Cervical Screening Programme
Department of Health
The Government of the Hong Kong Special Administrative Region

[Home] [Graphical Version] [繁體中文] [簡体中文] [Site Map] [Search]

What is the cervical cancer vaccine? How effective is the cervical cancer vaccine? How is the cervical cancer vaccine given? Are there any side effects from the cervical cancer vaccine? Who should have the cervical cancer vaccine? What is the cervical cancer vaccine? The cervical cancer vaccine is a prophylactic vaccine developed to prevent about 70% of cervical cancer by preventing infection by two high risk HPV types (HPV types 16 and 18). How effective is the cervical cancer vaccine? The cervical cancer vaccine is most effective in women who have never been exposed to HPV types 16 and 18 infections. Current data showed that it is 100% effective in preventing precancerous changes (CIN) caused by HPV types 16 and 18. However, HPV 16 and 18 infections account for 70% of cervical cancer. Therefore, vaccinated women can still be infected or have CIN caused by other HPV types. As the vaccines cannot protect against infection by other high risk types of HPV, nor can they clear the virus in those who are already infected, they cannot eliminate the need of cervical screening. How is the cervical cancer vaccine given? The cervical cancer vaccine is a series of 3 injections given within 6 months. You should receive all 3 doses to get full protection. Current data showed that it should be protective for at least 5 years. The need for a booster injection will depend on further research findings and is not yet known. Are there any side effects from the cervical cancer vaccine? The cervical cancer vaccine is generally safe. The common side effects are similar to that from other vaccinations, such as soreness and swelling at the injection site, fever and headache. It should be avoided in pregnancy until more data on the safety in pregnancy are available. HPV vaccine is also not recommended for those who have ever had allergic reaction to any component of HPV vaccine Who should have the cervical cancer vaccine? The cervical cancer vaccine works best for women who have never been exposed to HPV infections. So, it should work best for women who have not started sexual activities. In women who have been sexually active, the effectiveness varies. Please consult your doctor for further information.

Back to Top Previous Next

[Email page to a Friend]