#EV-71 #seroepidemiology in #Taiwan in 2017 and comparison of those rates in 1997, 1999 and 2007 (PLoS One, abstract)

[Source: PLoS One, full page: (LINK). Abstract, edited.]

OPEN ACCESS /  PEER-REVIEWED / RESEARCH ARTICLE

Enterovirus 71 seroepidemiology in Taiwan in 2017 and comparison of those rates in 1997, 1999 and 2007

Jian-Te Lee, Ting-Yu Yen, Wei-Liang Shih, Chun-Yi Lu, Ding-Ping Liu, Yi-Chuan Huang, Luan-Yin Chang , Li-Min Huang, Tzou-Yien Lin

Published: October 17, 2019 / DOI: https://doi.org/10.1371/journal.pone.0224110

 

Abstract

Background

During recent 20 years, enterovirus 71 (EV71) has emerged as a major concern among children, particularly in the Asia-Pacific region. To understand current EV71 serostatus, to find risk factors associated with EV71 infection and to establish future EV71 vaccine policy, we performed a seroepidemiology study in Taiwan in 2017.

Methods

After informed consent was obtained, we enrolled preschool children, 6–15-year-old students, 16–50-year-old people. They received a questionnaire and a blood sample was collected to measure the EV71 neutralization antibody.

Results

Altogether, 920 subjects were enrolled with a male-to-female ratio of 1.03. The EV71 seropositive rate was 10% (8/82) in infants, 4% (6/153) in 1-year-old children, 8% (7/83) in 2-year-old children, 8% (13/156) in 3–5-year-old children, 31% (38/122) in 6–11-year-old primary school students, 45% (54/121) in 12–15-year-old high school students and 75% (152/203) in 16-50-year-old people. Risk factors associated with EV71 seropositivity in preschool children were female gender, having siblings, more siblings, and contact with herpangina or hand-foot-and-mouth disease. The risk factor with EV71 seropositivity in 16–50-year-old people was having children in their families in addition to older age (p<0.001). Compared with the rates in 1997, 1999 and 2007, the rates in children were significantly lower in 2017.

Conclusion

EV71 seropositive rates were very low, at 4% to 10%, in preschool children and not high, at 31%, in primary school students. Preschool children are highly susceptible and need EV71 vaccine most.

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Citation: Lee J-T, Yen T-Y, Shih W-L, Lu C-Y, Liu D-P, Huang Y-C, et al. (2019) Enterovirus 71 seroepidemiology in Taiwan in 2017 and comparison of those rates in 1997, 1999 and 2007. PLoS ONE 14(10): e0224110. https://doi.org/10.1371/journal.pone.0224110

Editor: Dong-Yan Jin, University of Hong Kong, HONG KONG

Received: August 13, 2019; Accepted: October 4, 2019; Published: October 17, 2019

Copyright: © 2019 Lee et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Data Availability: All relevant data are within the paper and its Supporting Information files.

Funding: This study was supported by grants from the Taiwan Centers for Disease Control, the Ministry of Health and Welfare, Taiwan (grant number MOHW 106-CDC-C-114-000117 to L-YC) and the Ministry of Science and Technology, Taiwan (grant numbers MOST 105-2320-B-002-016 and 105-2314-B-002-139-MY3) to L-YC. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing interests: The authors have declared that no competing interests exist.

Keywords: Enterovirus; EV-71; Taiwan; Serology; Seroprevalence.

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#Serosurvey for #Influenza D Virus Exposure in #Cattle, #USA, 2014–2015 (Emerg Infect Dis., abstract)

[Source: US Centers for Disease Control and Prevention (CDC), Emerging Diseases Journal, full page: (LINK). Abstract, edited.]

Volume 25, Number 11—November 2019 / Research

Serosurvey for Influenza D Virus Exposure in Cattle, United States, 2014–2015

Simone Silveira, Shollie M. Falkenberg  , Bryan S. Kaplan, Beate Crossley, Julia F. Ridpath, Fernando B. Bauermann, Charles P. Fossler, David A. Dargatz, Rohana P. Dassanayake, Amy L. Vincent, Cláudio W. Canal, and John D. Neill

Author affiliations: Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil (S. Silveira, C.W. Canal); US Department of Agriculture, Ames, Iowa, USA (S.M. Falkenberg, B.S. Kaplan, J.F. Ridpath, R.P. Dassanayake, A.L. Vincent, J.D. Neill); University of California, Davis, California, USA (B. Crossley); Oklahoma State University, Stillwater, Oklahoma, USA (F.B. Bauermann); US Department of Agriculture, Fort Collins, Colorado, USA (C.P. Fossler, D.A. Dargatz)

