ORCID Profile
0000-0002-7550-0080
Current Organisations
University of Liverpool Management School
,
ESSEC Business School
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Publisher: Institute for Operations Research and the Management Sciences (INFORMS)
Date: 06-2016
Abstract: Although previous studies have documented a positive link between traditional media and brand performance, how social media is related to brand value has not yet been comprehensively explored. We propose a conceptual model to address this research gap, collecting a unique data set that captures information on user and brand actions on three social media platforms (Facebook, Twitter, and YouTube), word-of-mouth, and brand value for 87 brands in 17 industries. We empirically test our model with partial least squares path modeling (PLS-PM). First, we test the direct effects and find that user actions on YouTube and brand actions on Facebook have a positive influence on brand value. Second, we enrich our model by including word-of-mouth as a mediator, finding that the effect of social media goes above and beyond pure word-of-mouth spread. We test for alternative models, by first accounting for s le heterogeneity and second by including brand strength as a control variable, finding that the main model results’ are indeed robust. Our study demonstrates that making use of social media positively relates to brand value, as well as validates a set of objective metrics to measure social media actions, thus advancing knowledge on social media marketing for both academics and practitioners.
Publisher: Asociacion de Facultades de Administracion y Economia - Chile
Date: 07-2020
Abstract: The growing popularity of social media platforms has increased brand investments in social media marketing. However, it is not clear whether and how social media marketing leads to the creation of value for consumers and brands therefore, we investigate how marketer and user-generated content on social media affects consumer and brand metrics. Based on the marketing productivity chain, we propose that customer satisfaction, a leading consumer metric, mediates the link between social media content and brand value. To test such assertions, we use a s le of 87 brands from 17 industries and collect a unique dataset that combines social media data from Facebook, Twitter, and YouTube with customer satisfaction, brand value, and advertising expenses. We find that user-generated content has a stronger effect on customer satisfaction than marketer-generated content. We also find that YouTube is the most effective platform for user generated content. Interestingly, we find that the effects of marketer-generated content depend on the brand’s corporate reputation. In other words, more reputable brands can leverage their marketer-generated content more effectively.
Publisher: Springer Science and Business Media LLC
Date: 21-04-2018
DOI: 10.1007/S00705-018-3843-5
Abstract: In 2018, the family Arenaviridae was expanded by inclusion of 1 new genus and 5 novel species. At the same time, the recently established order Bunyavirales was expanded by 3 species. This article presents the updated taxonomy of the family Arenaviridae and the order Bunyavirales as now accepted by the International Committee on Taxonomy of Viruses (ICTV) and summarizes additional taxonomic proposals that may affect the order in the near future.
Publisher: MDPI AG
Date: 04-11-2021
DOI: 10.3390/V13112226
Abstract: This study aimed to determine the vector competence of bat-associated nycteribiid flies (Eucamsipoda africana) for Marburg virus (MARV) in the Egyptian Rousette Bat (ERB), Rousettus aegyptiacus. In flies fed on subcutaneously infected ERBs and tested from 3 to 43 days post infection (dpi), MARV was detected only in those that took blood during the peak of viremia, 5–7 dpi. Seroconversion did not occur in control bats in contact with MARV-infected bats infested with bat flies up to 43 days post exposure. In flies inoculated intra-coelomically with MARV and tested on days 0–29 post inoculation, only those assayed on day 0 and day 7 after inoculation were positive by q-RT-PCR, but the virus concentration was consistent with that of the inoculum. Bats remained MARV-seronegative up to 38 days after infestation and exposure to inoculated flies. The first filial generation pupae and flies collected at different times during the experiments were all negative by q-RT-PCR. Of 1693 nycteribiid flies collected from a wild ERB colony in Mahune Cave, South Africa where the enzootic transmission of MARV occurs, only one (0.06%) tested positive for the presence of MARV RNA. Our findings seem to demonstrate that bat flies do not play a significant role in the transmission and enzootic maintenance of MARV. However, ERBs eat nycteribiid flies thus, the mechanical transmission of the virus through the exposure of damaged mucous membranes and/or skin to flies engorged with contaminated blood cannot be ruled out.
Publisher: MDPI AG
Date: 10-02-2018
DOI: 10.3390/V10020073
Publisher: MDPI AG
Date: 02-07-2019
DOI: 10.3390/TROPICALMED4030099
Abstract: A high ersity of corona- and paramyxoviruses have been detected in different bat species at study sites worldwide, including Africa, however no biosurveillance studies from Rwanda have been reported. In this study, s les from bats collected from caves in Ruhengeri, Rwanda, were tested for the presence of corona- and paramyxoviral RNA using reverse transcription PCR assays. Positive results were further characterized by DNA sequencing and phylogenetic analysis. In addition to morphological identification of bat species, we also did molecular confirmation of species identities, contributing to the known genetic database available for African bat species. We detected a novel Betacoronavirus in two Geoffroy’s horseshoe bats (Rhinolophus clivosus) bats. We also detected several different paramyxoviral species from various insectivorous bats. One of these viral species was found to be homologous to the genomes of viruses belonging to the Jeilongvirus genus. Additionally, a Henipavirus-related sequence was detected in an Egyptian rousette fruit bat (Rousettus aegyptiacus). These results expand on the known ersity of corona- and paramyxoviruses and their geographical distribution in Africa.
