Preliminary Study of the Protectiveness of Vaccination Against the COVID-19 in the Outbreak of VOC Omicron BA.2 - Jilin City, Jilin Province, China, March 3-April 12, 2022.

• DOI: 10.46234/ccdcw2022.081
• Publication Date: 2022-05-06
• Authors: Xuebin Fan; Shan Lü; Lu Bai; Haican Liu; Junshao Fu; Xiaoxun Jin; Yulong He; Jinxing Lu; Xiaoping Dong
• Keywords: Booster (rocketry); Booster dose

An outbreak of coronavirus disease 2019 (COVID-19) Omicron BA.2 emerged in Jilin City since March 3, 2022, which involved 27,036 cases by April 12. The vaccination program with inactivated COVID-19 vaccines has been implemented the beginning 2021.The incidences moderate, severe, and critical whole population group 0+1 dose were 1.82-, 9.49-, 3.85-fold higher than those 2 doses, 5.03-, 44.47-, ∞-fold received 3 doses vaccination. For ≥60 years, 29.92, 9.62, 4.27 per 100,000, showing 4.13-, 43.72-, 4.85-fold as well 13.28-, 22.37-, doses.The each type who fully vaccinated or booster significantly lower unvaccinated and/or partially vaccinated. Booster homologous induces stronger protectiveness for caused variant concern (VOC) Omicron.