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The Asia Pacific region is home to more than half of the world's 1·93 billion adolescents (aged 10-24 years). Addressing adolescent health in this region is of global importance, but to date a systematic analysis of key contributors to disease in adolescents has not been done, which is a barrier to responsive action.

Australia introduced a hybrid Respiratory Syncytial Virus (RSV) Maternal and Infant Protection Program (RSV-MIPP) in 2025, using National Immunisation Program-funded RSV vaccine for pregnant people from 28 weeks' gestation and jurisdiction-funded nirsevimab. We estimated real-world effectiveness and assessed the impact of the RSV-MIPP program across a participating surveillance network.

The emergence of the SARS-CoV-2 Omicron variant in late 2021 led to widespread infection in Australian children, many unvaccinated. The breadth and magnitude of antibody responses to SARS-CoV-2 variant infections and vaccination in children remain incompletely understood. We aimed to estimate seroprevalence against SARS-CoV-2 spike (S) and nucleocapsid (N) antigens and explore antibody kinetics, focusing on Omicron subvariants.

PICOBOO is a randomised, adaptive trial evaluating the immunogenicity and reactogenicity of licensed COVID-19 booster vaccines in immunocompetent individuals >12 years old. Here, we present data for seven different vaccines among three pre-specified participant strata defined by age and primary vaccine schedule.

Previous research has shown that immune development during the first week of life, i.e. ontogeny, is progressive, consistent and robust, involving large numbers of differentially expressed genes at each sampled time point.

Encephalitis is inflammation of the brain parenchyma with heterogenous aetiology and presentation. In children, it often leads to short-term residual neurological deficits, however clinical predictors of adverse long-term outcome are not fully understood.

Infection Triggered Encephalopathy Syndrome (ITES) is a rare but potentially severe complication of infections in children. ITES is a syndrome of acute encephalopathy that occurs in the context of a febrile illness and hypothesised to result from a cytokine mediated infection-triggered cytotoxicity in the central nervous system (CNS) without parenchymal inflammatory cell infiltration. ITES is considered distinct from infectious and immune-mediated encephalitis. We aimed to describe the demographics, associated pathogens, clinical spectrum and outcomes of ITES in Australian children from May 2013 until June 2024.

Enteroviruses (EVs) have long been implicated in the development of islet autoimmunity (IA) and type 1 diabetes. However, given the ubiquity of EV infections in children, disease susceptibility is likely driven by host-specific immune responses rather than viral exposure alone.

Vaccine hesitancy and suboptimal vaccine uptake pose significant threats to public health, but modifiable psychological factors underpinning them are under-investigated. We examined the prevalence of spontaneous emotional mental imagery relating to infectious diseases and perinatal vaccines and its unique associations with vaccine hesitancy and uptake behaviour.

Bronchiectasis (not related to cystic fibrosis) is a chronic lung disease caused by a range of etiologies but characterized by abnormal airway dilatation, recurrent respiratory symptoms, impaired quality of life and reduced life expectancy.