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East, South, and Southeast Asia are key regions in the dissemination of seasonal influenza viruses, but major perturbations (e.g., pandemics) may disrupt their role. Here, the authors demonstrate the impact of the 2009 H1N1 and COVID-19 pandemics on seasonal influenza circulation and evolution within Southeastern Asia.

Lithium tantalate is heterogeneously integrated with silicon photonic integrated circuits via a micro-transfer printing process in a manner fully compatible with existing workflows. A Mach–Zehnder modulator with an insertion loss of 2.9 dB and 70 GHz operation is demonstrated.

In this manuscript, the authors address evolutionary questions on the emergence of SARS-CoV-2. They find that SARS-CoV-2 is not a recombinant of any sarbecoviruses detected to date, and that the bat and pangolin sequences most closely related to SARS-CoV-2 probably diverged several decades ago or possibly earlier from human SARS-CoV-2 samples.

Fur farming represents an important hub of cross-species transmission for viral zoonoses.

This study on respiratory syncytial virus (RSV) reveals global genomic gaps. Using INFORM-RSV data, it uncovers selection’s impact on RSVA and RSVB diversity. Analysing full genomes, it highlights non-neutral epidemic processes. The research emphasises air travel’s influence on global spread, underscoring the need for comprehensive RSV genomic surveillance.

Frequent dispersal and short-lived local transmission clusters fuelled the 2013–2016 Ebola virus epidemic in Guinea, Liberia and Sierra Leone.

In many European countries, more than half of the SARS-CoV-2 lineages circulating in late summer 2020 resulted from new introductions, highlighting the threat of viral dissemination when restrictions are lifted.

For archival pathogens, like pH1N1 Influenza A virus the causative agent of 1918/19 pandemic, only few whole genome sequences exist. Here, Patrono et al. provide one complete and two partial genomes from Germany and find variation in two sites in the nucleoprotein gene in pandemic samples compared to pre-pandemic samples, that are associated with resistance to host antiviral response, pointing at a possible viral adaptation to humans.

Spatiotemporal sampling gaps in existing pathogen genomic data limits their use in understanding epidemiological patterns. Here, the authors apply a phylogeographic approach with SARS-CoV-2 genomes to accurately reproduce pathogen spread by accounting for spatial biases and travel history of the individual.

Monkeypox virus genomic data from Nigeria and Cameroon, sampled between 2018 and 2023, indicate that the virus spread through repeated zoonoses in Cameroon, whereas in Nigeria, it spread mainly through human–human transmission, predominantly originating in Rivers State.

The analysis of more than 9,000 haemagglutinin sequences of human seasonal influenza viruses over a 12-year time period shows that the global circulation patterns of A/H1N1 and B viruses are different from those of the well characterised A/H3N2 viruses; in particular the A/H1N1 and B viruses are shown to persist locally across several seasons and do not display the same degree of global movement as the H3N2 viruses.

Analysis of genomic and epidemiology data from 2022 in New York City show similarities between the dynamics of MPXV and HIV transmission, and highlight the role of heavy-tailed sexual contact networks in disease transmission.

Here, the authors detect clade 2.3.4.4b H5N1 viruses in elephant seals associated with a mass mortality event in Argentina, show that the viruses belong to a clade primarily seen in marine mammals in South America and that they carry mammal-adaptation mutations suggestive of potential mammal-to-mammal transmission.

The SARS-CoV-2 Alpha variant of concern emerged in the UK in late 2020 but spread internationally before it was detected. Here, the authors reconstruct the dynamics of dissemination of this variant out of the UK by combining extent of genomic sequencing, travel volume, and local epidemic dynamics in a Bayesian model.

Genomic surveillance has been important for tracking the evolution and spread of SARS-CoV-2. Here, the authors analyse ~300,000 SARS-CoV-2 genomes from two years of sequencing in the Latin America and Caribbean regions and describe the emergence and spread of different lineages over time.

White-tailed deer are an important reservoir of SARS-CoV-2 in the USA and continued monitoring of the virus in deer populations is needed. In this genomic epidemiology study from Ohio, the authors show that the virus has been introduced multiple times to deer from humans, and that it has evolved faster in deer.