 

Abstract

Influenza D virus has been detected predominantly in cattle from several countries. In the United States, regional and state seropositive rates for influenza D have previously been reported, but little information exists to evaluate national seroprevalence. We performed a serosurveillance study with 1,992 bovine serum samples collected across the country in 2014 and 2015. We found a high overall seropositive rate of 77.5% nationally; regional rates varied from 47.7%–84.6%. Samples from the Upper Midwest and Mountain West regions showed the highest seropositive rates. In addition, seropositive samples were found in 41 of the 42 states from which cattle originated, demonstrating that influenza D virus circulated widely in cattle during this period. The distribution of influenza D virus in cattle from the United States highlights the need for greater understanding about pathogenesis, epidemiology, and the implications for animal health.

Keywords: Influenza D; Cattle; Seroprevalence; USA.

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Infection of Western Gray #Kangaroos (Macropus fuliginosus) with #Australian #Arboviruses Associated with #Human #Infection (Vector Borne Zoo Dis., abstract)

[Source: Vector Borne and Zoonotic Diseases, full page: (LINK). Abstract, edited.]

Infection of Western Gray Kangaroos (Macropus fuliginosus) with Australian Arboviruses Associated with Human Infection

Narayan Gyawali, Andrew W. Taylor-Robinson, Richard S. Bradbury, Abbey Potter, and John G. Aaskov

Published Online: 26 Sep 2019

 

Abstract

More than 75 arboviruses (arthropod-borne viruses) have been identified in Australia. While Alfuy virus (ALFV), Barmah Forest virus (BFV), Edge Hill virus (EHV), Kokobera virus (KOKV), Murray Valley encephalitis virus (MVEV), Sindbis virus (SINV), Ross River virus (RRV), Stratford virus (STRV), and West Nile virus strain Kunjin (KUNV) have been associated with human infection, there remains a paucity of data regarding their respective transmission cycles and any potential nonhuman vertebrate hosts. It is likely that these viruses are maintained in zoonotic cycles involving native animals rather than solely by human-to-human transmission. A serosurvey (n = 100) was undertaken to determine the prevalence of neutralizing antibodies against a panel of Australian arboviruses in western gray kangaroos (Macropus fuliginosus) obtained from 11 locations in the midwest to southwest of Western Australia. Neutralizing antibodies against RRV were detected in 25%, against BFV in 14%, and antibodies to both viruses in 34% of serum samples. The prevalence of antibodies against these two viruses was the same in males and females, but higher in adult than in subadult kangaroos (p < 0.05). Twenty-one percent of samples had neutralizing antibodies against any one or more of the flaviviruses ALFV, EHV, KOKV, MVEV, and STRV. No neutralizing antibodies against SINV and KUNV were detected. If this sample of kangaroo sera was representative of the broader Australian population of macropods, it suggests that they are common hosts for RRV and BFV. The absence or low seroprevalence of antibodies against the remaining arboviruses suggests that they are not prevalent in the region or that kangaroos are not commonly infected with them. The detection of neutralizing antibodies to MVEV requires further investigation as this virus has not been identified previously so far south in Western Australia.

Keywords: Arbovirus; Flavivirus; Kangaroos; Wildlife; Human; Australia.

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#Density-dependence and #persistence of #Morogoro #arenavirus #transmission in a fluctuating population of its reservoir host (J Anim Ecol., abstract)

[Source: US National Library of Medicine, full page: (LINK). Abstract, edited.]

J Anim Ecol. 2019 Sep 23. doi: 10.1111/1365-2656.13107. [Epub ahead of print]

Density-dependence and persistence of Morogoro arenavirus transmission in a fluctuating population of its reservoir host.

Mariën J1, Borremans B1,2,3, Verhaeren C1, Kirkpatrick L1, Gryseels S1,4,5, Goüy de Bellocq J6, Günther S7, Sabuni CA8, Massawe AW8, Reijniers J1,9, Leirs H1.

Author information: 1 Evolutionary Ecology Group, University of Antwerp, Antwerp, Belgium. 2 Department of Ecology and Evolutionary Biology, University of California, Los Angeles, USA. 3 Interuniversity Institute for Biostatistics and statistical Bioinformatics (I-BIOSTAT), Hasselt University, Hasselt, Belgium. 4 Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, USA. 5 Clinical and Epidemiological Virology, Rega Institute, KU Leuven, Leuven, Belgium. 6 Institute of Vertebrate Biology, Research Facility Studenec, The Czech Academy of Sciences, Brno, Czech Republic. 7 Bernhard-Nocht-Institute for Tropical Medicine, Hamburg, Germany. 8 PestManagement Centre, Sokoine University of Agriculture, Morogoro, Tanzania. 9 Department of Engineering Management, University of Antwerp, Antwerp, Belgium.

