Study Design

About STIp2021

This is a territory-wide study, which aims to explore the epidemiology and public attitudes to health policies regarding human papillomavirus (HPV) and other sexually transmitted infections (STIs) in Hong Kong.


To enroll, participants must have received an invitation from The Chinese University of Hong Kong and meet the following criteria:

  • Age of 18 or above;
  • Ever have sex;
  • Normally living in Hong Kong
  • Could communicate in written and spoken English or Chinese

This study includes two parts.

Part 1: at baseline, participants are invited to complete an online questionnaire (<20 min). The Research Team would then deliver a self-sampling kit to a participant’s selected pick-up location. Please follow the instruction for self-sampling, and return the collected samples to the Research Team.

Part 2: one year afterwards, participants are invited to complete a simple online follow-up questionnaire (<10 min) and self-collect the samples.

Flow Chart
Flow Chart

*Medical referral will be made if tested Neisseria gonorrhoeae and/or Chlamydia trachomatis positive

Study FAQ

Safety and Costs

Is this study safe?
There are no foreseeable physical, psychological, social, or economical harms of joining the study. You may experience minor pain or slight discomfort during self-sampling.
How much does this study cost? Do I have to pay for anything?
Sample collection kits, basic delivery and testing in this study are free. 

Data and Personal Information

What happens to my data?
Data collected will be used for research purpose only. All data will be password protected and accessed by designated research staff only. Research findings will be presented in aggregates not referrable to individuals. All collected data will be destroyed 5 years after completion of the study. Personal information of participants will not be disclosed. Remaining samples will be used only for the purpose of further investigation or validating results of the same study. 
Who can see my data and personal information?
This is an anonymous study. Your information and data will be kept strictly confidential. Only the designated research staff have access to the data and your information will not be disclosed to any third party, including your family members. 

Participation and Withdrawal

Who can participate?
You are eligible to participate if you have 
(1) received an invitation letter from The Chinese University of Hong Kong, 
(2) aged 18 or above, 
(3) ever have sex, 
(4) normally living in Hong Kong and 
(5) could communicate in written and spoken English or Chinese. 
How can I participate?
To participate, check the invitation letter for your Household Number, which is below the QR code. You can scan the QR code provided on the invitation letter to fill in the e-consent form, enter your Household Number and complete the online survey.
What if I change my mind about participating?
You can leave the study at any time. Your decision to leave will NOT incure any penalty. 

Self-sampling and Test Results

What is self-sampling?
"Self-sampling" is the collection of samples by yourself without the assistance of clinical staff. The collected samples would be sent to the laboratory for testing. You can decide on the time, venue and setting for self-sampling.
If you agree to join, we will deliver a self-sampling kit (mainly for urine and swab collection) to your selected pick-up location. You only have to follow the self-sampling instruction and return the collected samples to us. 
Am I suitable for self-sampling?
 Men: All men are suitable for urine collection and HPV self-sampling.
Women: All women are suitable for urine collection, but HPV self-sampling is NOT suitable for below individuals:
  • Currently pregnant
  • Have ever had a (total) hysterectomy
  • Have ever been diagnosed with any types of genital cancers (i.e. cervical cancer, breast cancer, ovarian cancer or vaginal cancer, etc.)
  • Have ever been diagnosed with any impaired immunity (i.e. Systemic Lupus Erythematosus, SLE) or on treatment for immunodeficiency (e.g. long-term steroids users)
  • Please don't hesitate to contact us if you encounter any questions regarding self-sampling!
    How to do self-sampling?
    Self-sampling is simple and safe. You may refer to the instructions attached in the self-sampling package or watch this video for more information about female HPV self-sampling.
    What kind of tests would be performed?
    If samples have been as instructed, our laboratory would test for Neisseria gonorrhoeae and Chlamydia trachomatis infections in urine samples, and human papillomavirus infection in swabs.
    Will I receive my test results?
    Test results will be sent back to you. Medical referral will be made if you are tested positive for Neisseria gonorrhoeae or Chlamydia trachomatis. 
    What should I do if I were tested positive?
    Neisseria gonorrhoeae and Chlamydia trachomatis:
    If tested positive, medical referral would be made for follow up
    Human papillomavirus (HPV):
    For male: No further action is needed. Thanks for helping us understand the epidemiology of HPV.
    For female: If tested positive, recommendations would be made according to test results.

    More questions?

    Should you have further enquiries about this study, please do not hesitate to contact us by email or phone.

    For more information about the Research Team, please visit:

    Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong:

    The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong :