The frequency of HPV genotypes in Zambia as compared to the worldwide HPV distribution. The worldwide HPV data was adapted from Clifford et al. (2005) and Peyton et al. (2001)  . Both HPV16 and HPV18 were present at 21.6% compared to 14% and 5%, for HPV16 and HPV18, respectively.
Ng'andwe et al. BMC Infectious Diseases 2007 7:77 doi:10.1186/1471-2334-7-77