With the rampant COVID-19 epidemic situation still raging, Omicron subvariants BA.4 and BA.5 drive surge in cases and become the main COVID strain in HK. Through the Omicron Neutralizing Antibody Screening, you can better understand if there is an immune response after vaccination, whether you may have previously been infected by Omicron BA.1 BA.2 & BA.4/BA.5, and/or have adequate protection antibodies including neutralizing antibodies against future infection.