted a locksmith to come to the scene. After verifying the apartment number and recording the unlocking process, they opened the drawer in front of the local staff and property management personnel.

Inside were several brown paper envelopes, one of which was labeled "Temporary Staff Settlement," which corresponded to the four names on the staff meal collection record.

Cheng Hao, Fang Cheng, Liu Chunmei, Zhao Bo.

The settlement sheet includes ID card number, receiving account, and mobile phone number, with the working hours for two events noted for each person.

Cheng Hao, 32 years old, signed in from 6:30 a.m. to 7:40 p.m. His job title was on-site coordination; the other three were responsible for registration, distributing event bags and arranging materials, respectively.

The screenshot from the venue's surveillance camera was quickly appended to the side.

The young man wearing glasses checked the sign-in sheet at the entrance of the morning session, and then followed Zhou Jian to count the event bags in the afternoon. He was also the one who opened the door when Wu Qingfeng delivered the file box to Room 407.

Song Lan reported Cheng Hao's name separately to the local authorities: "This person is in both games, check his current location first. Contact the remaining three as well, don't split it into four groups."

As soon as the numbers following the four names were completed, two lines of prompts appeared at the edge of Lin Ye's field of vision.

[Risk Area: The person has been located, but recent activities are still not closed off]

[Key gaps: current symptoms, medical visits on the day, and time spent in public areas]

Lin Ye looked at Song Lan: "When you contact her, ask if she has been feeling unwell in the past few days, and whether she has been to a clinic, pharmacy, or hospital today. Also ask where she is and what time she arrived."

Song Lan provided these supplies to the local area.

Ma Hao arranged the names of the four people into the same form, leaving a column for each of their current symptoms, the day they sought medical treatment, and the time of arrival. He would fill in the information directly after each call was connected.

The receiving unit and receipt number are also provided on the far right of the table to avoid mixing up the four off-site routes.

Several disease control personnel made separate calls.

Fang Cheng was at home, Liu Chunmei was at a vegetable shop near her residence, and Zhao Bo was on duty at the Chengbei warehouse. After receiving the call, all three of them stopped what they were doing as instructed and waited for the local personnel to come to their homes.

When Fang Cheng answered the phone, he thought someone was impersonating the CDC and asked for his workplace and name twice. He only believed it when a street staff member called back using the community registration phone number.

He had arranged to have someone fix the air conditioner in the afternoon, but upon hearing that he couldn't go out for the time being, he muttered that the deposit couldn't be refunded, but still gave the house number and all the people living with him.

Liu Chunmei was busy weighing vegetables for customers.

The local authorities told her not to stand in front of the stall anymore, so she handed the phone to her husband and asked him to take over packing up the stall. She then went to the back door of the vegetable shop to wait.

She recalled that her throat was dry for two days after the event, but she didn't have a fever or take any medicine. This condition was recorded separately in the current symptoms column.

Zhao Bo was loading goods in the warehouse, and his supervisor initially urged him to finish shipping the last truckload.

Local staff contacted the company directly, instructing the warehouse to keep the person in a separate rest room and then verify the identities of their colleagues.

Zhao Bo had eaten breakfast at the park's canteen that morning; the exact location was left to the relevant district to continue the investigation.

All three of them were outside the hospital premises. Song Lan asked Ma Hao to write down the return call time, the receiving unit, the contact level, and the official local receipt for follow-up arrangements.

Cheng Hao's phone rang for a long time. When he finally answered, he heard the caller ID from the clinic.

"I'm at the Qiaodong Community Health Service Center." His voice was hoarse, and he coughed after saying a few words. "I'm here with my mom for an IV drip. Did you call me because of that event last week?"

"Are you feeling unwell right now?" the disease control staff asked.

"I woke up this morning with a sore throat and a chill. I thought it was because I was in air conditioning for too long last night. I was just about to see a doctor, but I haven't been seen yet."

Someone quickly took over the call and instructed Cheng Hao to stay where he was and not to leave with his mother. At the same time, they contacted the duty officer at the Qiaodong Community Health Service Center.

Upon hearing that they were to stay put, Cheng Hao's tone immediately changed: "My mom just finished her IV drip. She has high blood pressure and walks slowly; we can't just leave her here alone."

"The medical staff will take care of her," the CDC staff replied. "Please put your mask on properly and tell the nurse that you feel cold and have a sore throat. Don't go through the infusion area to find a doctor; ask a staff member to come over."

The phone line was temporarily cut off, but the local authorities continued to contact the community health service center.