Currently licensed COVID-19 vaccines are based on antigen sequences of early SARS-CoV-2 isolates, despite the prevalence of variants of concerns escaping vaccine-mediated protection. Using their updated yellow fever 17D vectored candidate, here, authors assess neutralising antibody responses against variants of concern, and demonstrate protection and reduced transmission in a hamster model.

The viral lineage responsible for the February 2021 outbreak of Ebola virus disease in Guinea is nested within a clade that predominantly consists of genomes sampled during the 2013–2016 epidemic, suggesting that the virus might have re-emerged after a long period of latency within a previously infected individual.

Analysis of individual-level patient records from Brazil reveals that the extensive shocks in COVID-19 mortality rates are associated with pre-pandemic geographic inequities as well as shortages in healthcare capacity during the pandemic.

Heeren et al study the evolutionary genomics of leishmaniasis in Peru and Bolivia to show that parasite hybridization increases the prevalence, diversity and spread of viruses that have been previously associated with disease severity and treatment failure.

Classical epidemiological approaches have been limited in their ability to formally test hypotheses. Here, Dellicour et al. illustrate how phylodynamic and phylogeographic analyses can be leveraged for hypothesis testing in molecular epidemiology using West Nile virus in North America as an example.

The role of Africa in the global spread of highly pathogenic avian influenza (HPAI) is not well understood. Here, using evolutionary analyses, the authors show that Africa mainly acts as ecological sink for HPAI H5, and reveal varying paths of HPAI incursions either through domestic or wild birds.

BEAST X advances Bayesian phylogenetic, phylogeographic and phylodynamic analysis by incorporating a broad range of complex models and leveraging advanced algorithms and techniques to boost statistical inference.

It is currently unknown how climate and land use changes could affect the endemic area of Lassa virus, a zoonotic pathogen responsible for Lassa fever. Here, the authors show that by 2070, new regions in Africa will likely become ecologically suitable for Lassa virus, drastically increasing the population living in conditions favourable for virus circulation.

During the last Ebola virus outbreak in West Africa, a large amount of viral genomic data was obtained. Here, Dellicour et al. use phylodynamic approaches to assess effect of intervention strategies such as border closures.

The 2009 H1N1 influenza pandemic exposed major gaps in our knowledge of the spatial ecology and evolution of swine influenza A viruses. Here Nelson et al. perform an extensive phylogenetic analysis of these viruses and show that the global trade of live swine strongly predicts their spatial dissemination.

Truong Nguyen, Kant, Van den Broeck et al. report the SARS-CoV-2 lineages circulating in Finland in 2020. Phylogeographic analysis suggests that 42 independent SARS-CoV-2 introductions into Finland occurred, with a single introduction seeding one third of cases in the spring.

A study of the early genetic diversity and history of the HIV-1 epidemic in North America through sequencing of eight full-length viral genomes from the 1970s.

Gallego García et al. trace the entry and spread of SARS-CoV-2 Alpha, Delta, and Omicron BA.1 into Spain. The main route of entry is via France, the United Kingdom, and Germany, underscoring the importance of travel restrictions in outbreak management.

The first genome and continent-wide study of Leishmania braziliensis across South America reveals eco-epidemiologically distinct genetic groups in the Amazon and Atlantic Forests, offering new insights into the pathogen’s evolutionary history.

Similarity of antibody responses in HIV-1 transmission pairs reveals a significant impact of the virus genome on imprinting antibody responses.

This Review Article describes how recent advances in viral genome sequencing and phylogenetics have enabled key issues associated with outbreak epidemiology to be more accurately addressed, and highlights the requirements and challenges for generating, sharing and using such data when tackling a viral outbreak.

During the COVID-19 pandemic, genomics and bioinformatics have emerged as essential public health tools. The genomic data acquired using these methods have supported the global health response, facilitated the development of testing methods and allowed the timely tracking of novel SARS-CoV-2 variants. Yet the virtually unlimited potential for rapid generation and analysis of genomic data is also coupled with unique technical, scientific and organizational challenges. Here, we discuss the application of genomic and computational methods for efficient data-driven COVID-19 response, the advantages of the democratization of viral sequencing around the world and the challenges associated with viral genome data collection and processing.