 

Abstract

1.A key aim in wildlife disease ecology is to understand how host and parasite characteristics influence parasite transmission and persistence. Variation in host population density can have strong impacts on transmission and outbreaks, and theory predicts particular transmission-density patterns depending on how parasites are transmitted between individuals. Here, we present the results of a study on the dynamics of Morogoro arenavirus in a population of multimammate mice (Mastomys natalensis). This widespread African rodent, which is also the reservoir host of Lassa arenavirus in West Africa, is known for its strong seasonal density fluctuations driven by food availability.

2.We investigated to what degree virus transmission changes with host population density and how the virus might be able to persist during periods of low host density.

3.A seven-year capture-mark-recapture study was conducted in Tanzania where rodents were trapped monthly and screened for the presence of antibodies against Morogoro virus. Observed seasonal seroprevalence patterns were compared with those generated by mathematical transmission models to test different hypotheses regarding the degree of density-dependence and the role of chronically infected individuals.

4.We observed that Morogoro virus seroprevalence correlates positively with host density with a lag of one to four months. Model results suggest that the observed seasonal seroprevalence dynamics can be best explained by a combination of vertical and horizontal transmission, and that a small number of animals needs to be infected chronically to ensure viral persistence.

5.Transmission dynamics and viral persistence were best explained by the existence of both acutely and chronically infected individuals, and by seasonally changing transmission rates. Due to the presence of chronically infected rodents, rodent control is unlikely to be a feasible approach for eliminating arenaviruses such as Lassa virus from Mastomys populations.

© 2019 The Authors. Journal of Animal Ecology © 2019 British Ecological Society.

PMID: 31545505 DOI: 10.1111/1365-2656.13107

Keywords: Arenavirus; Wildlife; Rodents; Morogoro virus; Seroprevalence; Tanzania.

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#Dengue and #chikungunya among outpatients with acute undifferentiated #fever in #Kinshasa, #DRC: A cross-sectional study (PLoS Negl Trop Dis., abstract)

[Source: PLoS Neglected Tropical Diseases, full page: (LINK). Abstract, edited.]

OPEN ACCESS /  PEER-REVIEWED / RESEARCH ARTICLE

Dengue and chikungunya among outpatients with acute undifferentiated fever in Kinshasa, Democratic Republic of Congo: A cross-sectional study

Sam Proesmans , Freddy Katshongo, John Milambu, Blaise Fungula, Hypolite Muhindo Mavoko, Steve Ahuka-Mundeke, Raquel Inocêncio da Luz, Marjan Van Esbroeck, Kevin K. Ariën, Lieselotte Cnops, Birgit De Smet, Pascal Lutumba, Jean-Pierre Van geertruyden, Veerle Vanlerberghe

Published: September 5, 2019 / DOI: https://doi.org/10.1371/journal.pntd.0007047 / This is an uncorrected proof.

 

Abstract

Background

Pathogens causing acute fever, with the exception of malaria, remain largely unidentified in sub-Saharan Africa, given the local unavailability of diagnostic tests and the broad differential diagnosis.

Methodology

We conducted a cross-sectional study including outpatient acute undifferentiated fever in both children and adults, between November 2015 and June 2016 in Kinshasa, Democratic Republic of Congo. Serological and molecular diagnostic tests for selected arboviral infections were performed on blood, including PCR, NS1-RDT, ELISA and IFA for acute, and ELISA and IFA for past infections.

Results

Investigation among 342 patients, aged 2 to 68 years (mean age of 21 years), with acute undifferentiated fever (having no clear focus of infection) revealed 19 (8.1%) acute dengue–caused by DENV-1 and/or DENV-2 –and 2 (0.9%) acute chikungunya infections. Furthermore, 30.2% and 26.4% of participants had been infected in the past with dengue and chikungunya, respectively. We found no evidence of acute Zika nor yellow fever virus infections. 45.3% of patients tested positive on malaria Rapid Diagnostic Test, 87.7% received antimalarial treatment and 64.3% received antibacterial treatment.

Discussion

Chikungunya outbreaks have been reported in the study area in the past, so the high seroprevalence is not surprising. However, scarce evidence exists on dengue transmission in Kinshasa and based on our data, circulation is more important than previously reported. Furthermore, our study shows that the prescription of antibiotics, both antibacterial and antimalarial drugs, is rampant. Studies like this one, elucidating the causes of acute fever, may lead to a more considerate and rigorous use of antibiotics. This will not only stem the ever-increasing problem of antimicrobial resistance, but will–ultimately and hopefully–improve the clinical care of outpatients in low-resource settings.

