Parainfluenza Virus Infection in an Australian Community-based Birth Cohort

Area of Science:

• Pediatric infectious diseases
• Virology
• Epidemiology

Background:

• Human parainfluenza viruses (HPIVs) are significant respiratory pathogens in infants and young children.
• Understanding the incidence and epidemiology of HPIV in community settings is crucial for public health planning.

Purpose of the Study:

• To determine the incidence rate and seasonal patterns of human parainfluenza virus (HPIV) infections in a cohort of Australian infants.
• To identify the dominant HPIV subtypes and characterize the clinical presentation and healthcare utilization associated with HPIV episodes.

Main Methods:

• A community-based birth cohort study followed 158 Australian infants until age 2 years.
• Data on HPIV detection, seasonality, subtype, and clinical outcomes including healthcare contact and hospitalization were collected.

Main Results:

• The incidence rate of HPIV was 0.42 episodes per child-year.
• HPIV episodes occurred year-round, with a peak incidence during the spring season. Human parainfluenza virus 3 (HPIV-3) was the most prevalent subtype.
• Forty-one percent of HPIV detections were asymptomatic, and only 32% of episodes resulted in healthcare contact, with one hospitalization.

Conclusions:

• Human parainfluenza virus (HPIV) infections represent a common occurrence in young Australian children.
• The findings highlight the year-round burden of HPIV, particularly HPIV-3, and the generally mild clinical course, with a low rate of healthcare utilization.