scholarly journals Perspectives on the basic reproductive ratio

2005 ◽  
Vol 2 (4) ◽  
pp. 281-293 ◽  
Author(s):  
J.M Heffernan ◽  
R.J Smith ◽  
L.M Wahl
Keyword(s):  
Influenza A ◽  
Epidemiological Data ◽  
Emerging Diseases ◽  
Infectious Period ◽  
Single Individual ◽  
Basic Reproductive Ratio ◽  
Vector Borne Diseases ◽  
True Value ◽  
Secondary Infections ◽  
Vector Borne

The basic reproductive ratio, R 0 , is defined as the expected number of secondary infections arising from a single individual during his or her entire infectious period, in a population of susceptibles. This concept is fundamental to the study of epidemiology and within-host pathogen dynamics. Most importantly, R 0 often serves as a threshold parameter that predicts whether an infection will spread. Related parameters which share this threshold behaviour, however, may or may not give the true value of R 0 . In this paper we give a brief overview of common methods of formulating R 0 and surrogate threshold parameters from deterministic, non-structured models. We also review common means of estimating R 0 from epidemiological data. Finally, we survey the recent use of R 0 in assessing emerging diseases, such as severe acute respiratory syndrome and avian influenza, a number of recent livestock diseases, and vector-borne diseases malaria, dengue and West Nile virus.

scholarly journals POTENSI TRIATOMA SP DALAM PENYEBARAN PENYAKIT TULAR VEKTOR EMERGING DI INDONESIA

2019 ◽  
Vol 11 (2) ◽  
pp. 131-138
Author(s):  
Risqa Novita
Keyword(s):  
Allergic Reaction ◽  
Southeast Asia ◽  
Chagas Disease ◽  
Early Warning System ◽  
Warning System ◽  
Emerging Diseases ◽  
Laboratory Research ◽  
Tropical Country ◽  
Vector Borne Diseases ◽  
Vector Borne

The era of globalization allows migration fastly, so we do not have boundary of a country. This led to an increase of the infectious diseases. Indonesia also have an impact on this globalization by highly migration. Indonesia is a tropical country and has diversity of vectors that can transmit various tropical diseases. One of a vector  which transmitted vector borne diseases is a bug Triatoma. Triatoma lives near the people’s house and in the bed. One of the species of Triatoma which found in indonesia is Triatoma rubrifasciata which is vector of Chagas disease and Leprosy and can cause allergic reaction of the skin after the bite. Triatoma infection in Southeast Asia, including in Indonesia has not been widely reported. This condition should make us to be alert on the disease emerging or re emerging diseases that can be caused by Triatoma . This article aims to study Triatoma as a vector of emerging and potentially re emerging diseases in Indonesia, which are Chagas, skin allergic reaction after bite and Leprosy. Methods. Literature review by look in google scholar and pubmed, by search using keywords: emerging parasitic, vector borne diseases, Triatoma in Southeast Asia. Inclusion criterias are research articles, laboratory research, case report, and systematic surveillance. Based on the literatures, tracing data that Indonesia has a chance to be  the cases of Chagas disease, Skin allergic reaction of Triatoma and Leprosy. It is supposed to made the vigilance on  make a early warning system, so our public health coud be achieved highest.

scholarly journals Emerging and Re-emerging Vector-Borne Infectious Diseases and the Challenges for Control: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Bayissa Chala ◽  
Feyissa Hamde
Keyword(s):  
Infectious Diseases ◽  
Public Health Problem ◽  
Hemorrhagic Fever ◽  
Emerging Diseases ◽  
West Nile Fever ◽  
Valley Fever ◽  
Vector Borne Diseases ◽  
Vector Borne ◽  
The Many ◽  
Epidemiological Profile