Trial registration ClinicalTrials.gov NCT02656862.

 

Author summary

Malaria remains one of the most important causes of fever in sub-Saharan Africa. However, its share is declining, since the diagnosis and treatment of malaria have improved significantly over the years. Hence leading to an increase in the number of patients presenting with non-malarial fever. Often, obvious clinical signs and symptoms like cough or diarrhea are absent, probing the question: “What causes the fever?” Previous studies have shown that the burden of arboviral infections–like dengue and chikungunya–in sub-Saharan Africa is underestimated, which is why we screened for four common arboviral infections in patients presenting with ‘undifferentiated fever’ at an outpatient clinic in suburban Kinshasa, Democratic Republic of Congo. Among the patients tested, we found that one in ten presented with an acute arboviral infection and that almost one in three patients had been infected in the past. These findings suggest that clinicians should think about arboviral infections more often, thereby refraining from the prescription of antibiotics, a practice increasingly problematic given the global rise of antimicrobial resistance.

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Citation: Proesmans S, Katshongo F, Milambu J, Fungula B, Muhindo Mavoko H, Ahuka-Mundeke S, et al. (2019) Dengue and chikungunya among outpatients with acute undifferentiated fever in Kinshasa, Democratic Republic of Congo: A cross-sectional study. PLoS Negl Trop Dis 13(9): e0007047. https://doi.org/10.1371/journal.pntd.0007047

Editor: Stuart D. Blacksell, Mahidol Univ, Fac Trop Med, THAILAND

Received: November 28, 2018; Accepted: August 6, 2019; Published: September 5, 2019

Copyright: © 2019 Proesmans et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Data Availability: All relevant data are within the manuscript and its Supporting Information files.

Funding: This study was co-funded by the framework agreement between the Institute of Tropical Medicine and the Belgian development cooperation (https://www.itg.be/E/cooperation) to VV and Vlaamse Interuniversitaire Raad – Universitaire Ontwikkelingssamenwerking (https://www.vliruos.be/en) (VLIR-UOS, Grant reference ZRDC2014MP083) to JPVG. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing interests: The authors have declared that no competing interests exist.

Keywords: Arbovirus; Dengue fever; Chikungunya fever; Malaria; Serology; Seroprevalence; DRC.

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Decreased #humoral #immunity to #mumps in young #adults immunized with #MMR #vaccine in #childhood (Proc Natl Acad Sci USA, abstract)

[Source: Proceedings of the National Academy of Sciences of the United States of America, full page: (LINK). Abstract, edited.]

Decreased humoral immunity to mumps in young adults immunized with MMR vaccine in childhood

Mohammed Ata Ur Rasheed, Carole J. Hickman, Marcia McGrew, Sun Bae Sowers, Sara Mercader, Amy Hopkins, Vickie Grimes, Tianwei Yu, Jens Wrammert, Mark J. Mulligan, William J. Bellini, Paul A. Rota, Walter A. Orenstein, Rafi Ahmed, and Srilatha Edupuganti

PNAS first published September 3, 2019 / DOI: https://doi.org/10.1073/pnas.1905570116

Contributed by Rafi Ahmed, July 18, 2019 (sent for review April 2, 2019; reviewed by Rino Rappuoli and Robert Seder)

 

Significance

The live-attenuated mumps-measles-rubella (MMR) vaccine has been highly successful in the United States since its introduction 47 years ago. However, for the past decade, mumps outbreaks have been occurring among young adults who were vaccinated as children. Waning immunity has been proposed as a key contributing factor to mumps resurgence. In our sample (n = 71) of 18- to 23-year-old college students, the majority had detectable mumps IgG antibodies by enzyme-linked immunosorbent assay (ELISA) but the magnitude was lower than rubella. Neutralizing antibody titers were 6-fold lower to a circulating genotype G mumps strain versus the vaccine strain. Ten percent of our participants had no detectable memory B cells to mumps. Strategies are needed to improve immunity to the mumps vaccine.

