scholarly journals A model of infection in honeybee colonies with social immunity

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0247294
Author(s):  
Teeraphan Laomettachit ◽  
Monrudee Liangruksa ◽  
Teerasit Termsaithong ◽  
Anuwat Tangthanawatsakul ◽  
Orawan Duangphakdee
Keyword(s):  
Horizontal Transmission ◽  
Critical Factor ◽  
Pathogen Transmission ◽  
Egg Laying ◽  
Disease Spread ◽  
Social Immunity ◽  
First Line ◽  
Colony Losses ◽  
Social Segregation ◽  
The Social

Honeybees (Apis mellifera) play a significant role in the pollination of various food crops and plants. In the past decades, honeybee management has been challenged with increased pathogen and environmental pressure associating with increased beekeeping costs, having a marked economic impact on the beekeeping industry. Pathogens have been identified as a contributing cause of colony losses. Evidence suggested a possible route of pathogen transmission among bees via oral-oral contacts through trophallaxis. Here we propose a model that describes the transmission of an infection within a colony when bee members engage in the trophallactic activity to distribute nectar. In addition, we examine two important features of social immunity, defined as collective disease defenses organized by honeybee society. First, our model considers the social segregation of worker bees. The segregation limits foragers, which are highly exposed to pathogens during foraging outside the nest, from interacting with bees residing in the inner parts of the nest. Second, our model includes a hygienic response, by which healthy nurse bees exterminate infected bees to mitigate horizontal transmission of the infection to other bee members. We propose that the social segregation forms the first line of defense in reducing the uptake of pathogens into the colony. If the first line of defense fails, the hygienic behavior provides a second mechanism in preventing disease spread. Our study identifies the rate of egg-laying as a critical factor in maintaining the colony’s health against an infection. We propose that winter conditions which cease or reduce the egg-laying activity combined with an infection in early spring can compromise the social immunity defenses and potentially cause colony losses.

scholarly journals 3D mapping of disease in ant societies reveals a strategy of a specialized parasite

2014 ◽  
Author(s):  
Raquel G Loreto ◽  
Simon L Elliot ◽  
Mayara LR Freitas ◽  
Thairine M Pereira ◽  
David P Hughes
Keyword(s):  
Disease Spread ◽  
Social Immunity ◽  
Ant Colonies ◽  
Effective Strategies ◽  
Insect Societies ◽  
The Social ◽  
Disease Free ◽  
Ophiocordyceps Unilateralis ◽  
Disease Present

Despite the widely held position that the social insects have evolved effective ways to limit infectious disease spread, many pathogens and parasites do attack insect societies. Maintaining a disease-free nest environment is an important evolutionary feature, but since workers have to leave the nest to forage they are routinely exposed to disease. Here we show that despite effective social immunity, in which workers act collectively to reduce disease inside the nest, 100% of studied ant colonies of Camponotus rufipes in a Brazilian Rainforest were infected by the specialized fungal parasite Ophiocordyceps unilateralis s.l. Not only is disease present for all colonies but long-term dynamics over 20 months revealed disease is a permanent feature. Using 3D maps, we showed the parasite optimizes its transmission by controlling workers’ behavior to die on the doorstep of the colony, where susceptible foragers are predictable in time and space. Therefore, despite social immunity, specialized diseases of ants have evolved effective strategies to exploit insect societies.

Horizontal transmission of a parasite is influenced by infected host phenotype and density

Parasitology ◽  
2014 ◽  
Vol 142 (2) ◽  
pp. 395-405 ◽  
Author(s):  
K. E. ROBERTS ◽  
W. O. H. HUGHES
Keyword(s):  
Control Strategies ◽  
Horizontal Transmission ◽  
Population Level ◽  
Pathogen Transmission ◽  
Parasite Transmission ◽  
Microsporidian Parasite ◽  
Female Workers ◽  
Host Parasite Interactions ◽  
The Social ◽  
Host Parasite

