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Legionella pneumophila was first isolated as the causative agent of a deadly infectious pneumonia at a convention of the American Legion forty years ago. Since then, Legionnaires’ disease continues to be a significant public health concern. Today, our understanding of the Legionella genus, comprising environmental bacteria and opportunistic human pathogens, has dramatically increased. The study of how pathogenic Legionella interact with host cells, both protozoan and mammalian, has not only taught us about host-pathogen interactions but has revealed novel and unexpected insights into human cell biology and immunology. The capacity of pathogenic Legionella to commandeer cellular processes such as eukaryotic vesicular trafficking to establish an ER-like replicative niche, reflects the exquisite ability of this pathogen to manipulate eukaryotic cell biology in order to replicate in an intracellular compartment. This requires the specific and targeted action of a cohort of translocated bacterial effector proteins. In addition, we have learnt much about cell autonomous innate immune sensing of intracellular bacteria through the inability of L. pneumophila to avoid intracellular mammalian defense mechanisms. Now, in the age of large-scale comparative “omics”, it is clear that different Legionella species utilize different cohorts of effectors to replicate inside eukaryotic cells. While we understand some of the strategies employed by L. pneumophila and L. longbeachae to replicate within eukaryotic cells, there is still much to learn about many aspects of the Legionella life cycle. This Research Topic highlights the latest findings regarding the biology of Legionella species, their interactions with eukaryotic host cells, and how the application of various technologies has increased our understanding of this important pathogen.

Host-Pathogen Interactions --- Legionnaires' Disease --- Legionella --- Dot/Icm effector --- intravacuolar pathogen

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Legionella pneumophila is an emerging human pathogen that resides in natural environments as a parasite of freshwater. There have been new developments in this field including the publication of three whole genome sequences, the discovery of a developmental cycle and novel cyst-like highly infectious form, and the bacteria have been used as a probe for macrophage cellular function to unravel fundamental new knowledge in the area of cellular biology. Legionella has also become a model system for the study of innate as well as adaptive immunity. Information on Legionella continues to increase in the U.S. and abroad. Columbia University has started the first Legionella Genome Project with a multi-million dollar grant from the NIH. In addition, The European Working Group for Legionella infections was formed in 1986. Members are scientists with an interest in improving knowledge and information on the clinical and environmental aspects of legionnaires' disease through developments in diagnosis, management and treatment of the disease. The volume brings together all of the latest research on this pathogen, the interest in which is rapidly growing.

Legionella pneumophila. --- Legionnaires' disease bacterium --- Life sciences. --- Immunology. --- Infectious diseases. --- Microbiology. --- Life Sciences. --- Infectious Diseases. --- Legionella --- Emerging infectious diseases. --- Emerging infections --- New infectious diseases --- Re-emerging infectious diseases --- Reemerging infectious diseases --- Communicable diseases --- Immunobiology --- Life sciences --- Serology --- Microbial biology --- Biology --- Microorganisms

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Climate change poses a serious challenge to our health and wellbeing. The increasing frequency of extreme weather events such as floods, droughts, and heatwaves, and the direct impacts of changes in temperature have direct impacts on health. At the same time, broader environmental change affects infectious disease risk, air pollution, and other forms of exposure. The different ways in which climate change will affect health are complex, interactive, and different communities are disproportionately affected. International actions such as the Paris Agreement and the Sustainable Development Goals recognise the future risks to society and acknowledge that we are already committed to a certain level of climate change. Future adaptation measures therefore need careful assessment and implementation for us to be able to minimise the potential risks from climate change and, at the same time, maximise the potential health benefits of a cleaner, greener world. This Special Issue comprises original research articles and detailed reviews on the likely impacts of climate change on health in a range of geographical settings, and the potential for adaptation measures to reduce some of these risks. Ultimately, studies like these will motivate policy level action for mitigation and help in determining the most effective methods of adaptation to reduce negative impacts in future through embedding scientific evidence into practice.

Research & information: general --- heat-waves --- heat-related mortality --- 2003 --- 2015 --- climate change --- Germany --- air temperature --- hot days --- heat waves --- city --- urban area types --- Poznań --- Poland --- ambulance 999 calls --- extreme weather --- resource planning --- London --- UK --- heat --- mortality --- adaptation --- dwellings --- indoor temperature --- cold days --- cold waves --- health systems --- climate adaptation --- health infrastructure --- rescue services --- Northern Europe --- disaster risk reduction --- Sendai Framework --- demographic change --- infectious diseases --- vector-borne diseases --- aerosolized exposures --- pollen --- well-being --- public health --- land management --- patient and public involvement (PPI) --- land-use --- El Niño Southern Oscillation --- ENSO --- health --- climatic variability --- climate-sensitive disease --- workplace --- heat stress --- productivity loss --- beta distribution --- North Atlantic Oscillation --- weather --- emergency ambulance calls --- exacerbation of essential hypertension --- urban heat island --- urban planning --- heat resilience --- climate scenarios --- waterborne disease --- natural environment --- risks --- cryptosporidiosis --- cholera --- leptospirosis --- Legionnaires’ disease --- trends over time --- n/a --- Poznań --- El Niño Southern Oscillation --- Legionnaires' disease