scholarly journals An emerging viral pathogen truncates population age structure in a European amphibian and may reduce population viability

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5949 ◽  
Author(s):  
Lewis J. Campbell ◽  
Trenton W.J. Garner ◽  
Giulia Tessa ◽  
Benjamin C. Scheele ◽  
Amber G.F. Griffiths ◽  
...  
Keyword(s):  
Infectious Diseases ◽  
Age Structure ◽  
Rana Temporaria ◽  
Emerging Infectious Diseases ◽  
Adult Mortality ◽  
Population Declines ◽  
Viral Pathogen ◽  
Historical Presence ◽  
Population Demographic ◽  
The Impact

Infectious diseases can alter the demography of their host populations, reducing their viability even in the absence of mass mortality. Amphibians are the most threatened group of vertebrates globally, and emerging infectious diseases play a large role in their continued population declines. Viruses belonging to the genus Ranavirus are responsible for one of the deadliest and most widespread of these diseases. To date, no work has used individual level data to investigate how ranaviruses affect population demographic structure. We used skeletochronology and morphology to evaluate the impact of ranaviruses on the age structure of populations of the European common frog (Rana temporaria) in the UK. We compared ecologically similar populations that differed most notably in their historical presence or absence of ranavirosis (the acute syndrome caused by ranavirus infection). Our results suggest that ranavirosis may truncate the age structure of R. temporaria populations. One potential explanation for such a shift might be increased adult mortality and subsequent shifts in the life history of younger age classes that increase reproductive output earlier in life. Additionally, we constructed population projection models which indicated that such increased adult mortality could heighten the vulnerability of frog populations to stochastic environmental challenges.

scholarly journals An emerging viral pathogen truncates population age structure in a European amphibian and may reduce population viability

2018 ◽  
Author(s):  
Lewis J Campbell ◽  
Trenton W J Garner ◽  
Giulia Tessa ◽  
Benjamin C Scheele ◽  
Amber G F Griffiths ◽  
...  
Keyword(s):  
Infectious Diseases ◽  
Age Structure ◽  
Rana Temporaria ◽  
Emerging Infectious Diseases ◽  
Adult Mortality ◽  
Population Declines ◽  
Viral Pathogen ◽  
Historical Presence ◽  
Population Demographic ◽  
The Impact

Infectious diseases can alter the demography of their host populations, reducing their viability even in the absence of mass mortality. Amphibians are the most threatened group of vertebrates globally, and emerging infectious diseases play a large role in their continued population declines. Viruses belonging to the genus Ranavirus are responsible for one of the deadliest and most widespread of these diseases. To date, no work has used individual level data to investigate how ranaviruses affect population demographic structure. We used skeletochronology and morphology to evaluate the impact of ranaviruses on the age structure of populations of the European common frog (Rana temporaria) in the United Kingdom. We compared ecologically similar populations that differed only in their historical presence or absence of ranavirosis (the acute syndrome caused by ranavirus infection). Our results suggest that ranavirosis may truncate the age structure of R. temporaria populations. One potential explanation for such a shift might be increased adult mortality and subsequent shifts in the life history of younger age classes that increase reproductive output earlier in life. Additionally we constructed population projection models which indicated that such increased adult mortality could heighten the vulnerability of frog populations to stochastic environmental challenges.

scholarly journals An emerging viral pathogen truncates population age structure in a European amphibian and may reduce population viability

2018 ◽  
Author(s):  
Lewis J Campbell ◽  
Trenton W J Garner ◽  
Giulia Tessa ◽  
Benjamin C Scheele ◽  
Amber G F Griffiths ◽  
...  
Keyword(s):  
Infectious Diseases ◽  
Age Structure ◽  
Rana Temporaria ◽  
Emerging Infectious Diseases ◽  
Adult Mortality ◽  
Population Declines ◽  
Viral Pathogen ◽  
Historical Presence ◽  
Population Demographic ◽  
The Impact

Infectious diseases can alter the demography of their host populations, reducing their viability even in the absence of mass mortality. Amphibians are the most threatened group of vertebrates globally, and emerging infectious diseases play a large role in their continued population declines. Viruses belonging to the genus Ranavirus are responsible for one of the deadliest and most widespread of these diseases. To date, no work has used individual level data to investigate how ranaviruses affect population demographic structure. We used skeletochronology and morphology to evaluate the impact of ranaviruses on the age structure of populations of the European common frog (Rana temporaria) in the United Kingdom. We compared ecologically similar populations that differed only in their historical presence or absence of ranavirosis (the acute syndrome caused by ranavirus infection). Our results suggest that ranavirosis may truncate the age structure of R. temporaria populations. One potential explanation for such a shift might be increased adult mortality and subsequent shifts in the life history of younger age classes that increase reproductive output earlier in life. Additionally we constructed population projection models which indicated that such increased adult mortality could heighten the vulnerability of frog populations to stochastic environmental challenges.

scholarly journals Disease mediated changes to life history and demography threaten the survival of European amphibian populations

2017 ◽  
Author(s):  
Lewis J. Campbell ◽  
Trenton W. J. Garner ◽  
Giulia Tessa ◽  
Benjamin C. Scheele ◽  
Amber G.F. Griffiths ◽  
...  
Keyword(s):  
Life History ◽  
Infectious Diseases ◽  
Rana Temporaria ◽  
Life History Strategy ◽  
Adult Mortality ◽  
Population Declines ◽  
Individual Level ◽  
Historical Presence ◽  
Population Demographic ◽  
The Impact

AbstractInfectious diseases can influence the life history strategy of their hosts and such influences subsequently impact the demography of infected populations, reducing viability independently of increased mortality or morbidity. Amphibians are the most threatened group of vertebrates and emerging infectious diseases play a large role in their population declines. Viruses of genus Ranavirus are responsible for one of the deadliest of these diseases. To date no work has evaluated the impact of ranaviruses on host life-history post metamorphosis or population demographic structure at the individual level. In this study, we used skeletochronology and morphology to evaluate the impact of ranaviruses on the demography of populations of European common frog (Rana temporaria) in the United Kingdom. We compared ecologically similar populations that differed only in their historical presence or absence of ranaviral disease. Our results suggest that ranaviruses are associated with shifts in the age structure of infected populations, potentially caused by increased adult mortality and associated shifts in the life history of younger age classes. Population projection models indicate that such age truncation could heighten the vulnerability of frog populations to stochastic environmental challenges. Our individual level data provide further compelling evidence that the emergence of infectious diseases can alter host demography, subsequently increasing population vulnerability to additional stressors.

Awareness of symptomatic differences Covid-19, SARS, Swine Flu, Common cold among dental students

2020 ◽  
Vol 11 (SPL1) ◽  
pp. 1026-1033
Author(s):  
Nivedha Valliammai Mahalingam ◽  
Abilasha R ◽  
Kavitha S
Keyword(s):  
Infectious Diseases ◽  
Undergraduate Students ◽  
Common Cold ◽  
Emerging Infectious Diseases ◽  
Dental Students ◽  
Swine Flu ◽  
Viral Diseases ◽  
Surveillance Systems ◽  
Cross Sectional ◽  
The Impact

Enormous successes have been obtained against the control of major epidemic diseases, such as SARS, MERS, Ebola, Swine Flu in the past. Dynamic interplay of biological, socio-cultural and ecological factors, together with novel aspects of human-animal interphase, pose additional challenges with respect to the emergence of infectious diseases. The important challenges faced in the control and prevention of emerging and re-emerging infectious diseases range from understanding the impact of factors that are necessary for the emergence, to development of strengthened surveillance systems that can mitigate human suffering and death. The aim of the current study is to assess the awareness of symptomatic differences between viral diseases like COVID-19, SARS, Swine flu and common cold among dental students that support the prevention of emergence or re-emergence. Cross-sectional type of study conducted among the undergraduate students comprising 100 Subjects. A questionnaire comprising 15 questions in total were framed, and responses were collected in Google forms in SPSS Software statistical analysis. The study has concluded that dental students have an awareness of the symptomatic differences between infectious viral disease. The study concluded that the awareness of symptomatic differences between viral diseases like COVID-19, SARS, Swine flu, Common cold is good among the dental students who would pave the way for early diagnosis and avoid spreading of such diseases. A further awareness can be created by regular webinars, seminars and brainstorming sessions among these healthcare professionals.

scholarly journals Live wildlife trade in markets - a scoping review to inform risk assessment of emerging infectious diseases

2021 ◽  
Author(s):  
Victoria J Brookes ◽  
Okta Wismandanu ◽  
Etih Sudarnika ◽  
Justin A Roby ◽  
Lynne Hayes ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Infectious Diseases ◽  
Scoping Review ◽  
Epistemic Uncertainty ◽  
Mammalian Species ◽  
Emerging Infectious Diseases ◽  
World Health Organisation ◽  
World Health ◽  
Wildlife Trade ◽  
The Impact

