Evaluating Population Immunity against COVID-19 and Other Respiratory Virus Infections (EPI-HK Study)

The research team at the HKU School of Public Health have been at the forefront of research into COVID-19. One major question is “how many people have been infected so far”. The HKU team are part of a large consortium of international experts to answer this question in different parts of the world.

In Hong Kong, we sincerely invite all Hong Kong residents of all ages to join our study, so that we can collect blood samples to look for evidence of infection with COVID-19 as well as other respiratory viruses such as influenza in the community. In addition to determining the frequency of infection, we will also be able to determine how long immunity will last after infection and vaccination. To achieve this, we will regularly monitor the health conditions of our study participants through questionnaires, blood draws and respiratory sample collection. When participants report acute respiratory symptoms, we will collect additional respiratory samples.

To show our appreciation of the participant’s support, we will provide study participants with basic body check, supermarket coupons and free influenza rapid test.





Eligibility | 參與資格

You are eligible to join the study if you meet the following requirements:

  • Individual of any ages residing in Hong Kong
  • Planning to continue to reside in Hong Kong for at least one year


  • 現正在香港居住的任何年齡人士
  • 打算在未來一年亦在香港居住
Acknowledgement of Participation | 感謝參與

No cost will be incurred for joining this study. To appreciate your time spent and support for our study, for each visit for blood draw and respiratory samples collection during the regular follow-up every 6 months, you will receive supermarket coupon valued at HK$100; and if you agree to provide additional blood or stool samples, you will receive an additional supermarket coupon valued at HK$50.

Upon the report of an eligible respiratory illness, for each visit with respiratory samples collection, you will receive supermarket coupon valued at HK$50; and if you agree to provide additional blood samples, you will receive an additional supermarket coupon valued at HK$50.

In addition, you will receive a complementary influenza rapid test in the first visit for each eligible respiratory illness. If you have completed the follow-up study activities in a year, we will offer you a basic body check service. 

參與此研究費用全免。為答謝您參與本研究所花耗的時間及對本研究的支持,在每六個月一次的定期研究跟進提供血液及呼吸道樣本後,我們會給予您面額港幣 100 元超級市場禮券;若您提供額外血液或糞便樣本,我們會額外給予您面額港幣 50 元超級市場禮券。

在每次因呼吸道徵狀而家訪並提供呼吸道樣本後,我們會給予您面額港幣 50 元的超級市場禮券;若您提供額外血液樣本,我們會額外給予您面額港幣 50 元超級市場禮券;


Data Confidentiality & Privacy | 資料保密

We will keep your information, including your contact details, your personal information, or any laboratory testing results strictly confidential in accordance with the University of Hong Kong Privacy Policy Statement (Click here for more details).


Enquiries | 聯絡研究團隊

+852 9842 3057
+852 9842 3057
+852 9842 3057