SUMMARYTransmission is a key determinant of parasite fitness, and understanding the dynamics of transmission is fundamental to the ecology and evolution of host–parasite interactions. Successful transmission is often reliant on contact between infected individuals and susceptible hosts. The social insects consist of aggregated groups of genetically similar hosts, making them particularly vulnerable to parasite transmission. Here we investigate how the ratio of infected to susceptible individuals impacts parasite transmission, using the honey bee, Apis mellifera and its microsporidian parasite Nosema ceranae. We used 2 types of infected hosts found simultaneously in colonies; sterile female workers and sexual males. We found a higher ratio of infected to susceptible individuals in groups resulted in a greater proportion of susceptibles becoming infected, but this effect was non-linear and interestingly, the ratio also affected the spore production of infected individuals. The transmission level was much greater in an experiment where the infected individuals were drones than in an experiment where they were workers, suggesting drones may act as intracolonial ‘superspreaders’. Understanding the subtleties of transmission and how it is influenced by the phenotype of the infected/susceptible individuals is important for understanding pathogen transmission at population level, and for optimum targeting of parasite control strategies.

Social Representations and Commitment

2018 ◽  
Vol 23 (3) ◽  
pp. 233-249 ◽  
Author(s):  
Eric Bonetto ◽  
Fabien Girandola ◽  
Grégory Lo Monaco
Keyword(s):  
Social Representations ◽  
Social Representation ◽  
Second Line ◽  
Review Of The Literature ◽  
First Line ◽  
Research Perspectives ◽  
The Social ◽  
Bibliographic Search ◽  
English Articles

Abstract. This contribution consists of a critical review of the literature about the articulation of two traditionally separated theoretical fields: social representations and commitment. Besides consulting various works and communications, a bibliographic search was carried out (between February and December, 2016) on various databases using the keywords “commitment” and “social representation,” in the singular and in the plural, in French and in English. Articles published in English or in French, that explicitly made reference to both terms, were included. The relations between commitment and social representations are approached according to two approaches or complementary lines. The first line follows the role of commitment in the representational dynamics: how can commitment transform the representations? This articulation gathers most of the work on the topic. The second line envisages the social representations as determinants of commitment procedures: how can these representations influence the effects of commitment procedures? This literature review will identify unexploited tracks, as well as research perspectives for both areas of research.

The Social Identity of Hosts and Patrons

2018 ◽  
Author(s):  
Christel Lane
Keyword(s):  
World War Ii ◽  
Organizational Identity ◽  
World War ◽  
Social Segregation ◽  
Social Mixing ◽  
The Social ◽  
Late Twentieth ◽  
Nineteenth And Twentieth Centuries ◽  
Post War ◽  
Late Twentieth Century

This chapter analyses inns, taverns, and public houses in their social context, exploring their organizational identity and the social positions of their owners/tenants. It examines how patrons express their class, gender, and national identity by participation in different kinds of sociality. Seventeenth- and eighteenth-century hostelries afforded more opportunities for cross-class sociability than in later centuries. Social mixing was facilitated because the venues fulfilled multiple economic, social, and political functions, thereby providing room for social interaction apart from communal drinking and eating. Yet, even in these earlier centuries, each type of hostelry already had a distinctive class character, shaping its organizational identity. Division along lines of class hardened, and social segregation increased in the nineteenth and twentieth centuries, up to World War II. In the post-War era, increased democratization of society at large became reflected in easier social mixing in pubs. Despite this democratization, during the late twentieth century the dominant image of pubs as a working-class institution persisted.

scholarly journals Impact of COVID-19 on management of urogynaecology patients: a rapid review of the literature

2021 ◽  
Author(s):  
Jemina Loganathan ◽  
◽  
Stergios K. Doumouchtsis
Keyword(s):  
Evidence Synthesis ◽  
Horizontal Transmission ◽  
Rapid Review ◽  
Review Of The Literature ◽  
First Line ◽  
Face To Face ◽  
Manual Search ◽  
Guidance Documents ◽  
Management Recommendations

