Table 4.

 Persistent and sequential human papillomavirus (HPV) infections and clearance of HPV infection related to evidence of cervical cytological dyskaryosis at follow up

Follow up cervical cytology result (total no.)	HPV type specific persistent infection	Sequential HPV infection	Clearance of HPV infection	Untypeable* HPV infection
Negative (110)	17	35	55	3
Borderline (3)	1	2	0	0
Mild (9)	7	1	1	0
Moderate (2)	2	0	0	0
Severe (2)	2	0	0	0
All	29	38	56	3

*3 specimens were HPV positive at baseline and follow up but could not be assigned to either HPV persistent or sequential infections because the specific HPV type could not be determined; therefore, they were excluded from subsequent analysis.