请帮我查找新冠重复感染相关的文献

以下是几篇关于新冠重复感染的文献：

1. Lu, J., Peng, J., Xiong, Q., Liu, Z., Lin, H., Tan, X., ... & Liu, J. (2021). Clinical, immunological and virological characterization of COVID-19 patients that test re-positive for SARS-CoV-2 by RT-PCR. EBioMedicine, 67, 103381.

2. Li, J., Zhang, L., Liu, B., Song, D., & He, W. (2021). Clinical characteristics and risk factors for re-positive of SARS-CoV-2 nucleic acid in discharged patients. Epidemiology and Infection, 149, e60.

3. Huang, J., Zhang, X., & Zhang, Y. (2021). Clinical and epidemiological characteristics of COVID-19 patients with re-detectable positive nucleic acid test. Journal of Medical Virology, 93(6), 3607-3615.

4. Han, W., Quan, B., Guo, Y., Zhang, J., Lu, Y., Feng, G., ... & Chen, X. (2021). The course of clinical diagnosis and treatment of a case infected with SARS-CoV-2 with re-detectable positive RNA test. Journal of Medical Virology, 93(6), 3623-3628.

5. Chen, X., Li, R., Pan, Z., Qian, C., Yang, Y., & You, R. (2021). Clinical and epidemiological characteristics of re-positive patients with COVID-19 in China: a systematic review and meta-analysis. BMC Infectious Diseases, 21(1), 1-11.