Wet markets are important for food security in many regions worldwide but have come under scrutiny due to their potential role in the emergence of infectious diseases. The sale of live wildlife has been highlighted as a particular risk, and the World Health Organisation has called for the banning of live, wild-caught mammalian species in markets unless risk assessment and effective regulations are in place. Following PRISMA guidelines, we conducted a global scoping review of peer-reviewed information about the sale of live, terrestrial wildlife in markets that are likely to sell fresh food, and collated data about the characteristics of such markets, activities involving live wildlife, the species sold, their purpose, and animal, human, and environmental health risks that were identified. Of the 59 peer-reviewed records within scope, only 25% (n = 14) focussed on disease risks; the rest focused on the impact of wildlife sale on conservation. Although there were some global patterns (for example, the types of markets and purpose of sale of wildlife), there was wide diversity and huge epistemic uncertainty in all aspects associated with live, terrestrial wildlife sale in markets such that the feasibility of accurate assessment of the risk of emerging infectious disease associated with live wildlife trade in markets is limited. Given the value of both wet markets and wildlife trade and the need to support food affordability and accessibility, conservation, public health, and the social and economic aspects of livelihoods of often vulnerable people, there are major information gaps that need to be addressed to develop evidence-based policy in this environment. This review identifies these gaps and provides a foundation from which information for risk assessments can be collected.

scholarly journals The impact of export regulations on recombinant viral vaccine development for emerging infectious diseases

Vaccine ◽  
2020 ◽  
Vol 38 (46) ◽  
pp. 7198-7200
Author(s):  
Jayanthi Wolf ◽  
Ryan Hansen ◽  
Kimberly Hassis ◽  
William Lapps ◽  
Emese Warmuth
Keyword(s):  
Infectious Diseases ◽  
Vaccine Development ◽  
Emerging Infectious Diseases ◽  
Viral Vaccine ◽  
The Impact

scholarly journals Rickettsioses as paradigms of new or emerging infectious diseases.

1997 ◽  
Vol 10 (4) ◽  
pp. 694-719 ◽  
Author(s):  
D Raoult ◽  
V Roux
Keyword(s):  
Molecular Biology ◽  
Infectious Diseases ◽  
Emerging Infectious Diseases ◽  
Unknown Etiology ◽  
Pathogenic Potential ◽  
Laboratory Methods ◽  
Rickettsia Species ◽  
Intracellular Location ◽  
The Impact

Rickettsioses are caused by species of Rickettsia, a genus comprising organisms characterized by their strictly intracellular location and their association with arthropods. Rickettsia species are difficult to cultivate in vitro and exhibit strong serological cross-reactions with each other. These technical difficulties long prohibited a detailed study of the rickettsiae, and it is only following the recent introduction of novel laboratory methods that progress in this field has been possible. In this review, we discuss the impact that these practical innovations have had on the study of rickettsiae. Prior to 1986, only eight rickettsioses were clinically recognized; however, in the last 10 years, an additional six have been discovered. We describe the different steps that resulted in the description of each new rickettsiosis and discuss the influence of factors as diverse as physicians' curiosity and the adoption of molecular biology-based identification in helping to recognize these new infections. We also assess the pathogenic potential of rickettsial strains that to date have been associated only with arthropods, and we discuss diseases of unknown etiology that may be rickettsioses.

scholarly journals Active surveillance of acute paediatric hospitalisations demonstrates the impact of vaccination programmes and informs vaccine policy in Canada and Australia

2020 ◽  
Vol 25 (25) ◽  
Author(s):  
Karina A Top ◽  
Kristine Macartney ◽  
Julie A Bettinger ◽  
Ben Tan ◽  
Christopher C Blyth ◽  
...  
Keyword(s):  
Public Health ◽  
Infectious Diseases ◽  
Active Surveillance ◽  
Influenza A ◽  
Monitoring Program ◽  
Emerging Infectious Diseases ◽  
Emerging Infections ◽  
Public Health Response ◽  
Influenza A H1n1 ◽  
The Impact

Sentinel surveillance of acute hospitalisations in response to infectious disease emergencies such as the 2009 influenza A(H1N1)pdm09 pandemic is well described, but recognition of its potential to supplement routine public health surveillance and provide scalability for emergency responses has been limited. We summarise the achievements of two national paediatric hospital surveillance networks relevant to vaccine programmes and emerging infectious diseases in Canada (Canadian Immunization Monitoring Program Active; IMPACT from 1991) and Australia (Paediatric Active Enhanced Disease Surveillance; PAEDS from 2007) and discuss opportunities and challenges in applying their model to other contexts. Both networks were established to enhance capacity to measure vaccine preventable disease burden, vaccine programme impact, and safety, with their scope occasionally being increased with emerging infectious diseases’ surveillance. Their active surveillance has increased data accuracy and utility for syndromic conditions (e.g. encephalitis), pathogen-specific diseases (e.g. pertussis, rotavirus, influenza), and adverse events following immunisation (e.g. febrile seizure), enabled correlation of biological specimens with clinical context and supported responses to emerging infections (e.g. pandemic influenza, parechovirus, COVID-19). The demonstrated long-term value of continuous, rather than incident-related, operation of these networks in strengthening routine surveillance, bridging research gaps, and providing scalable public health response, supports their applicability to other countries.

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