Publisher: SAGE Publications
Date: 2018
DOI: 10.1509/JM.16.0055
Abstract: Although research has examined the social media–shareholder value link, the role of consumer mindset metrics in this relationship remains unexplored. To this end, drawing on the elaboration likelihood model and accessibility/diagnosticity perspective, the authors hypothesize varying effects of owned and earned social media (OSM and ESM) on brand awareness, purchase intent, and customer satisfaction and link these consumer mindset metrics to shareholder value (abnormal returns and idiosyncratic risk). Analyzing daily data for 45 brands in 21 sectors using vector autoregression models, they find that brand fan following improves all three mindset metrics. ESM engagement volume affects brand awareness and purchase intent but not customer satisfaction, while ESM positive and negative valence have the largest effects on customer satisfaction. OSM increases brand awareness and customer satisfaction but not purchase intent, highlighting a nonlinear effect of OSM. Interestingly, OSM is more likely to increase purchase intent for high involvement utilitarian brands and for brands with higher reputation, implying that running a socially responsible business lends more credibility to OSM. Finally, purchase intent and customer satisfaction positively affect shareholder value.
Publisher: Informa UK Limited
Date: 04-04-2018
Publisher: Public Library of Science (PLoS)
Date: 23-06-2022
Publisher: Public Library of Science (PLoS)
Date: 05-10-2023
Publisher: Springer Science and Business Media LLC
Date: 25-06-2018
DOI: 10.1038/S41598-018-27836-W
Abstract: Recently a number of novel adenoviruses have been isolated from erse bat species and from erse geographical locations. We describe the isolation of a novel adenovirus (Family Adenoviridae , genus Mastadenovirus ) from a pool of liver and spleen tissue of an apparently healthy wild-caught Egyptian fruit bat ( Rousettus aegyptiacus ) in South Africa. Genetically the virus is most closely related to four mastadenoviruses recently isolated in China, from Miniopterus schreibersi and Rousettus leschenaultii bats, which are highly ergent from previously identified bat adenoviruses. The length of the Rousettus aegyptiacus adenovirus-3085 (RaegAdV-3085) genome, at 29,342 bp is similar to its closest relatives, and contains 27 open reading frames. The RaegAdV-3085 genome has a low G + C content (36.4%) relative to other viruses in the genus (between 43.6 and 63.9%) but similar to its closest relatives. The inverted terminal repeat (ITR) of RaegAdV-3085 is only 40 bp compared to between 61 and 178 bp of its closest relatives. The discovery of RaegAdV-3085 expands the ersity of known adenoviruses in bats and might represent a member of a new mastadenovirus species in bats.
Publisher: MDPI AG
Date: 03-2019
DOI: 10.3390/V8030065
Publisher: Elsevier BV
Date: 03-2019
Publisher: Springer International Publishing
Date: 2016
Publisher: Proceedings of the National Academy of Sciences
Date: 22-04-2013
Abstract: Although there are over 1,150 bat species worldwide, the ersity of viruses harbored by bats has only recently come into focus as a result of expanded wildlife surveillance. Such surveys are of importance in determining the potential for novel viruses to emerge in humans, and for optimal management of bats and their habitats. To enhance our knowledge of the viral ersity present in bats, we initially surveyed 415 sera from African and Central American bats. Unbiased high-throughput sequencing revealed the presence of a highly erse group of bat-derived viruses related to hepaciviruses and pegiviruses within the family Flaviridae . Subsequent PCR screening of 1,258 bat specimens collected worldwide indicated the presence of these viruses also in North America and Asia. A total of 83 bat-derived viruses were identified, representing an infection rate of nearly 5%. Evolutionary analyses revealed that all known hepaciviruses and pegiviruses, including those previously documented in humans and other primates, fall within the phylogenetic ersity of the bat-derived viruses described here. The prevalence, unprecedented viral bio ersity, phylogenetic ergence, and worldwide distribution of the bat-derived viruses suggest that bats are a major and ancient natural reservoir for both hepaciviruses and pegiviruses and provide insights into the evolutionary history of hepatitis C virus and the human GB viruses.
Publisher: Microbiology Society
Date: 05-2017
DOI: 10.1099/JGV.0.000753
Publisher: American Society for Microbiology
Date: 03-2017
DOI: 10.1128/JVI.01953-16
Abstract: Bats harbor a large ersity of coronaviruses (CoVs), several of which are related to zoonotic pathogens that cause severe disease in humans. Our screening of bat s les collected in Kenya from 2007 to 2010 not only detected RNA from several novel CoVs but, more significantly, identified sequences that were closely related to human CoVs NL63 and 229E, suggesting that these two human viruses originate from bats. We also demonstrated that human CoV NL63 is a recombinant between NL63-like viruses circulating in Triaenops bats and 229E-like viruses circulating in Hipposideros bats, with the breakpoint located near 5′ and 3′ ends of the spike (S) protein gene. In addition, two further interspecies recombination events involving the S gene were identified, suggesting that this region may represent a recombination “hot spot” in CoV genomes. Finally, using a combination of phylogenetic and distance-based approaches, we showed that the genetic ersity of bat CoVs is primarily structured by host species and subsequently by geographic distances. IMPORTANCE Understanding the driving forces of cross-species virus transmission is central to understanding the nature of disease emergence. Previous studies have demonstrated that bats are the ultimate reservoir hosts for a number of coronaviruses (CoVs), including ancestors of severe acute respiratory syndrome coronavirus (SARS-CoV), Middle East respiratory syndrome coronavirus (MERS-CoV), and human CoV 229E (HCoV-229E). However, the evolutionary pathways of bat CoVs remain elusive. We provide evidence for natural recombination between distantly related African bat coronaviruses associated with Triaenops afer and Hipposideros sp. bats that resulted in a NL63-like virus, an ancestor of the human pathogen HCoV-NL63. These results suggest that interspecies recombination may play an important role in CoV evolution and the emergence of novel CoVs with zoonotic potential.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Wanda Markotter.