Current concepts on human papillomavirus infections in children

Area of Science:

• Virology
• Epidemiology
• Pediatrics

Background:

• Human papillomavirus (HPV) transmission routes, particularly in children, remain a focus of research.
• Evidence suggests both sexual and non-sexual transmission of HPV.
• Prenatal HPV infection is indicated by viral DNA detection in various maternal and fetal tissues.

Purpose of the Study:

• To review current evidence on HPV transmission modes in infants and children.
• To discuss the implications of HPV epidemiology for public health strategies, including vaccination.

Main Methods:

• Review of existing literature and meta-analyses on HPV transmission.
• Analysis of HPV DNA detection in prenatal samples (amniotic fluid, fetal membranes, cord blood, placenta).
• Examination of epidemiological data for HPV-related conditions like skin warts, oral papillomas, and recurrent respiratory papillomatosis (RRP).

Main Results:

• Prenatal transmission of HPV occurs in approximately 20% of cases.
• Mothers are the primary transmitters to newborns; horizontal transmission via saliva and contact is also significant.
• Persistent oral and genital HPV infections in infants are relatively low (<10% and <2% respectively).
• Bimodal prevalence for skin warts, oral papillomas, and RRP suggests consistent epidemiological patterns across age groups.
• HPV genotypes 6 and 11 are most common in juvenile-onset RRP and genital warts.

Conclusions:

• Current evidence supports both sexual and non-sexual HPV transmission, including prenatal routes.
• Understanding HPV transmission dynamics in early life is crucial for developing effective HPV vaccination strategies.
• Juvenile-onset RRP and genital condylomata present significant clinical challenges, with implications for early detection and management.