Abstract Introduction and hypothesis The coronavirus (COVID-19) pandemic has impacted health systems worldwide. There is a continuing need for clinicians to adapt practice to facilitate timely provision of medical care, whilst minimising horizontal transmission. Guidance and recommendations are increasingly available, and this rapid review aimed to provide a timely evidence synthesis on the current recommendations surrounding urogynaecological care. Methods We performed a literature review using PubMed/Medline, Embase and Cochrane and a manual search of national and international societies for management recommendations for urogynaecological patients during the COVID-19 pandemic. Results Nine guidance documents and 17 articles, including 10 reviews, were included. Virtual clinics are recommended for new and follow-up patients, to assess and initiate treatment, as well as triage patients who require face-to-face appointments. Outpatient investigations such as urodynamics and cystoscopy for benign indications can be deferred. Prolapse and continence surgery should be suspended, except in specific circumstances such as procidentia with upper tract complications and failed pessaries. There is no evidence to support a particular route of surgery, but recommendations are made to minimise COVID-19 transmission. Conclusions Urogynaecological patients face particular challenges owing to inherent vulnerabilities of these populations. Behavioural and medical therapies should be recommended as first line options and initiated via virtual or remote clinics, which are integral to management during the COVID-19 pandemic. Expanding the availability and accessibility of technology will be increasingly required. The majority of outpatient and inpatient procedures can be deferred, but the longer-term effects of such practices are unclear.

scholarly journals A Graft-Based Chemotherapy Method for Screening Effective Molecules and Rescuing Huanglongbing-Affected Citrus Plants

2012 ◽  
Vol 102 (6) ◽  
pp. 567-574 ◽  
Author(s):  
Muqing Zhang ◽  
Charles A. Powell ◽  
Ying Guo ◽  
Melissa S. Doud ◽  
Yongping Duan
Keyword(s):  
Survival Rate ◽  
Transmission Rate ◽  
High Titer ◽  
Critical Factor ◽  
Transmission Efficiency ◽  
Pathogen Transmission ◽  
Citrus Industry ◽  
Chemical Treatments ◽  
Bacterial Titer ◽  
Transmission Studies

Huanglongbing (HLB) is the most devastating disease of citrus. The global citrus industry is in urgent need of effective chemical treatments for HLB control because of its rapid spreading worldwide. Due to the fastidious nature of the pathogens, and the poor permissibility of citrus leaf surfaces, effective screening of chemicals for the HLB control can be challenging. In this study, we developed a graft-based chemotherapy method to rapidly screen potential HLB-controlling chemical compounds. In addition, we improved transmission efficiency by using the best HLB-affected scion–rootstock combination, and demonstrated the HLB bacterial titer was the critical factor in transmission. The HLB-affected lemon scions had a high titer of HLB bacterium, survival rate (83.3%), and pathogen transmission rate (59.9%). Trifoliate, a widely used commercial rootstock, had the highest survival rate (>70.0%) compared with grapefruit (52.6%) and sour orange (50.4%). Using this method, we confirmed a mixture of penicillin and streptomycin was the most effective compounds in eliminating the HLB bacterium from the HLB-affected scions, and in successfully rescuing severely HLB-affected citrus germplasms. These findings are useful not only for chemical treatments but also for graft-based transmission studies in HLB and other Liberibacter diseases.

scholarly journals Seasonal Patterns of Singing Activity Vary With Time of day in The Nightingale (Luscinia Megarhynchos)

The Auk ◽  
2004 ◽  
Vol 121 (1) ◽  
pp. 110-117 ◽  
Author(s):  
Valentin Amrhein ◽  
Hansjoerg P. Kunc ◽  
Marc Naguib
Keyword(s):  
Seasonal Pattern ◽  
Time Of Day ◽  
Egg Laying ◽  
Breeding Cycle ◽  
Seasonal Patterns ◽  
Singing Behavior ◽  
The Social ◽  
Luscinia Megarhynchos ◽  
Singing Activity ◽  
Late Stages