Vector-borne emerging and re-emerging diseases pose considerable public health problem worldwide. Some of these diseases are emerging and/or re-emerging at increasing rates and appeared in new regions in the past two decades. Studies emphasized that the interactions among pathogens, hosts, and the environment play a key role for the emergence or re-emergence of these diseases. Furthermore, social and demographic factors such as human population growth, urbanization, globalization, trade exchange and travel and close interactions with livestock have significantly been linked with the emergence and/or re-emergence of vector-borne diseases. Other studies emphasize the ongoing evolution of pathogens, proliferation of reservoir populations, and antimicrobial drug use to be the principal exacerbating forces for emergence and re-emergence of vector-borne infectious diseases. Still other studies equivocally claim that climate change has been associated with appearance and resurgence of vector-borne infectious diseases. Despite the fact that many important emerging and re-emerging vector-borne infectious diseases are becoming better controlled, our success in stopping the many new appearing and resurging vector-borne infectious diseases that may happen in the future seems to be uncertain. Hence, this paper reviews and synthesizes the existing literature to explore global patterns of emerging and re-emerging vector-borne infections and the challenges for their control. It also attempts to give insights to the epidemiological profile of major vector-borne diseases including Zika fever, dengue, West Nile fever, Crimean-Congo hemorrhagic fever, Chikungunya, Yellow fever, and Rift Valley fever.

scholarly journals Relationship between Flooding and Out Break of Infectious Diseasesin Kenya: A Review of the Literature

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Fredrick Okoth Okaka ◽  
Beneah D. O. Odhiambo
Keyword(s):  
Infectious Diseases ◽  
Disease Outbreaks ◽  
Epidemiological Data ◽  
Early Warning Systems ◽  
Mitigation Strategies ◽  
Extensive Literature ◽  
Vector Borne Diseases ◽  
Infectious Disease Outbreaks ◽  
Vector Borne ◽  
The Relationship

Flooding can potentially increase the spread of infectious diseases. To enhance good understanding of the health consequences of flooding and facilitate planning for mitigation strategies, deeper consideration of the relationship between flooding and out-break of infectious diseases is required. This paper examines the relationship between occurrence of floods in Kenya and outbreak of infectious diseases and possible interventions. This review intended to build up the quality and comprehensiveness of evidence on infectious diseases arising after flooding incidence in Kenya. An extensive literature review was conducted in 2017, and published literature from 2000 to 2017 was retrieved. This review suggests that infectious disease outbreaks such as waterborne, rodent-borne, and vector-borne diseases have been associated with flooding in Kenya. But there is need for more good quality epidemiological data to cement the evidence. Comprehensive surveillance and risk assessment, early warning systems, emergency planning, and well-coordinated collaborations are essential in reducing future vulnerability to infectious diseases following flooding.

scholarly journals Focus on Common Small Animal Vector-Borne Diseases in Central and Southeastern Europe

2020 ◽  
Vol 70 (2) ◽  
pp. 147-169
Author(s):  
Leschnik Michael
Keyword(s):  
Small Animal ◽  
Diagnostic Procedures ◽  
Emerging Diseases ◽  
Pathogen Transmission ◽  
Temporal And Spatial Distribution ◽  
Local Climate ◽  
Vector Borne Diseases ◽  
Prophylactic Measures ◽  
Zoonotic Risk ◽  
Vector Borne

AbstractVector-borne diseases are one of the main causes of morbidity and mortality in small animals in Europe. Many of these diseases are well-known among veterinary practitioners and some of them are called emerging diseases as prevalence, temporal and spatial distribution seem to increase in Europe. The number of newly recognized pathogens, transmitted by a variety of arthropod vectors, that are relevant for dogs and cats, is also increasing every year. The prevalence among infected vectors and hosts is a hot topic in veterinary science throughout the entire continent, as well as the development of efficient diagnostic procedures, therapy and prophylactic measures. Companion animal vector-borne diseases comprise a large group of pathogens including viruses, bacteria, protozoa and helminths. These pathogens are mainly transmitted by bloodsucking arthropods (ticks, fleas, mosquitos, sand flies), and more seldom by direct transmission between vertebrate hosts. Vector prevalence and activity is influenced by local climate conditions, host species density, changes in landscape and land use. Human parameters such as poverty and migration affect the use of prophylactic measures against pathogen transmission and infection as well as increasing the zoonotic risk to introducing pathogens by infected humans. Small animal associated factors such as pet trade and pet travel spread infection and certain vectors such as ticks and fleas. All these factors pose several complex and significant challenges for veterinarians in clinical practice to decide on efficient laboratory work-up and constructive diagnostic procedures.

