The first coinfection patient was a 13-year-old girl (a student from Jinyun) who had no underlying diseases. She had taken swimming classes at a swimming center on July 25, 2019, where an adenovirus outbreak was identified, as seen in Figure 1. She was admitted to room 830 of the pediatric ward on July 30 (see Figure 2), presenting with a dry cough, a continual fever for two days with an initial temperature of 38.6 C and a high temperature of 40.2 C. She had no gastrointestinal symptoms. On physical examination, she had a body mass index of 23.5 kg/m2, and her vital signs were as follows: a heart rate of 120 beats per minute, 28 breaths per minute, an oxygen saturation of 95% at ambiance, and pharyngeal congestion oozing. Further examination revealed a decreased neutrophil absolute count and percentage, but normal liver, heart, and kidney functions and C-reactive protein (CRP) levels, as seen in Table 2. Chest radiography, performed on August 2 following disease onset, indicated slight thickening of the wall of the anterior and posterior segments of the right upper lobe, with the lumen slightly narrowed and the lower right lung slightly inflamed (Figure 3). Symptomatic treatment was started on the day of illness onset, without any oxygen or glucocorticoid therapy. The fever and cough resolved by August 1 and August 4, respectively (Figure 1). A throat swab sample collected on August 2 was positive for adenovirus (ct value: 28.8) and HCoV-229E (ct value: 32.5), as seen in Table 1. On August 5, the patient was discharged and recovered completely (Table 1). The period from illness onset to discharge was eight days (see Table 1 and Figure 1).