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"Viruses."
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Knaves over queens
As the alien Xenovirus reaches Britain, Prime Minister Sir Winston Churchill, now gifted with extraordinary longevity, joins with Alan Turing to set up a special organization, the Order of the Silver Helix, to outmaneuver the terrifying mutations of the virus in Britain.
Book
Genesis and pathogenesis of the 1918 pandemic H1N1 influenza A virus
The source, timing, and geographical origin of the 1918–1920 pandemic influenza A virus have remained tenaciously obscure for nearly a century, as have the reasons for its unusual severity among young adults. Here, we reconstruct the origins of the pandemic virus and the classic swine influenza and (postpandemic) seasonal H1N1 lineages using a host-specific molecular clock approach that is demonstrably more accurate than previous methods. Our results suggest that the 1918 pandemic virus originated shortly before 1918 when a human H1 virus, which we infer emerged before ∼1907, acquired avian N1 neuraminidase and internal protein genes. We find that the resulting pandemic virus jumped directly to swine but was likely displaced in humans by ∼1922 by a reassortant with an antigenically distinct H1 HA. Hence, although the swine lineage was a direct descendent of the pandemic virus, the post-1918 seasonal H1N1 lineage evidently was not, at least for HA. These findings help resolve several seemingly disparate observations from 20th century influenza epidemiology, seroarcheology, and immunology. The phylogenetic results, combined with these other lines of evidence, suggest that the high mortality in 1918 among adults aged ∼20 to ∼40 y may have been due primarily to their childhood exposure to a doubly heterosubtypic putative H3N8 virus, which we estimate circulated from ∼1889–1900. All other age groups (except immunologically naive infants) were likely partially protected by childhood exposure to N1 and/or H1-related antigens. Similar processes may underlie age-specific mortality differences between seasonal H1N1 vs. H3N2 and human H5N1 vs. H7N9 infections.
Journal Article
The Histories of HIVs
This new collection of essays on HIV viruses spans disciplines to topple popular narratives about the origins of the AIDS pandemic and the impact of the disease on public health policy.
With a death toll in the tens of millions, the AIDS pandemic was one of the worst medical disasters of the past century. The disease was identified in 1981, at the height of miraculous postwar medical achievements, including effective antibiotics, breakthrough advances in heart surgery and transplantations, and cheap, safe vaccines—smallpox had been eradicated just a few years earlier. Arriving as they did during this era of confidence in modern medicine, the HIV epidemics shook the public’s faith in health science. Despite subsequent success in identifying, testing, and treating AIDS, the emergence of epidemics and outbreaks of Ebola, Zika, and the novel coronaviruses (SARS and COVID-19) are stark reminders that such confidence in modern medicine is not likely to be restored until the emergence of these viruses is better understood.
This collection combines the work of major social science and humanities scholars with that of virologists and epidemiologists to provide a broader understanding of the historical, social, and cultural circumstances that produced the pandemic. The authors argue that the emergence of the HIV viruses and their epidemic spread were not the result of a random mutation but rather broader new influences whose impact depended upon a combination of specific circumstances at different places and times. The viruses emerged and were transmitted according to population movement and urbanization, changes in sexual relations, new medical procedures, and war. In this way, the AIDS pandemic was not a chance natural occurrence, but a human-made disaster.
Essays by: Ernest M. Drucker, Tamara Giles-Vernick, Ch. Didier Gondola, Guillaume Lachenal, Amandine Lauro, Preston A. Marx, Stephanie Rupp, François Simon, Jorge Varanda
eBook
Mississippi roll
Now on its final voyage, the historical steamboat Natchez is known for her super-powered guest entertainers. But after the suspicious death of a crew member, retired NY police detective Leo Storgman decides to make this incident his personal case. His findings only lead to a growing number of questions. Is there some truth behind the ghostly sightings of the steamboat's first captain Wilbur Leathers? What secret does the current captain seem to be hiding? And could the Natchez be ferrying mysterious - and possibly dangerous - cargo onboard?