scholarly journals Screening of Influenza a (H1N1) Neuraminidase Inhibitor for Kabasura Kudineer, Nilavembu Kudineer and the Novel Formulation JACOM

2021 ◽  
Author(s):  
SHREE DEVI MS ◽  
SATHIYARAJESWARAN P ◽  
Mohanasrinivasan V ◽  
SUBATHRADEVI C ◽  
Ramaswamy RS ◽  
...  
Keyword(s):  
Influenza A ◽  
Tamil Nadu ◽  
Neuraminidase Inhibitor ◽  
Evidence Base ◽  
The Novel ◽  
Vector Borne Diseases ◽  
Neuraminidase Inhibition ◽  
Influenza A H1n1 ◽  
Vector Borne ◽  
Change Vector

<p>Due to erratic climate change, vector-borne diseases started flaring up from the second half of the last decade. Siddha medicine has been used as a public health tool to effectively manage chikungunya and dengue in the epidemics that happened in 2008 and 2016. Tamil Nadu government has made enormous efforts to control vector-borne diseases. Due to which morbidity and mortality due to vector borne diseases came down compared with other states. Two official Siddha formulations, namely Kabasura Kudineer Chooranam and Nilavembu Kudineer Chooranam and novel herbal formulation – JACOM, are used to combat vector-borne diseases. These decoctions lack an evidence base as a formulation. Screening has been done to check the efficacy of the formulation in inhibiting neuraminidase. Neuraminidase inhibition assay was performed to determine the activity of Siddha formulations. The Kabasura Kudineer Chooranam, Nilavembu Kudineer Chooranam and JACOM showed excellent inhibitory activity. The Kabasura Kudineer and Nilavembu Kudineer and JACOM aqueous extract showed maximum neuraminidase inhibition of 80.35%, 91.78% and 87.97%, respectively.</p>

Exploiting symbiotic interactions for vector/disease control

2018 ◽  
Author(s):  
Patrick Mavingui ◽  
Claire Valiente Mor ◽  
Pablo Tortosa
Keyword(s):  
Disease Transmission ◽  
Biotic Interactions ◽  
Emerging Diseases ◽  
Pathogen Transmission ◽  
Strong Impact ◽  
Behavioral Alterations ◽  
Vector Borne Diseases ◽  
Complex Interactions ◽  
Symbiotic Interactions ◽  
Vector Borne

Arthropods transmit a variety of diseases to humans and animals, including arboviruses, bacteria and parasites. No efficient treatments or control methods are available for many vector-borne diseases, especially for emerging diseases. Therefore, the development of alternative strategies aiming at controlling disease transmission is encouraged worldwide. Although transmission phenomenon is a result of complex interactions involving several actors evolving in a changing environment, the biotic relationship between pathogens and their vectors represents a key step in successful disease transmission. Recent studies highlighted a strong impact of microbiomes on the life-history traits of arthropod hosts. This chapter emphasizes those biotic interactions having an impact on adaptive traits influencing disease transmission. Evidence in behavioral alterations of vector populations/individuals with relevance to vector-pathogen transmission mitigation is reviewed. Opportunities to take advantage of such biotic processes in the control of vector-borne diseases in different epidemiological, entomological and environmental settings are explored.

Dirofilariasis – an emergent human parasitosis in Romania

2015 ◽  
Vol 60 (3) ◽  
Author(s):  
Manuela Arbune ◽  
Michaela Dobre
Keyword(s):  
Public Health ◽  
Climate Change ◽  
Epidemiological Data ◽  
Human Medicine ◽  
Body Perception ◽  
Case Presentation ◽  
Pediatric Department ◽  
Local Pain ◽  
Vector Borne Diseases ◽  
Vector Borne