 

Abstract

In the past decade, multiple mumps outbreaks have occurred in the United States, primarily in close-contact, high-density settings such as colleges, with a high attack rate among young adults, many of whom had the recommended 2 doses of mumps-measles-rubella (MMR) vaccine. Waning humoral immunity and the circulation of divergent wild-type mumps strains have been proposed as contributing factors to mumps resurgence. Blood samples from 71 healthy 18- to 23-year-old college students living in a non-outbreak area were assayed for antibodies and memory B cells (MBCs) to mumps, measles, and rubella. Seroprevalence rates of mumps, measles, and rubella determined by IgG enzyme-linked immunosorbent assay (ELISA) were 93, 93, and 100%, respectively. The index standard ratio indicated that the concentration of IgG was significantly lower for mumps than rubella. High IgG avidity to mumps Enders strain was detected in sera of 59/71 participants who had sufficient IgG levels. The frequency of circulating mumps-specific MBCs was 5 to 10 times lower than measles and rubella, and 10% of the participants had no detectable MBCs to mumps. Geometric mean neutralizing antibody titers (GMTs) by plaque reduction neutralization to the predominant circulating wild-type mumps strain (genotype G) were 6-fold lower than the GMTs against the Jeryl Lynn vaccine strain (genotype A). The majority of the participants (80%) received their second MMR vaccine ≥10 years prior to study participation. Additional efforts are needed to fully characterize B and T cell immune responses to mumps vaccine and to develop strategies to improve the quality and durability of vaccine-induced immunity.

mumps, measles, rubella – MMR vaccine – memory B cells (MBCs) – plaque reduction  -neutralization titers – IgG ELISA

 

Footnotes

1 To whom correspondence may be addressed. Email: rahmed@emory.edu or sedupug@emory.edu.

Author contributions: M.A.U.R., C.J.H., W.J.B., W.A.O., R.A., J.W., and S.E. designed research; M.A.U.R., C.J.H., M.M., S.B.S., S.M., A.H., V.G., and S.E. performed research; M.A.U.R., C.J.H., S.B.S., S.M., T.Y., and S.E. analyzed data; and M.A.U.R., C.J.H., J.W., M.J.M., W.J.B., P.A.R., W.A.O., R.A., and S.E. wrote the paper.

Reviewers: R.R., GlaxoSmithKline; and R.S., NIH.

The authors declare no conflict of interest.

This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1905570116/-/DCSupplemental.

Published under the PNAS license.

Keywords: Mumps; Vaccines; Serology; Seroprevalence; Immunoglobulins.

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#Enterovirus D68 #serosurvey: evidence for #endemic circulation in the #Netherlands, 2006 to 2016 (Euro Surveill., abstract)

[Source: Eurosurveillance, full page: (LINK). Abstract, edited.]

Enterovirus D68 serosurvey: evidence for endemic circulation in the Netherlands, 2006 to 2016

Eveliina Karelehto1, Gerrit Koen1, Kimberley Benschop2, Fiona van der Klis2, Dasja Pajkrt3, Katja Wolthers1

Affiliations: 1 Department of Medical Microbiology, Laboratory of Clinical Virology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, the Netherlands; 2 National Institute for Public Health and the Environment, Bilthoven, the Netherlands; 3 Department of Pediatric Infectious Diseases, Emma Children’s Hospital, University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands

Correspondence:  Katja C Wolthers

Citation style for this article: Karelehto Eveliina, Koen Gerrit, Benschop Kimberley, van der Klis Fiona, Pajkrt Dasja, Wolthers Katja. Enterovirus D68 serosurvey: evidence for endemic circulation in the Netherlands, 2006 to 2016. Euro Surveill. 2019;24(35):pii=1800671. https://doi.org/10.2807/1560-7917.ES.2019.24.35.1800671

Received: 12 Dec 2018;   Accepted: 05 Jun 2019

 

Abstract

Background

Enterovirus D68 (EV-D68) has caused major outbreaks of severe respiratory illness worldwide since 2010.

Aim

Our aim was to evaluate EV-D68 circulation in the Netherlands by conducting a serosurvey of EV-D68 neutralising antibodies (nAb) among the Dutch general population.

Methods

We screened 280 sera from children and adults in the Netherlands and used two independent sets of samples collected in the years 2006 and 2007 and in the years 2015 and 2016, time points before and after the first EV-D68 upsurge in 2010. Neutralisation capacity of the sera was tested against the prototype Fermon EV-D68 strain isolated in 1962 and against a recent EV-D68 strain (genotype B3) isolated in France in 2016.

Results

Regardless of the time of serum collection, we found remarkably high overall seropositivity (94.3–98.3%) for nAb against both EV-D68 strains. Geometric mean titres increased in an age-dependent manner.

Conclusions

Our data suggest that EV-D68 has been circulating in the Netherlands for decades and that the enterovirus surveillance does not accurately capture the prevalence of this clinically relevant pathogen.

©  This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords: Enterovirus; EV-D68; Pediatrics; Netherlands; Seroprevalence.

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