Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), discusses the medical record at PUMCH in Beijing, capital of China, Aug. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths.

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), discusses the medical record at PUMCH in Beijing, capital of China, Aug. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths.

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), leaves the wards, soaked with sweat, at the Zhongfaxincheng campus of Tongji Hospital affiliated to Huazhong University of Science and Technology in Wuhan, central China's Hubei Province, Feb. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team. Liu also took a lead to coll

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), checks a patient's situation at the wards at PUMCH in Beijing, capital of China, Aug. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team. Liu also took a lead to collect samples for COVID-19 test from patients, encouraging other medical workers to fight together.

Liu Zhengyin (L), senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), talks to his colleague at PUMCH in Beijing, capital of China, Aug. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths.

Liu Zhengyin (L), senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), works at a ward at the Zhongfaxincheng campus of Tongji Hospital affiliated to Huazhong University of Science and Technology in Wuhan, central China's Hubei Province, Feb. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths.

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), checks a patient's situation at the wards at PUMCH in Beijing, capital of China, Aug. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team. Liu also took a lead to collect samples for COVID-19 test from patients, encouraging other medical workers to fight together.

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), talks to his patient at PUMCH in Beijing, capital of China, Aug. 12, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team. Liu also took a lead to collect samples for COVID-19 test from patients, encouraging other medical workers to fight together against the infectious disease.

Liu Zhengyin (L), senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), collects samples from a patient at the Zhongfaxincheng campus of Tongji Hospital affiliated to Huazhong University of Science and Technology in Wuhan, central China's Hubei Province, Feb. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team.

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), talks to his patient at PUMCH in Beijing, capital of China, Aug. 12, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team. Liu also took a lead to collect samples for COVID-19 test from patients, encouraging other medical workers to fight together against the infectious disease.

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), checks the scanning result of a patient at PUMCH in Beijing, capital of China, Aug. 12, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team. Liu also took a lead to collect samples for COVID-19 test from patients, encouraging other medical workers to fight together.

Liu Zhengyin (2nd L), senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), discusses medical record with other medical workers at PUMCH in Beijing, capital of China, Aug. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team.

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), presents the message he wrote to mark the upcoming Medical Workers' Day at PUMCH in Beijing, capital of China, Aug. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team.

Liu Zhengyin (R), senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), poses for a photo with his colleague at the Zhongfaxincheng campus of Tongji Hospital affiliated to Huazhong University of Science and Technology in Wuhan, central China's Hubei Province, Feb. 14, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths.

The combo photo shows portraits of Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), in Wuhan, central China's Hubei Province, on Feb. 24, 2020 (L, photo taken by Ji Chunhong) and at PUMCH in Beijing, capital of China, on Aug. 14, 2020 (R, Xinhua/Zhang Yuwei). Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team.

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), talks to his patient at PUMCH in Beijing, capital of China, Aug. 12, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team. Liu also took a lead to collect samples for COVID-19 test from patients, encouraging other medical workers to fight together against the infectious disease.

Liu Zhengyin, senior doctor and doctoral supervisor from the Infection Department at the Peking Union Medical College Hospital (PUMCH), checks the scanning result of a patient at PUMCH in Beijing, capital of China, Aug. 12, 2020. Liu was head of PUMCH's first medical assistance team to Wuhan during the COVID-19 outbreak. After arriving in Wuhan in January, the medical team set up general wards and an intensive care unit (ICU) for COVID-19 patients. Liu was among the first group of doctors who entered the wards and directly contacted with the patients. In face of limited understanding on the epidemic at the initial stage, Liu himself couldn't help crying bitterly and kept reflecting on why the treatment had failed to save more lives during a meeting to discuss the causes of patients' deaths. This scene deeply touched other members of the medical team.