阳过一次，多久会感染第二次新冠

　　戴好口罩也是避免感染的重要措施。由于病毒常通过飞沫和气溶胶形式传播，口罩是行之有效的预防措施。在病毒浓度高的地方，口罩叠加“多通风”、“保持社交距离”的组合拳使用，效果更佳[21]。

　　核酸或抗原转阴后，也不要太得瑟，别着急出门约朋友大吃大喝。美国CDC建议，该有的防护措施不能少，需要痊愈后至少11天左右，才能确认自己真正“阳康”[22]。

　　此外，勤洗手、多消毒等生活常识，是疫情几年来大家养成的生活习惯，也是自己和家人健康负责的重要方式。

　　既然大部分人都至少要变身一次“小阳人”，那不妨放平心态，用科学知识和药品、生活用品好好应对，祝我们都平安地度过这个冬天。

　　本文科学性已由女王大学病理及分子医学硕士伍丽青审核

　　参考文献：

　　[1]https://coronavirus.data.gov.uk/details/cases?areaType=nation&areaName=England.

　　[2] Kara Steel, R.C.and Z.C. (2022) Coronavirus (COVID-19) infection survey, characteristics of people testing positive for covid-19, UK: 16 november 2022, Coronavirus (COVID-19) Infection Survey, characteristics of people testing positive for COVID-19, UK - Office for National Statistics. Office for National Statistics. Available at:https://www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/conditionsanddiseases/bulletins/coronaviruscovid19infectionsurveycharacteristicsofpeopletestingpositiveforcovid19uk/latest (Accessed: December 14, 2022).

　　[3] Pulliam, J. R., van Schalkwyk, C., Govender, N., von Gottberg, A., Cohen, C., Groome, M. J., ... & Moultrie, H. (2022). Increased risk of SARS-CoV-2 reinfection associated with emergence of Omicron in South Africa. Science, 376(6593), eabn4947.

　　[4] Chemaitelly, H., Ayoub, H. H., Tang, P., Hasan, M. R., Coyle, P., Yassine, H. M., ... & Abu-Raddad, L. J. (2022). Immune imprinting and protection against repeat reinfection with SARS-CoV-2. New England Journal of Medicine, 387(18), 1716-1718.

　　[5] 二次確診人數呈上升趨勢　專家倡推第四階段「疫苗通」 (no date) 香港文匯網. Available at: https://www.wenweipo.com/a/202208/30/AP630d511ee4b033218a5fd54b.html (Accessed: December 14, 2022).

　　[6] Bastard, J., Taisne, B., Figoni, J., Mailles, A., Durand, J., Fayad, M., ... & Bernard-Stoecklin, S. (2022). Impact of the Omicron variant on SARS-CoV-2 reinfections in France, March 2021 to February 2022. Eurosurveillance, 27(13), 2200247.

　　[7] Nguyen, N. N., Houhamdi, L., Delorme, L., Colson, P., Gautret, P., & Nguyen, N. N. (2022). Reinfections with Different SARS-CoV-2 Omicron Subvariants, France. Emerging Infectious Diseases, 28(11).

　　[8] Australian Government Department of Health and Aged Care (2022) AHPPC statement on covid-19 winter update and ongoing health protection measures to support our community, Australian Government Department of Health and Aged Care. Australian Government Department of Health and Aged Care. Available at: https://www.health.gov.au/news/ahppc-statement-on-covid-19-winter-update-and-ongoing-health-protection-measures-to-support-our-community (Accessed: December 14, 2022).

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　　[11] Wu, F., Liu, M., Wang, A., Lu, L., Wang, Q., Gu, C., ... & Huang, J. (2020). Evaluating the association of clinical characteristics with neutralizing antibody levels in patients who have recovered from mild COVID-19 in Shanghai, China. JAMA internal medicine, 180(10), 1356-1362.

　　[12] Chemaitelly, H., Nagelkerke, N., Ayoub, H. H., Coyle, P., Tang, P., Yassine, H. M., ... & Abu-Raddad, L. J. (2022). Duration of immune protection of SARS-CoV-2 natural infection against reinfection. Journal of Travel Medicine.

　　[13] ?züdo?ru, O., Bah?e, Y. G., & Acer, ?. (2022). SARS CoV-2 reinfection rate is higher in the Omicron variant than in the Alpha and Delta variants. Irish Journal of Medical Science (1971-), 1-6.

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　　[16] Tag-VE statement on Omicron Sublineages BQ.1 and XBB (no date) World Health Organization. World Health Organization. Available at: https://www.who.int/news/item/27-10-2022-tag-ve-statement-on-omicron-sublineages-bq.1-and-xbb (Accessed: December 17, 2022).

　　[17] Abu-Raddad, L. J., Chemaitelly, H., & Bertollini, R. (2021). Severity of SARS-CoV-2 reinfections as compared with primary infections. New England Journal of Medicine, 385(26), 2487-2489.

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　　[22] Isolation and precautions for people with covid-19 (no date) Centers for Disease Control and Prevention. Centers for Disease Control and Prevention. Available at: https://www.cdc.gov/coronavirus/2019-ncov/your-health/isolation.html (Accessed: December 16, 2022).