نتایج جستجو برای: acquired immunity

تعداد نتایج: 256049  

Journal: :Mathematical Modelling of Natural Phenomena 2022

We develop a new data-driven immuno-epidemiological model with distributed infectivity, recovery and death rates determined from the epidemiological, clinical experimental data. Immunity in population is taken into account through time-dependent number of vaccinated people different numbers doses acquired immunity for recovered individuals. The validated available show that first time beginning...

2016
Philippe Lefrançois Hugo Chapdelaine Benoît Côté Martin Desrosiers

Chronic rhinosinusitis (CRS) is a frequent chronic condition, which has origins in complex interactions between genetic, immunological and microbial factors. The role of auto-immunity in CRS remains unclear, although recent studies have started to emerge in CRS patient refractory to maximal medical management. We discuss the possible auto-immunity link between CRS and other skin diseases, in pa...

2013
Alex Best Andy Hoyle

A key feature of the vertebrate adaptive immune system is acquired immune memory, whereby hosts launch a faster and heightened response when challenged by previously encountered pathogens, preventing full infection. Here, we use a mathematical model to explore the role of ecological and epidemiological processes in shaping selection for costly acquired immune memory. Applying the framework of a...

Journal: :Journal of the Royal Society, Interface 2013
Alex Best Hannah Tidbury Andy White Mike Boots

While invertebrates lack the machinery necessary for 'acquired immunity', there is increasing empirical evidence that exposure to low levels of disease may 'prime' an invertebrate's immune response, increasing its defence to subsequent exposure. Despite this increasing empirical data, there has been little theoretical attention paid to immune priming. Here, we investigate the evolution of immun...

Journal: :Computer methods and programs in biomedicine 2011
James D. Chapman Michael J. Chappell Neil D. Evans

This paper considers the outcome of a formal sensitivity analysis on a series of epidemic model structures developed to study the population level effects of maternal antibodies. The analysis is used to compare the potential influence of maternally acquired immunity on various age and time domain observations of infection and serology, with and without seasonality. The results of the analysis i...

Journal: :The Southeast Asian journal of tropical medicine and public health 1999
C Pramoolsinsap K Attamasirul N Busagorn Y Maneerat C Nuchprayoon S Tanprasert P Srivatanakul A Theamboonlers P Hirsch Y Poovorawan

Due to improvements in socio-economic and sanitation conditions, Thailand has undergone a change from hyperendemicity to intermediate endemicity for hepatitis A virus infection, leaving a large part of the adult population without immunity. At the same time, the country is still highly endemic for hepatitis B and especially in the northeast, hepatitis C virus infection both of which when acquir...

Journal: :Theoretical population biology 2008
Manojit Roy Robert D Holt

The integration of infectious disease epidemiology with community ecology is an active area of research. Recent studies using SI models without acquired immunity have demonstrated that predation can suppress infectious disease levels. The authors recently showed that incorporating immunity (SIR models) can produce a "hump"-shaped relationship between disease prevalence and predation pressure; t...

2005
Benjamin J. Dodd Christopher Barnhart Constance L. Rogers-Lowery Todd B. Fobian Ronald V. Dimock

Host fish acquire immunity to the parasitic larvae (glochidia) of freshwater mussels (Unionidae). We investigated the persistence of acquired immunity of largemouth bass, Micropterus salmoides (Lacepède, 1802) to glochidia of the broken rays mussel, Lampsilis reeveiana (Call, 1887). Fish received 3 successive priming infections with glochidia to induce an immune response. Primed fish were held ...

Journal: :The American journal of tropical medicine and hygiene 2006
René Bødker Hamisi A Msangeni William Kisinza Steve W Lindsay

The relationship between exposure to Plasmodium falciparum malaria and parasite density and prevalence was studied in six communities along an altitude transect. Prevalence of parasitemia in children decreased by 5% for every 100 meter increase in altitude from 82% in the lowlands at 300 meters to 12% in the highlands at 1,700 meters. This decrease in prevalence corresponded to a 1,000-fold red...

Journal: :Proceedings. Biological sciences 2005
I M Cattadori B Boag O N Bjørnstad S J Cornell P J Hudson

Insight into the dynamics of parasite-host relationships of higher vertebrates requires an understanding of two important features: the nature of transmission and the development of acquired immunity in the host. A dominant hypothesis proposes that acquired immunity develops with the cumulative exposure to infection, and consequently predicts a negative relationship between peak intensity of in...

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