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

At 4:30, the alarm clock in the lounge went off.

When Lin Ye opened his eyes, it was still light outside the window. He sat up for a few seconds, went to the sink to get a handful of cool water, wiped the sleepiness off his face, and then wrote down his return-to-work time on the registration form at the door.

As soon as the door to the list verification office opened, Ma Hao handed over a newly printed catalog.

"Look at the top first," he said. "The first batch of results from inside the facility just came back, and I've already separated them by region. The section for people involved in activities outside the facility is for their local area; I didn't include them here."

The catalog is divided into several sections by area: fever clinic, emergency CT related area, specimen transport channel, eighth floor orthopedics, first floor checkout area and convenience store.

Each column lists the number of people sampled, the sampling time, the result reporting time, and the next re-sampling point.

Lin Ye started reading from the first line.

The samples from the 23 staff members in the fever clinic, emergency CT-related areas, and specimen transport channels, whose results have already been obtained, all tested negative for the relevant targets.

The first batch of seventeen patients, caregivers, and staff in the eighth-floor orthopedic ward also did not test positive for the relevant targets.

The results from the six staff members on duty at the checkout window and convenience store have been reported, and there are currently no new anomalies.

"There are forty-six in total." Ma Hao pulled up the electronic receipts on his computer. "The report numbers are all there, and it's clear who took the samples at what time and in which area."

Two lines of light blue prompts then appeared at the edge of Lin Ye's field of vision.

[Risk Direction: The scope of risk within the hospital is beginning to narrow]

[Key gaps: Sampling time, exposure area, and resampling point corresponding to negative results]

Lin Ye didn't immediately scroll down: "When will the re-extraction take place?"

"Those with direct contact and long stays are listed separately." Ma Hao clicked on another page, "The first negative test result cannot be used as the basis for lifting management. This sentence is written at the top of the requirements for infection control during the day shift. People in other wards on the eighth floor and the general outpatient floor do not have overlapping routes, so they will not be included in the priority retest list for now."

The sampling time of one of the emergency CT cleaning staff members was highlighted separately by Ma Hao with a red box.

When the sample was collected, the cleaning work for the day was not yet finished, and the equipment room was visited again later. Although the report did not detect the relevant target, Ma Hao still recalculated the re-sampling node based on the last time he left the relevant area, and did not directly transfer this report to the yellow observation column.

Lin Ye opened the duty log and found that the cleaning end time, access control records, and re-collection arrangements matched up.

The last time he entered the equipment room was circled in red at the bottom of the record by Ma Hao.

"Who discovered this?"

"Me," Ma Hao answered quickly, then added, "After Professor Song reviewed it, she kept this re-sampling marker."

Lin Ye looked up at him.

Ma Hao felt a little uncomfortable being stared at: "While you were sleeping, I was working. The call back from the medical on-call duty officer is at the very end."

"I didn't say you were free."

"Your gaze is more like you're finding fault than when Director Qin asks about the patient's progress."

Lin Ye pulled the catalog closer to him and rechecked the information in the three columns.

Ma Hao has placed the sampling time and potential exposure periods side by side.

According to the hospital infection control receipt, those who need to be retested are marked in red, while those whose routes do not overlap and who currently have no symptoms are moved to the yellow observation column.

Each modification is followed by the person in charge of infection control and the time of their callback.

After finishing her phone call, Song Lan walked over and glanced at the results: "These results only indicate that there are currently no new cases. We can't just release people based on a negative report. The on-call medical staff is currently confirming the scope of the next round with the hospital's emergency response team."

Ma Hao handed her the page for the eighth floor: "The staff in the same ward as bed six, the nurses' station, and the two elevators in the middle will remain in the priority review section. The surveillance cameras and access control systems in the ward at the other end of the eighth floor do not overlap, and the temperature screening did not report any abnormalities."

Where did you put the original receipt?

"In-hospital testing catalog. External cooperation catalog only retains the corresponding numbers, and there are no duplicate documents between the two sides."

Song Lan checked the hospital's testing catalog, then called back the medical on-call team.

"All 46 results have been returned, and the zoning table and re-sampling schedule have been sent to you." She continued, looking at the screen, "The next round of recommendations is to focus on the fever clinic, the emergency CT-related areas, the specimen transport corridor, the area around bed 6 on the eighth floor, and the people who have been in contact with confirmed cases on the first floor. People on floors with no overlapping routes will not be added to the emergency re-testing list."

