Work

Assessing B19V epidemiology and viremia dynamics in plasma donors: A comprehensive analysis

Year: 2025

Type: article

Abstract: Parvovirus B19 (B19V) infection is characterized by measurable bloodstream biomarkers, which vary over time indicating different phases of infection. High B19V DNA levels in the bloodstream are associated with infectivity, impacting the eligibility of source plasma donors. Characterize temporal changes in B19V epidemiological rates from January 2018 to April 2025 and to investigate the longitudinal dynamics of the diagnostic biomarkers and infectivity in subclinical infections among US source plasma donors. B19V positivity rates in CSL’s US source plasma donors decreased to a very low level during the COVID-19 pandemic and until Spring 2023 and re-emerged in two waves with peak rates ≥2.2-fold higher compared to pre-COVID data (2018 – 2020). During the exponential infection phase, B19V DNA doubled every 3-5 hours, leading to high titers up to 10^12 IU/mL and peak infectivity of ~10^8 TCID 50 /mL. Infectivity ceased when anti-B19V IgG reached a plateau or 14 days after DNA titer dropped below 4.8×10^5 IU/mL. The re-emergence of B19V with high positivity rates highlights the relevance of donation testing for plasma. During the month from infection onset, B19V DNAemia correlates well with the measured infectious titer. B19V infectivity in plasma disappears within a month while DNA can persist in the plasma in absence of detectable infectivity, likely due to the immune response as characterized by the immunological markers. • Parvovirus B19 rate in US plasma donors fell during COVID then surged in two waves. • Parvovirus B19 DNA doubles every 3-5 hours during the exponential infection phase. • No naked parvovirus B19 DNA is seen in plasma during the early infection phase. • Parvovirus B19 infectivity ceases once the anti-B19V IgG level reaches a plateau.

Source: Journal of Clinical Virology

DOI: 10.1016/j.jcv.2025.105873