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T cells contribute to protection and pathogenesis in tuberculosis. Here the authors sequence T cell receptor repertoires in human skin biopsies from the site of the tuberculin skin test and show enrichment of clonotypes reactive to Mycobacterium tuberculosis using a computational pipeline metaclonotypist to identify distinct TCRs predicted to share peptide-MHC reactivity across participants, as an approach to explore T cell correlates of tuberculosis disease-risk stratification and vaccine efficacy.

Seronegative healthcare workers with an innate signature of infection preferentially expand pre-existing T cells targeting the conserved replication transcription complex of SARS-CoV-2 in abortive infection.

Genome-wide association analyses comprising 14,256 cases and 1,199,156 controls and incorporating correlated cardiac magnetic resonance imaging traits provide insights into the molecular etiology of dilated cardiomyopathy.

Human challenge studies with SARS-CoV-2 have shown changes in the innate and adaptive immune response. Here the authors are examining potential correlates of infection in virus challenged recipients by assessing baseline immune parameters and how this predicts virus control.

Co-infection withMycobacterium tuberculosisis the leading cause of death in individuals infected with HIV-1. In this Review, Bell and Noursadeghi describe the epidemiological associations between the two pathogens, selected interactions of each pathogen with the host and our current understanding of how they affect the pathogenesis of tuberculosis and HIV-1/AIDS in individuals with co-infection.

It’s not always clear whether blood biomarkers are differentially expressed in the time course of viral infections. In this SARS-CoV-2 human challenge study, the authors identify distinct single-gene blood transcriptional biomarkers for early stages of infection or for symptomatic infection.

The risk of developing active tuberculosis (TB) in individuals with latent TB infection is highly variable within and among different risk groups. A personalized risk predictor was developed to better target preventative treatment to individuals at greatest risk, supporting evidence-based clinical decision-making for latent TB.

Human immunodeficiency virus (HIV)-1 is shown here to depend on the recruitment to the HIV-1 capsid of specific cofactors involved in orchestrating nuclear entry and targeting; when these capsid–cofactor interactions are prevented either by virus mutation, cofactor depletion or pharmacological inhibition of cofactor recruitment, viral DNA can be detected by innate immune sensors.

An investigation using various methods reports an association between adeno-associated virus 2 and paediatric hepatitis of unknown aetiology.

Authors utilise a cohort of healthcare workers, infected during the first wave of the SARS-CoV-2 pandemic, to assess symptom persistence and humoral and cellular immunity.

A human SARS-CoV-2 challenge study in individuals without previous exposure to the virus or vaccines provides detailed profiles of local and systemic epithelial and immune cell response dynamics over time and infection status.

Bacterial products in the gut–liver axis and tissue stromal factors can tune liver immunity by driving myeloid instruction of CD8⁺ T cells with immunomodulatory ability.

The SARS-CoV-2 Alpha variant suppresses innate immune responses more effectively than isolates of first-wave SARS-CoV-2, and this is a result of mutations outside of the spike coding region that lead to upregulation of viral innate immune antagonists.

Streptococcus pneumoniae is a common coloniser of the human nasopharynx, but it also causes severe diseases. Here, Weight et al. use an experimental human pneumococcal carriage model to show that bacterial colonisation is associated with invasion of the epithelium and enhancement of immune responses.

Toll-like receptors (TLRs) are an essential component of innate immunity. Here, the authors identify expression quantitative trait loci that are unique to TLR4-stimulation and highlight genes that may have a role in innate immune response.

The treatment of tuberculosis is based on combinations of drugs that directly targetMycobacterium tuberculosis. A new global initiative is now focusing on a complementary approach of developing adjunct host-directed therapies.

A survey of T cell repertoire evolution in the tumors, healthy tissue and blood of patients with early-stage untreated lung cancer offers an opportunity to monitor and identify neoantigen-specific T cells for personalized immunotherapy.

An analysis of 24,202 critical cases of COVID-19 identifies potentially druggable targets in inflammatory signalling (JAK1), monocyte–macrophage activation and endothelial permeability (PDE4A), immunometabolism (SLC2A5 and AK5), and host factors required for viral entry and replication (TMPRSS2 and RAB2A).

T cell responses can be generated to either pathogen infection or from priming with a vaccine. Here the authors compare T cell generation, phenotype and single cell transcriptome of participants vaccinated with a mpox vaccine or infected with the virus showing that the virus induced T cells showed more effective function and phenotype.

A global network of researchers was formed to investigate the role of human genetics in SARS-CoV-2 infection and COVID-19 severity; this paper reports 13 genome-wide significant loci and potentially actionable mechanisms in response to infection.

COVID-19 can be associated with neurological complications. Here the authors show that markers of brain injury, but not immune markers, are elevated in the blood of patients with COVID-19 both early and months after SARS-CoV-2 infection, particularly in those with brain dysfunction or neurological diagnoses.

A genome-wide association study of critically ill patients with COVID-19 identifies genetic signals that relate to important host antiviral defence mechanisms and mediators of inflammatory organ damage that may be targeted by repurposing drug treatments.

Openshaw and colleagues find myeloid inflammation and complement activation signatures in patients with long COVID who were previously hospitalized.