Book
Imaging, Tracking and Computational Analyses of Virus Entry and Egress with the Cytoskeleton
Viruses have a dual nature: particles are \"passive substances\" lacking chemical energy transformation, whereas infected cells are \"active substances\" turning-over energy. How passive viral substances convert to active substances, comprising viral replication and assembly compartments has been of intense interest to virologists, cell and molecular biologists and immunologists. Infection starts with virus entry into a susceptible cell and delivers the viral genome to the replication site. This is a multi-step process, and involves the cytoskeleton and associated motor proteins. Likewise, the egress of progeny virus particles from the replication site to the extracellular space is enhanced by the cytoskeleton and associated motor proteins. This overcomes the limitation of thermal diffusion, and transports virions and virion components, often in association with cellular organelles. This review explores how the analysis of viral trajectories informs about mechanisms of infection. We discuss the methodology enabling researchers to visualize single virions in cells by fluorescence imaging and tracking. Virus visualization and tracking are increasingly enhanced by computational analyses of virus trajectories as well as in silico modeling. Combined approaches reveal previously unrecognized features of virus-infected cells. Using select examples of complementary methodology, we highlight the role of actin filaments and microtubules, and their associated motors in virus infections. In-depth studies of single virion dynamics at high temporal and spatial resolutions thereby provide deep insight into virus infection processes, and are a basis for uncovering underlying mechanisms of how cells function.
Journal Article
Human papillomavirus and cervical cancer
Summary Cervical cancer is caused by human papillomavirus infection. Most human papillomavirus infection is harmless and clears spontaneously but persistent infection with high-risk human papillomavirus (especially type 16) can cause cancer of the cervix, vulva, vagina, anus, penis, and oropharynx. The virus exclusively infects epithelium and produces new viral particles only in fully mature epithelial cells. Human papillomavirus disrupts normal cell-cycle control, promoting uncontrolled cell division and the accumulation of genetic damage. Two effective prophylactic vaccines composed of human papillomavirus type 16 and 18, and human papillomavirus type 16, 18, 6, and 11 virus-like particles have been introduced in many developed countries as a primary prevention strategy. Human papillomavirus testing is clinically valuable for secondary prevention in triaging low-grade cytology and as a test of cure after treatment. More sensitive than cytology, primary screening by human papillomavirus testing could enable screening intervals to be extended. If these prevention strategies can be implemented in developing countries, many thousands of lives could be saved.
Journal Article
Current challenges and implications for dengue, chikungunya and Zika seroprevalence studies worldwide: A scoping review
Arboviral infections are a public health concern and an escalating problem worldwide. Estimating the burden of these diseases represents a major challenge that is complicated by the large number of unapparent infections, especially those of dengue fever. Serological surveys are thus required to identify the distribution of these diseases and measure their impact. Therefore, we undertook a scoping review of the literature to describe and summarize epidemiological practices, findings and insights related to seroprevalence studies of dengue, chikungunya and Zika virus, which have rapidly expanded across the globe in recent years.
Relevant studies were retrieved through a literature search of MEDLINE, WHOLIS, Lilacs, SciELO and Scopus (2000 to 2018). In total, 1389 publications were identified. Studies addressing the seroprevalence of dengue, chikungunya and/or Zika written in English or French and meeting the inclusion and exclusion criteria were included. In total, 147 studies were included, from which 185 data points were retrieved, as some studies used several different samples. Most of the studies were exclusively conducted on dengue (66.5%), but 16% were exclusively conducted on chikungunya, and 7 were exclusively conducted on Zika; the remainder were conducted on multiple arboviruses. A wide range of designs were applied, but most studies were conducted in the general population (39%) and in households (41%). Although several assays were used, enzyme-linked immunosorbent assays (ELISAs) were the predominant test used (77%). The temporal distribution of chikungunya studies followed the virus during its rapid expansion since 2004. The results revealed heterogeneity of arboviruses seroprevalence between continents and within a given country for dengue, chikungunya and Zika viruses, ranging from 0 to 100%, 76% and 73% respectively.
Serological surveys provide the most direct measurement for defining the immunity landscape for infectious diseases, but the methodology remains difficult to implement. Overall, dengue, chikungunya and Zika serosurveys followed the expansion of these arboviruses, but there remain gaps in their geographic distribution. This review addresses the challenges for researchers regarding study design biases. Moreover, the development of reliable, rapid and affordable diagnosis tools represents a significant issue concerning the ability of seroprevalence surveys to differentiate infections when multiple viruses co-circulate.
Journal Article