Background: The pandemic caused by the new coronavirus is overwhelming the world. Bacteria and fungi were detected in some cases, which suggested the associations between COVID-19 and bacterial and fungal infections. Objectives: To provide suggestions and treatment opinions by analyzing laboratory data of COVID-19 patients co-infected with bacteria. Methods: We analyzed 63 patients with COVID-19 admitted to the isolation ward of the First Affiliated Hospital of Wenzhou Medical University. COVID-19 was detected using PCR, and bacteria were identified using culture. Patients were divided into two groups, including those with and those without bacterial infections, and differences in hematologic indices between the groups were analyzed. Results: There were 63 patients with median age of 55. 82 years. The average hospital stay was 22. 56 days. Seven patients (11. 11%) had coincident bacterial infections. Detection rates in sputum/alveolar lavage and blood were the highest, 60. 52% and 21. 05%, respectively. Klebsiella pneumoniae, Acinetobacter, and STENOTROPHOMONAS maltophilia were the most common found in 31. 58%, 18. 42%, and 15. 79%, respectively. Interleukin 6 (IL-6) levels were elevated in 84. 13% of patients, while IL-10 levels were elevated in 69. 84%, blood ammonia levels were elevated in 82. 05%, lactate levels were elevated in 75. 41%, and LDH levels were elevated in 69. 84%. There were significant differences between the groups in terms of expression levels of IgG, C4, AST, LDH, IL-6, IL-10, percentage of neutrophils, percentage of lymphocytes, and platelets. Conclusions: For patients with COVID-19 suspected of having bacterial infections, empiric antibiotics should be given to cover K. pneumoniae, Acinetobacter, and S. maltophilia.