AbstractChanging vector habitats due to climate change increase the risk of less common vector-borne diseases spreading to temperate areas. An example of such a disease is dirofilariasis. The present article is a case presentation of ocular dirofilariasis. The peculiarities of this case and its implications to public health are presented herein, in addition to a literature review of the epidemiological data regarding dirofilariasis in dogs and humans. A16-year-old adolescent, who had never travelled outside Galaţi County, was admitted to the hospital’s pediatric department with conjunctival edema, foreign body perception, redness and local pain in the left eye. A parasitological exam identified Dirofilaria repens. The outcome of the condition was favorable. Although canine dirofilariasis is more often encountered by veterinary practices, only few human cases had hither to been reported in Romania, none in Galaţi County. A national Romanian prevalence study on dirofilariasis in animals is called for in order to improve the management of the disease, both in veterinary and human medicine.

scholarly journals Vector-Borne Diseases and Climate Change in the Environmental Context in Haiti

2021 ◽  
Author(s):  
Ketty Balthazard-Accou ◽  
Max François Millien ◽  
Daphnée Michel ◽  
Gaston Jean ◽  
David Telcy ◽  
...  
Keyword(s):  
Climate Change ◽  
Negative Impact ◽  
Emerging Diseases ◽  
Global Changes ◽  
Pronounced Increase ◽  
Vector Borne Diseases ◽  
Climate And Environmental Change ◽  
Vector Borne ◽  
The Republic ◽  
The Relationship

Climate change is one of the main challenges facing many countries, particularly developing countries, because of its negative impact on their various ecosystems and their socio-economic development, which very often leads them down a slow descent into poverty. This is because climate change can manifest itself in different forms such as climate variability and extreme events (droughts, epidemics, floods, storms and hurricanes), which can affect biodiversity and cause many human and animal diseases and deaths. In fact, the evolution of ecosystems is dependent on climate and environmental change and appears to be closely associated with many emerging or re-emerging diseases. In general, the ecosystems considered to be most exposed to climate change are those located in and around the intertropical convergence zone in particular. They are believed to be closely linked to the occurrence of several emerging diseases, particularly vector-borne diseases. For years, the Republic of Haiti has been experiencing the adverse effects of these global changes with a marked disruption of its rainfall pattern and prolonged periods of drought as well as a pronounced increase in temperatures even in high altitude areas. Although there is evidence that climate change is increasing the frequency of vector-borne diseases and may contribute to increasing the virulence of their pathogens, there are very few studies conducted in Haiti on the relationship between climate change and vector-borne diseases. The purpose of this chapter is to define the interrelationships between climate change and vector-borne diseases in Haiti by identifying avenues of research to better understand the effects of climate change on public health and to make appropriate recommendations to decision-makers to ensure proper management.

scholarly journals Epidemic to Pandemic: Just a Matter of Time

2020 ◽  
Vol 34 (4) ◽  
pp. 1-3
Author(s):  
Ayesha Humayun ◽  
Muhammad Imran Anwar ◽  
Saadia Shahzad Alam ◽  
Usman Iqbal
Keyword(s):  
Infectious Diseases ◽  
Influenza A ◽  
Emerging Infectious Diseases ◽  
Ecological Factors ◽  
Emerging Diseases ◽  
Global Public Health ◽  
Emerging Infections ◽  
Corona Virus ◽  
Substantial Risk ◽  
Vector Borne

Epidemic and pandemic potential of all respiratory diseases of zoonotic origin is well known. In recent history global public health threat was inflicted by zoonotic origin infectious diseases with pandemic potential including, Ebola and Marburg haemorrhagic fevers, severe acute respiratory syndrome (SARS), influenza A (H5N1), Middle East respiratory syndrome corona virus (MERSCoV), 1 and the recently discovered COVID-19. Change of epidemic to a pandemic is just a matter of time. A novel Corona virus 2019 (COVID-19) is appearing to be one of the rapidly transmitting diseases because of the social and economic linkages worldwide. Emerging infectious diseases (EIDs) are not new but their incidence or geographical involvement is rapidly increasing. Global temporal and spatial patterns of these emerging infections are studied well in literature concluding significant correlation of EIDs with socio-economic, environmental and ecological factors. It helps to identify regions as ‘hotspots’ for EIDs with a substantial risk of vector-borne and wildlife zoonotic emerging diseases.

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