The first confirmed case of 2019-nCoV in the United States was reported on January 20, 2020. The patient, a 35-year-old man, had traveled to Wuhan, China, and presented with mild symptoms, including a cough and fever. He was initially evaluated at an urgent care clinic in Washington State, where he was tested for various respiratory infections. Despite negative results for influenza and other common pathogens, the patient was later found to be infected with 2019-nCoV. The patient was isolated and monitored by local health authorities. On January 20, the CDC confirmed the infection through real-time reverse-transcriptase-polymerase-chain-reaction (rRT-PCR) testing. The patient was admitted to a hospital for further evaluation and treatment. The patient's condition progressed, with the development of fever, tachycardia, and respiratory symptoms. Chest radiographs showed no abnormalities initially but later revealed pneumonia in the left lower lobe. The patient received supportive care, including oxygen therapy and antipyretics. The patient's condition improved over time, with the resolution of fever and other symptoms. The case highlights the importance of close coordination between clinicians and public health authorities in identifying and managing emerging infectious diseases. The case also underscores the need for rapid dissemination of clinical information to ensure appropriate care and prevention of further transmission. The patient's viral load was high, and the virus was detected in multiple specimens, including respiratory and stool samples. Genetic sequencing confirmed that the virus was closely related to the 2019-nCoV reference sequence. The case illustrates the challenges in diagnosing and managing 2019-nCoV, particularly in the early stages of the outbreak. The patient's initial mild symptoms made it difficult to identify the infection, emphasizing the need for careful clinical evaluation and public health surveillance. The case also highlights the importance of identifying and isolating patients with potential exposure to the virus to prevent further spread. The report emphasizes the need for continued research and surveillance to better understand the clinical spectrum and transmission dynamics of 2019-nCoV.The first confirmed case of 2019-nCoV in the United States was reported on January 20, 2020. The patient, a 35-year-old man, had traveled to Wuhan, China, and presented with mild symptoms, including a cough and fever. He was initially evaluated at an urgent care clinic in Washington State, where he was tested for various respiratory infections. Despite negative results for influenza and other common pathogens, the patient was later found to be infected with 2019-nCoV. The patient was isolated and monitored by local health authorities. On January 20, the CDC confirmed the infection through real-time reverse-transcriptase-polymerase-chain-reaction (rRT-PCR) testing. The patient was admitted to a hospital for further evaluation and treatment. The patient's condition progressed, with the development of fever, tachycardia, and respiratory symptoms. Chest radiographs showed no abnormalities initially but later revealed pneumonia in the left lower lobe. The patient received supportive care, including oxygen therapy and antipyretics. The patient's condition improved over time, with the resolution of fever and other symptoms. The case highlights the importance of close coordination between clinicians and public health authorities in identifying and managing emerging infectious diseases. The case also underscores the need for rapid dissemination of clinical information to ensure appropriate care and prevention of further transmission. The patient's viral load was high, and the virus was detected in multiple specimens, including respiratory and stool samples. Genetic sequencing confirmed that the virus was closely related to the 2019-nCoV reference sequence. The case illustrates the challenges in diagnosing and managing 2019-nCoV, particularly in the early stages of the outbreak. The patient's initial mild symptoms made it difficult to identify the infection, emphasizing the need for careful clinical evaluation and public health surveillance. The case also highlights the importance of identifying and isolating patients with potential exposure to the virus to prevent further spread. The report emphasizes the need for continued research and surveillance to better understand the clinical spectrum and transmission dynamics of 2019-nCoV.