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

After the intranet to the orthopedic ward on the eighth floor was connected, head nurse Zheng Li answered the phone.

Zheng Li had already seen the "visitation suspended" notice at the nurses' station, but she was still unaware of the progress of Shao Dequan's medical review. Upon hearing Song Lan mention Shao Kai's name, she checked the night shift handover records.

"After the emergency room called last night, he waited at the nurses' station until almost 10 p.m. At that time, the ward had not received any further notice to restrict him, so we let him go back to bed six to be with his child. He went downstairs once this morning and returned to the eighth floor around 7:40 a.m. We only managed to get him into the treatment room after the notification was updated."

"Let him stay in the treatment room for now, and change his mask," Song Lan said. "Don't let him go downstairs by himself, and don't let the family members in the wards get close to that area. The on-duty staff will arrange for sampling personnel to go to the eighth floor."

Zheng Li asked about the child: "His son is still in bed six, with a fractured left shinbone. He was supposed to be discharged today. What will happen to the child?"

"Find out if they live together. The child should remain in the ward and discharge will be postponed. The decision will be made after evaluation by the infection control department and the attending physician."

Soon, the sound of a trolley wheel moving could be heard on the other end of the phone. Zheng Li had already left the nurses' station and was walking towards the treatment room, asking a ward nurse to send over a new mask while arranging for someone to look after the child in bed six.

In the administration building, Lin Ye pulled up the floor plan of the orthopedics department on the eighth floor. The elevator entrance, nurses' station, and bed number six's ward were all on the same corridor, but there was no record of where Shao Kai had been from yesterday afternoon until now.

The system prompts that the view is expanding at the edge of the field of view.

[Risk Area: Potential Exposure Range Expanding in Inpatient Wards]

[Key gaps: Shao Kai's activity route within the hospital, co-residents, and contact range in the ward]

Lin Ye switched the floor plan to the first floor and marked the checkout window and self-service machine.

"He was originally going to process the child's discharge, so we need to ask at the payment window and the self-service machine." Lin Ye turned the screen to Song Lan, "Where did you get the food? Did you leave the eighth floor last night? Ask those as well."

Song Lan nodded, added the two locations to the inquiry form, and then asked Zheng Li to bring the ward's work phone into the treatment room and turn on speakerphone.

Shao Kai's voice came quickly: "What exactly did my dad find out? He made me wait last night, then wouldn't let me go downstairs just now, and now he won't even let the kids leave."

"Your father's test results are still being reviewed," Song Lan said. "Two other people who were at the same location have already received official positive results, and your father also needs to continue to be isolated and evaluated. Now, let's check your route within the hospital from yesterday afternoon to today."

After a moment of silence, Shao Kai spoke, clearly anxious: "I didn't see my dad last night. He's in the fever clinic, and I'm on the eighth floor. Why are you checking on me?"

Do you usually live with your parents?

"We live together. My son lived with us before he was hospitalized."

Shao Kai began his story by recounting how he was discharged yesterday afternoon. He went to the inpatient settlement window on the first floor, but one document was missing, so he went back to the eighth floor to have the doctor sign it. He stayed in the ward with his family last night and went downstairs to buy food around 7:00 PM. This morning at 7:20 AM, he went to the self-service machine on the first floor again to print out the expense list, then bought bread and milk at the convenience store in the outpatient corridor, returning to the eighth floor around 7:40 AM.

"Which elevator did you take?" Lin Ye asked.

"Those two in the middle of the inpatient ward, whichever one you come in first, that's where you sit. I don't remember the numbers." Shao Kai's tone was sharp, but softened a bit in the next sentence, "My son is still in the ward, his mother is at home. If you leave me here, who will get my child discharged?"

Zheng Li took the phone: "Let's not do it today. The child's cast and X-rays are in the department, and there are people looking after him. If you run around now, we won't even be able to arrange who will take care of him later."

"Can my wife come up?"

"Don't call her over for now. She lives with you too, and the infection control team will contact her. Keep your phone charged so they don't turn it off when they try to reach you."

Shao Kai didn't mention going downstairs again, but instead asked the nurse to bring the charging cable from the child's backpack.

Zheng Li asked the ward nurse to fetch it, and casually gave Song Lan the names of the other two patients in bed six and their caregivers. The child had been in bed six since being admitted to the hospital and had not been to any other wards; Shao Kai had been going back and forth between the ward, the nurses' station, the payment window, the convenience store, and the inpatient elevator.

Song Lan divided the route into two levels: Zheng Li checked the information inside the orthopedics department on the eighth floor, while the security guard retrieved the corresponding time period footage for the checkout window, convenience store, and elevator. The on-duty officer coordinated with the hospital's emergency sampling team to carry protective equipment to the eighth floor via the designated route, preventing Shao Kai and the child from crossing the hospital on their own.