The current symptoms and medical records of Fang Cheng, Liu Chunmei, and Zhao Bo have also been supplemented. None of the three currently have a fever or cough, and they did not visit any medical institutions that day. The specific sampling arrangements are the responsibility of their respective street offices.

Ma Hao entered the contact numbers of the four people into the event staff list, but did not add anyone to the list of hospital exposed personnel.

He marked Cheng Hao's current location as Qiaodong Community Health Service Center, and left space for arrival time and contact area.

"At least those four names aren't empty anymore," he said, "but then Cheng Hao went to the community health service center again."

Song Lan was waiting for a reply from the local authorities when another intercom on the table rang.

The call was transferred from the medical on-call staff. The municipal CDC laboratory confirmed that Shao Dequan's re-collected sample was positive for both targets, and the official report has been uploaded.

Shao Dequan became the third officially positive patient.

The on-duty medical officer also conveyed the city's CDC's handling recommendations: Xu Wenliang, Gao Limin, and Shao Dequan had all participated in activities at the Kangning Hotel, and their shared exposure relationship was included in the investigation of the same cluster outbreak.

Participants and staff at both events are being tracked by the local authorities according to the sign-in sheet. At this stage, the source of infection is not being determined, and the hospital waiting area is not being listed as a common location for the onset of the disease.

Song Lan agreed and continued to keep the hospital routes for the three patients separate.

Lin Ye added the report time after Shao Dequan's status bar, and the three of them still each occupied a line in the courtyard.

The electronic versions of the two attendance sheets were also initially deduplicated at this time.

There were duplicate names in the morning and afternoon sessions, and the local authorities continued to verify them based on the ID number and mobile phone number.

People with underlying medical conditions, those who have already developed symptoms, or those who have recently visited medical institutions are prioritized for contact. The hospital only registers those who have traveled within the hospital grounds and their receipt numbers.

Based on the third positive report, the on-call medical staff reassessed the hospital's measures, and the hospital-level emergency response team has not yet adjusted the existing access areas.

Inside the isolation area of ​​the fever clinic, the doctor on duty relayed the results to Chen Xiulan via walkie-talkie.

Chen Xiulan paused for a while before speaking: "My son and grandson are still on the eighth floor. Have the results of their morning sampling come out yet?"

"Not yet," the attending physician replied. "Both of them are waiting in the original area, and their temperature and blood oxygen levels are currently normal. We'll notify you according to procedure when the results arrive. You will need to remain here for now."

"I'm not leaving." Chen Xiulan looked in the direction of the observation post. "His hearing is already poor, and when he coughs, he can't hear anything at all. I'm afraid he'll just tough it out and not say anything even if he's in pain."

The nurse relayed this to the bedside doctor.

Shao Dequan has been receiving oxygen as prescribed by the doctor, and his oxygenation has not decreased significantly yet. He remains under isolation and observation, and his subsequent transfer will be arranged by the municipal treatment team and the infectious disease department based on bed availability and his condition.

The bedside doctor checked Shao Dequan's consciousness and breathing again.

The elderly man had a fever and his face was burning hot. Even with an oxygen mask on, he was still able to raise his hand as instructed, and his blood oxygen level remained between 93% and 94%.

After hearing the official results, he asked twice, through his mask, where Chen Xiulan was.

The nurse used the intercom to get Chen Xiulan to reply: "I'm right outside. Listen to the doctor, don't be reckless."

After hearing this, Shao Dequan closed his eyes and did not try to sit up again.

Inside the administration building, the phone finally came back from the Qiaodong Community Health Service Center.

The person in charge on duty has already found Cheng Hao.

He accompanied his mother into the infusion observation area at 11:44 AM, but did not register as a patient upon entry. Staff rushed over to recheck his temperature, which was 38.9 degrees Celsius.

"The person has been moved to a separate room, and their mask has been changed." The voice on the other end of the phone spoke quickly. "His mother is being looked after by another nurse. Local sampling personnel are on their way."

The community health service center has suspended accepting new patients into the infusion observation area, and patients arriving later are being diverted through the other entrance.

The person in charge on duty instructed staff to keep the original registration, payment, and infusion records, and to record the monitoring time separately, so that they could be handed over to the relevant authorities when they arrived.

Song Lan asked, "How long did he stay from the moment he entered until he was led away from the infusion area?"

The other party has verified the registration and monitoring time.

"Forty-three minutes. During that time, there were always people in the infusion observation area."