Abstract Seasonal patterns of singing activity of male birds have been thoroughly studied, but little is known about how those patterns vary with time of day. Here, we censused mated and unmated male Nightingales (Luscinia megarhynchos) at four different hours of the day throughout the breeding cycle. In unmated males, singing activity increased until the young hatched in their neighborhood, and the seasonal variation was similar at each of the four hours of the day. In mated males, however, the seasonal patterns of singing activity differed between hours of the day. In morning (about the hour of egg-laying) and during the dusk chorus, the singing activity of mated males was strongly influenced by the females' reproductive state: singing activity was low before egg-laying and during incubation, but high during the egg-laying period. In the dawn chorus, however, singing activity showed a similar seasonal pattern in mated and unmated males and was high until late stages of the breeding cycle. Our results suggest that the social context influences singing behavior to a varying degree across the season, and that this variation also depends on time of day. The hour of data collection thus is an important but often neglected factor when seasonal changes of singing activity are studied.

scholarly journals The Pathogen Profile of a Honey Bee Queen Does Not Reflect That of Her Workers

Insects ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 382 ◽  
Author(s):  
Jessica L. Kevill ◽  
Katie Lee ◽  
Michael Goblirsch ◽  
Erin McDermott ◽  
David R. Tarpy ◽  
...  
Keyword(s):  
Honey Bee ◽  
Horizontal Transmission ◽  
Pathogen Transmission ◽  
Black Queen Cell Virus ◽  
Deformed Wing Virus ◽  
Israeli Acute Paralysis Virus ◽  
Queen Cell ◽  
Honey Bee Queen ◽  
Acute Bee Paralysis Virus ◽  
Paralysis Virus

Throughout a honey bee queen’s lifetime, she is tended to by her worker daughters, who feed and groom her. Such interactions provide possible horizontal transmission routes for pathogens from the workers to the queen, and as such a queen’s pathogen profile may be representative of the workers within a colony. To explore this further, we investigated known honey bee pathogen co-occurrence, as well as pathogen transmission from workers to queens. Queens from 42 colonies were removed from their source hives and exchanged into a second, unrelated foster colony. Worker samples were taken from the source colony on the day of queen exchange and the queens were collected 24 days after introduction. All samples were screened for Nosema spp., Trypanosome spp., acute bee paralysis virus (ABPV), black queen cell virus (BQCV), chronic bee paralysis virus (CBPV), Israeli acute paralysis virus (IAPV), Lake Sinai virus (LSV), and deformed wing virus master variants (DWV-A, B, and C) using RT-qPCR. The data show that LSV, Nosema, and DWV-B were the most abundant pathogens in colonies. All workers (n = 42) were LSV-positive, 88% were Nosema-positive, whilst pathogen loads were low (<1 × 106 genome equivalents per pooled worker sample). All queens (n = 39) were negative for both LSV and Nosema. We found no evidence of DWV transmission occurring from worker to queen when comparing queens to foster colonies, despite DWV being present in both queens and workers. Honey bee pathogen presence and diversity in queens cannot be revealed from screening workers, nor were pathogens successfully transmitted to the queen.

scholarly journals The social brain: allowing humans to boldly go where no other species has been

2010 ◽  
Vol 365 (1537) ◽  
pp. 165-176 ◽  
Author(s):  
Uta Frith ◽  
Chris Frith
Keyword(s):  
Social Cognition ◽  
Social Interaction ◽  
Comparative Studies ◽  
Computational Models ◽  
Developmental Psychology ◽  
Critical Factor ◽  
Social Signals ◽  
Social Brain ◽  
The Social ◽  
Closing The Loop

The biological basis of complex human social interaction and communication has been illuminated through a coming together of various methods and disciplines. Among these are comparative studies of other species, studies of disorders of social cognition and developmental psychology. The use of neuroimaging and computational models has given weight to speculations about the evolution of social behaviour and culture in human societies. We highlight some networks of the social brain relevant to two-person interactions and consider the social signals between interacting partners that activate these networks. We make a case for distinguishing between signals that automatically trigger interaction and cooperation and ostensive signals that are used deliberately. We suggest that this ostensive signalling is needed for ‘closing the loop’ in two-person interactions, where the partners each know that they have the intention to communicate. The use of deliberate social signals can serve to increase reputation and trust and facilitates teaching. This is likely to be a critical factor in the steep cultural ascent of mankind.

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