Seroprevalence of Antibodies Against Legionella Species in Northeastern Australian Blood Donors, 2016 and 2023.

ABSTRACT:

Background

In 2021-2022, Queensland, Australia observed an increase in Legionnaire's disease cases, predominantly due to Legionella longbeachae. This study assessed seroprevalence at time points 2016 and 2023, representing before and after the higher incidence and explored if demographic, environmental and geographical factors associated with legionellosis seroprevalence.

Methods

A total of 1001 human plasma samples (496 from 2016/505 from 2023) were analysed for the presence of Legionella antibodies (IgG) using indirect immunofluorescence assays. Primary screens detected IgG to L. pneumophila serogroups (SG) 1-6, SG 7-14, or "other" Legionella spp. Samples positive for "other" underwent secondary screening for L. longbeachae SG 1 and 2. A chi-square test assessed associatio

SUBMITTER: Lethbridge J 

PROVIDER: S-EPMC12811873 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature