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Lambrechts L, Reiner RC, Briesemeister MV, Barrera P, Long KC, Elson WH, Vizcarra A, Astete H, Bazan I, Siles C, Vilcarromero S, Leguia M, Kawiecki AB, Perkins TA, Lloyd AL, Waller LA, Kitron U, Jenkins SA, Hontz RD, Campbell WR, Carrington LB, Simmons CP, Ampuero JS, Vasquez G, Elder JP, Paz-Soldan VA, Vazquez-Prokopec GM, Rothman AL, Barker CM, Scott TW, Morrison AC. Direct mosquito feedings on dengue-2 virus-infected people reveal dynamics of human infectiousness. PLoS Negl Trop Dis 2023; 17:e0011593. [PMID: 37656759 PMCID: PMC10501553 DOI: 10.1371/journal.pntd.0011593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 09/14/2023] [Accepted: 08/14/2023] [Indexed: 09/03/2023] Open
Abstract
Dengue virus (DENV) transmission from humans to mosquitoes is a poorly documented, but critical component of DENV epidemiology. Magnitude of viremia is the primary determinant of successful human-to-mosquito DENV transmission. People with the same level of viremia, however, can vary in their infectiousness to mosquitoes as a function of other factors that remain to be elucidated. Here, we report on a field-based study in the city of Iquitos, Peru, where we conducted direct mosquito feedings on people naturally infected with DENV and that experienced mild illness. We also enrolled people naturally infected with Zika virus (ZIKV) after the introduction of ZIKV in Iquitos during the study period. Of the 54 study participants involved in direct mosquito feedings, 43 were infected with DENV-2, two with DENV-3, and nine with ZIKV. Our analysis excluded participants whose viremia was detectable at enrollment but undetectable at the time of mosquito feeding, which was the case for all participants with DENV-3 and ZIKV infections. We analyzed the probability of onward transmission during 50 feeding events involving 27 participants infected with DENV-2 based on the presence of infectious virus in mosquito saliva 7-16 days post blood meal. Transmission probability was positively associated with the level of viremia and duration of extrinsic incubation in the mosquito. In addition, transmission probability was influenced by the day of illness in a non-monotonic fashion; i.e., transmission probability increased until 2 days after symptom onset and decreased thereafter. We conclude that mildly ill DENV-infected humans with similar levels of viremia during the first two days after symptom onset will be most infectious to mosquitoes on the second day of their illness. Quantifying variation within and between people in their contribution to DENV transmission is essential to better understand the biological determinants of human infectiousness, parametrize epidemiological models, and improve disease surveillance and prevention strategies.
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Affiliation(s)
- Louis Lambrechts
- Institut Pasteur, Université Paris Cité, CNRS UMR2000, Insect-Virus Interactions Unit, Paris, France
| | - Robert C. Reiner
- University of Washington, Seattle, Washington, United States of America
| | - M. Veronica Briesemeister
- Department of Entomology and Nematology, University of California, Davis, California, United States of America
| | - Patricia Barrera
- Department of Entomology and Nematology, University of California, Davis, California, United States of America
- Genomics Laboratory, Pontificia Universidad Católica del Peru, Lima, Peru
| | - Kanya C. Long
- Department of Family Medicine and Public Health, University of California San Diego School of Medicine, La Jolla, California, United States of America
| | - William H. Elson
- Department of Entomology and Nematology, University of California, Davis, California, United States of America
| | - Alfonso Vizcarra
- Department of Entomology and Nematology, University of California, Davis, California, United States of America
| | - Helvio Astete
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
- Department of Entomology, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Isabel Bazan
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Crystyan Siles
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Stalin Vilcarromero
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Mariana Leguia
- Genomics Laboratory, Pontificia Universidad Católica del Peru, Lima, Peru
| | - Anna B. Kawiecki
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
| | - T. Alex Perkins
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, United States of America
| | - Alun L. Lloyd
- Biomathematics Graduate Program and Department of Mathematics, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Lance A. Waller
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia, United States of America
| | - Uriel Kitron
- Department of Environmental Sciences, Emory University, Atlanta, Georgia, United States of America
| | - Sarah A. Jenkins
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Robert D. Hontz
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Wesley R. Campbell
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
| | | | - Cameron P. Simmons
- Institute for Vector-Borne Disease, Monash University, Clayton, Victoria, Australia
| | - J. Sonia Ampuero
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Gisella Vasquez
- Department of Entomology, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - John P. Elder
- School of Public Health, San Diego State University, San Diego, California, United States of America
| | - Valerie A. Paz-Soldan
- Department of Tropical Medicine, Tulane University School of Public Health and Tropical Medicine, New Orleans, Louisiana, United States of America
| | | | - Alan L. Rothman
- Institute for Immunology and Informatics and Department of Cell and Molecular Biology, University of Rhode Island, Providence, Rhode Island, United States of America
| | - Christopher M. Barker
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
| | - Thomas W. Scott
- Department of Entomology and Nematology, University of California, Davis, California, United States of America
| | - Amy C. Morrison
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, California, United States of America
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Morrison AC, Paz-Soldan VA, Vazquez-Prokopec GM, Lambrechts L, Elson WH, Barrera P, Astete H, Briesemeister V, Leguia M, Jenkins SA, Long KC, Kawiecki AB, Reiner RC, Perkins TA, Lloyd AL, Waller LA, Hontz RD, Stoddard ST, Barker CM, Kitron U, Elder JP, Rothman AL, Scott TW. Quantifying heterogeneities in arbovirus transmission: Description of the rationale and methodology for a prospective longitudinal study of dengue and Zika virus transmission in Iquitos, Peru (2014-2019). PLoS One 2023; 18:e0273798. [PMID: 36730229 PMCID: PMC9894416 DOI: 10.1371/journal.pone.0273798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 08/15/2022] [Indexed: 02/03/2023] Open
Abstract
Current knowledge of dengue virus (DENV) transmission provides only a partial understanding of a complex and dynamic system yielding a public health track record that has more failures than successes. An important part of the problem is that the foundation for contemporary interventions includes a series of longstanding, but untested, assumptions based on a relatively small portion of the human population; i.e., people who are convenient to study because they manifest clinically apparent disease. Approaching dengue from the perspective of people with overt illness has produced an extensive body of useful literature. It has not, however, fully embraced heterogeneities in virus transmission dynamics that are increasingly recognized as key information still missing in the struggle to control the most important insect-transmitted viral infection of humans. Only in the last 20 years have there been significant efforts to carry out comprehensive longitudinal dengue studies. This manuscript provides the rationale and comprehensive, integrated description of the methodology for a five-year longitudinal cohort study based in the tropical city of Iquitos, in the heart of the Peruvian Amazon. Primary data collection for this study was completed in 2019. Although some manuscripts have been published to date, our principal objective here is to support subsequent publications by describing in detail the structure, methodology, and significance of a specific research program. Our project was designed to study people across the entire continuum of disease, with the ultimate goal of quantifying heterogeneities in human variables that affect DENV transmission dynamics and prevention. Because our study design is applicable to other Aedes transmitted viruses, we used it to gain insights into Zika virus (ZIKV) transmission when during the project period ZIKV was introduced and circulated in Iquitos. Our prospective contact cluster investigation design was initiated by detecttion of a person with a symptomatic DENV infection and then followed that person's immediate contacts. This allowed us to monitor individuals at high risk of DENV infection, including people with clinically inapparent and mild infections that are otherwise difficult to detect. We aimed to fill knowledge gaps by defining the contribution to DENV transmission dynamics of (1) the understudied majority of DENV-infected people with inapparent and mild infections and (2) epidemiological, entomological, and socio-behavioral sources of heterogeneity. By accounting for factors underlying variation in each person's contribution to transmission we sought to better determine the type and extent of effort needed to better prevent virus transmission and disease.
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Affiliation(s)
- Amy C. Morrison
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
- * E-mail: ,
| | - Valerie A. Paz-Soldan
- Department of Tropical Medicine, Tulane University School of Public Health and Tropical Medicine, New Orleans, Lousiana, United States of America
| | | | - Louis Lambrechts
- Institut Pasteur, Université Paris Cité, CNRS UMR2000, Insect-Virus Interactions Unit, Paris, France
| | - William H. Elson
- Department of Entomology and Nematology, University of California Davis, Davis, California, United States of America
| | - Patricia Barrera
- Department of Entomology and Nematology, University of California Davis, Davis, California, United States of America
- Genomics Laboratory, Pontificia Universidad Católica del Peru, Lima, Peru
| | - Helvio Astete
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
- Department of Entomology, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Veronica Briesemeister
- Department of Entomology and Nematology, University of California Davis, Davis, California, United States of America
| | - Mariana Leguia
- Genomics Laboratory, Pontificia Universidad Católica del Peru, Lima, Peru
| | - Sarah A. Jenkins
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Kanya C. Long
- Department of Family Medicine and Public Health, University of California San Diego School of Medicine, La Jolla, California, United States of America
| | - Anna B. Kawiecki
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
| | - Robert C. Reiner
- University of Washington, Seattle, Washington, United States of America
| | - T. Alex Perkins
- Department of Biological Sciences and Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, United States of America
| | - Alun L. Lloyd
- Biomathematics Graduate Program and Department of Mathematics, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Lance A. Waller
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, Georgia, United States of America
| | - Robert D. Hontz
- Virology and Emerging Infections Department, United States Naval Medical Research Unit No. 6, Lima, Peru
| | - Steven T. Stoddard
- School of Public Health, San Diego State University, San Diego, California, United States of America
| | - Christopher M. Barker
- Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, California, United States of America
| | - Uriel Kitron
- Institut Pasteur, Université Paris Cité, CNRS UMR2000, Insect-Virus Interactions Unit, Paris, France
| | - John P. Elder
- School of Public Health, San Diego State University, San Diego, California, United States of America
| | - Alan L. Rothman
- Institute for Immunology and Informatics and Department of Cell and Molecular Biology, University of Rhode Island, Providence, Rhode Island, United States of America
| | - Thomas W. Scott
- Department of Entomology and Nematology, University of California Davis, Davis, California, United States of America
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Monteiro MA, Chen YH, Ma Z, Ewing CP, Mohamad Nor N, Omari E, Song E, Gabryelski P, Guerry P, Poly F. Relationships of capsular polysaccharides belonging to Campylobacter jejuni HS1 serotype complex. PLoS One 2021; 16:e0247305. [PMID: 33621246 PMCID: PMC7901785 DOI: 10.1371/journal.pone.0247305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 02/04/2021] [Indexed: 11/19/2022] Open
Abstract
The Campylobacter jejuni capsule type HS1 complex is one of the most common serotypes identified worldwide, and consists of strains typing as HS1, HS1/44, HS44 and HS1/8. The capsule structure of the HS1 type strain was shown previously to be composed of teichoic-acid like glycerol-galactosyl phosphate repeats [4-)-α-D-Galp-(1-2)-Gro-(1-P-] with non-stoichiometric fructose branches at the C2 and C3 of Gal and non-stoichiometric methyl phosphoramidate (MeOPN) modifications on the C3 of the fructose. Here, we demonstrate that the capsule of an HS1/44 strain is identical to that of the type strain of HS1, and the capsule of HS1/8 is also identical to HS1, except for an additional site of MeOPN modification at C6 of Gal. The DNA sequence of the capsule locus of an HS44 strain included an insertion of 10 genes, and the strain expressed two capsules, one identical to the HS1 type strain, but with no fructose branches, and another composed of heptoses and MeOPN. We also characterize a HS1 capsule biosynthesis gene, HS1.08, as a fructose transferase responsible for the attachment of the β-D-fructofuranoses residues at C2 and C3 of the Gal unit. In summary, the common component of all members of the HS1 complex is the teichoic-acid like backbone that is likely responsible for the observed sero-cross reactivity.
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Affiliation(s)
| | - Yu-Han Chen
- Dept. of Chemistry, University of Guelph, Guelph, Ontario, Canada
| | - Zuchao Ma
- Dept. of Chemistry, University of Guelph, Guelph, Ontario, Canada
| | - Cheryl P. Ewing
- Naval Medical Research Center, Silver Spring, Maryland, United States of America
| | | | - Eman Omari
- Dept. of Chemistry, University of Guelph, Guelph, Ontario, Canada
| | - Ellen Song
- Dept. of Chemistry, University of Guelph, Guelph, Ontario, Canada
| | - Pawel Gabryelski
- Dept. of Chemistry, University of Guelph, Guelph, Ontario, Canada
| | - Patricia Guerry
- Naval Medical Research Center, Silver Spring, Maryland, United States of America
| | - Frédéric Poly
- Naval Medical Research Center, Silver Spring, Maryland, United States of America
- * E-mail:
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