When the ward nurse brought over a charging cable, she also plugged in Shao Kai's phone. The child in bed six saw his father left in the treatment room across the corridor, and tried to walk out with crutches, but was helped back to his bedside by a nurse.

"Is Daddy going to be hospitalized too?" the child asked.

Shao Kai replied from across the treatment room door, "Listen to the nurse first, and don't step on the floor. A day later is a day later, just don't hurt your leg again."

After he finished speaking, he called his wife. Upon hearing that the child's discharge was postponed, his wife immediately said she wanted to come to the hospital to pick him up. Shao Kai stopped her, telling her to stay home and wait for a call from the local authorities, and reminded her to keep her ID card and usual medications nearby.

As the hospital's emergency sampling team ascended the stairs along the designated route, Shao Kaigang hung up the phone with his wife. He reassured her that someone was looking after the child, and then cooperated with the nurses to have his temperature and blood oxygen levels checked. His temperature was 36.8 degrees Celsius, and his blood oxygen saturation was 98%. He currently had no cough or sore throat.

The child's temperature and blood oxygen levels were within the normal range. The sampling personnel sealed the samples from the two individuals separately. The family contact information was confirmed by Shao Kai himself, and Zheng Li verified the ward and bed number.

Zheng Li left Shao Kai in the treatment room, with a nurse standing guard at the door. Access to the ward where bed six was located was suspended; other patients in the same room continued to wear masks, and those who were originally scheduled to be discharged remained by the bedside. As the nurse pushed the sampling equipment over, someone peeked into the corridor and asked what was going on.

"Go back to your wards and wait for the department's notification." Zheng Li persuaded everyone to go back. "If anyone changes floors now, we'll have to search all over again later."

A caregiver who had just carried a travel bag containing clothes to the door heard this and put it back under the bed. He asked what to do about the afternoon's high-speed rail ticket, and Zheng Li told him to keep the order first, and to wait for further notice from the hospital regarding refunds and changes.

At the workstation in the administration building, the security guard first transmitted the image of the inpatient settlement window.

At 7:23, Shao Kai stood in front of the self-service machine and pressed the screen. The machine jammed, so he went to the next window to ask a couple more questions. When he left at 7:29, there were already more than a dozen people behind him in line.

The convenience store payment records matched. At 7:34, a bag of bread and a carton of milk were paid for; the payer's mobile phone number matched Shao Kai's registered number.

Ma Hao filled in the two times on the route chart: "He stopped on the first floor for about twenty minutes. At that time, the hospital had not yet started restricting the movement of people."

"Save the people in the video by time, and don't shout in the lobby yet." Song Lan instructed the security guards to save the original video recordings and reported the checkout window and convenience store on the first floor to the hospital's emergency response team.

The call then came in from the on-call medical staff. The initial situation on the eighth floor had been reported to the hospital's emergency response team.

"The emergency department will maintain its current triage system, with separate entrances for the fever clinic and the general emergency department. New patient admissions, bed transfers, and discharges will be suspended on the eighth floor pending infection control assessment. The row of self-service machines at the inpatient settlement window will be temporarily closed; staff will remain in place and await further instructions."

Song Lan reminded him: "Shao Kai went to the convenience store and also rode the two hospital elevators in the middle. The footage is still being adjusted."

"Continue to review the footage from the convenience store and elevator, keep the original records, and add them to the receipt. How to control the ward and who to sample will be determined by the emergency response team and the relevant authorities. The emergency room will continue to admit critically ill patients as usual; don't let people at the entrance all rush out as soon as they hear the word 'pause'."

After the phone call ended, the notice restricting the movement of people was relayed to the relevant nurses' stations and service windows. Registration for ward patients began on the eighth floor, and the row of self-service machines that Shao Kai had visited in the first-floor payment area was temporarily closed. Security guards rushed to the inpatient elevator entrance. Song Lan added the convenience store and inpatient elevator receipts to her card.

At 11:28, the sampling staff on the eighth floor reported that samples from Shao Kai and the child had been collected, and both of their vital signs were temporarily normal. The list of patients and caregivers in the same room as the patient in bed six has also been completed.

At the same time, the two elevators in the middle of the inpatient department were temporarily shut down, and disinfection personnel began to handle the elevator cars and waiting areas.

Security guards moved the barriers to the elevator entrance on the first floor, and the nursing stations on each floor of the inpatient department were also notified of the suspension of operations. Patients waiting for the elevator were advised to return to their wards, and anyone needing to be transferred had to report their name and destination through the nursing station.

On the route map of the administration building, the vertical line between the eighth floor and the first floor is marked separately.

One end of the line is the sixth bed in the orthopedics department, and the other end is the settlement window where more than a dozen people have lined up during the morning rush hour.