The person on the other end of the phone inquired about the surveillance footage and access control records on the eighth floor, and also verified the source of the initial report.

A few minutes later, the on-call medical officer answered the phone again: "The priority review area will be narrowed down based on the existing evidence. General wards will remain in their original work areas; the hospital's temporary closed-loop management will not be lifted. Whichever area experiences fever, cough, or abnormal test results again, that area will be upgraded separately."

Ma Hao removed most of the red markers that originally covered the entire page in the office.

People still cannot freely enter or leave the general wards, and the emergency room entrance continues to be divided into different groups, but there are finally clear boundaries for those who are most urgently needed for follow-up examinations in the next round.

Zhou Min then called from the emergency room.

No new abnormalities have been found in the temperature screening of emergency room staff on the day shift. The resuscitation area and general reception area continue to operate with their original entrances. The two staff members who completed their emergency room support duties have returned to their respective areas and are awaiting further rotation notices.

"People can change shifts within the same area, but they can't cross areas to return to their dormitories for the time being," Song Lan told her. "If you develop symptoms or receive an abnormal report, just report your name and location separately; you don't need to copy the entire shift schedule again."

Zhou Min agreed and hung up the phone.

The printer finally stopped for a while.

Ma Hao leaned back in his chair and rubbed the back of his neck. "I used to think that the more comprehensive the list, the safer it was. I only realized today that if you put everything on the list, the people you really need to find first will get buried."

"You got the assignment right this time," Lin Ye said.

Ma Hao turned to look at him: "Say it again, I'll record it and save it for the defense."

Lin Ye picked up the next reply slip: "It's too late to record now, I've already finished speaking."

Despite grumbling, Ma Hao had already dragged the new receipt into the corresponding directory. The two of them each took on half the work, continuing to check from the latest receipt.

Just after 5 p.m., the on-call medical staff called again.

"Move Gao Limin's schedule forward," the person on the other end of the phone said directly. "He just finished a bedside reassessment. With oxygen via nasal cannula at 3 liters per minute, his blood pressure can reach 94. When he coughs or turns over, it drops to 90 or 91. His breathing rate is around 28 breaths per minute. He is conscious, and his blood pressure can be maintained."

The respiratory department reassessed his condition based on his age, chest imaging, and changes in oxygenation. The medical team has decided on low-flow oxygen therapy for transport, and a intensive care bed has been reserved in the infectious disease ward of the designated hospital. The negative pressure ambulance is expected to arrive in half an hour.

The receiving hospital required Gao Yuan to report his blood oxygen and respiratory rate again before boarding the ambulance. Gao Yuan remained in his original observation position; his resting blood oxygen level was still 96, so he couldn't join this trip.

The on-call medical officer asked on the phone, "Who is currently keeping Gao Limin's paper records?"

Ma Hao immediately retrieved the fever clinic receipt: "Most of the data is by the bedside. Gao Yuan also has a receipt for his father's X-ray and the original data bag. They need to be transferred from the isolation observation area."

"Let the fever clinic take over according to the transfer procedure, so that the father and son don't have to meet to hand in documents."

After hanging up the phone, Song Lan relayed the division of labor confirmed by the medical on-call supervisor.

"Ma Hao, stay here to receive the hospital's patient list." She looked at Lin Ye. "The fever clinic's clean area is short one person to verify the transfer information. Go through the designated channel; collect your protective gear at the entrance. Once you arrive, follow the instructions of the bedside doctor and don't cross the isolation door."

Lin Ye agreed and registered his destination at the office door.

Song Lan reported the allocation time to the medical on-call supervisor, and the access control guard simultaneously received Lin Ye's access area. He only used the designated corridor from the administration building to the fever clinic, and did not return to the list office after reaching the clean area. Ma Hao continued to take over the work in the next round.

Before leaving, Ma Hao sent Gao Limin's electronic catalog to the cleaning area workstation, which included the report number, family member's phone number, and pending paper documents.

"I'll take care of things here," he said. "You won't need to ask from the beginning when you get there."

Lin Ye finished reading the catalog and closed the office door.

Gao Limin went first, while Gao Yuan stayed where he was.