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Dahl AM, Brown CE, Brown ER, O'Brien MP, Barnabas RV. Concordance between SARS-CoV-2 index individuals and their household contacts on index individual COVID-19 transmission cofactors: a comparison of self-reported and contact-reported information. BMC Public Health 2024; 24:950. [PMID: 38566051 PMCID: PMC10986086 DOI: 10.1186/s12889-024-18371-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 03/17/2024] [Indexed: 04/04/2024] Open
Abstract
BACKGROUND Following the outbreak of the COVID-19 pandemic, several clinical trials have evaluated postexposure prophylaxis (PEP) among close contacts of an index individual with a confirmed SARS-CoV-2 infection. Because index individuals do not directly inform the efficacy of prevention interventions, they are seldom enrolled in COVID-19 PEP studies. However, adjusting for prognostic covariates such as an index individual's COVID-19 illness and risk behaviors can increase precision in PEP efficacy estimates, so approaches to accurately collecting this information about the index individual are needed. This analysis aimed to assess whether surveying household contacts captures the same information as surveying the index individual directly. METHODS REGN 2069/CoVPN 3502, a randomized controlled trial of COVID-19 PEP, enrolled household contacts of SARS-CoV-2 index individuals. CoVPN 3502-01 retrospectively enrolled and surveyed the index individuals. We compared responses to seven similar questions about the index individuals' transmission cofactors that were asked in both studies. We estimated the percent concordance between index individuals and their household contacts on each question, with 50% concordance considered equivalent to random chance. RESULTS Concordance between index individuals and contacts was high on the most objective questions, approximately 97% (95% CI: 90-99%) for index individual age group and 96% (88-98%) for hospitalization. Concordance was moderate for symptoms, approximately 85% (75-91%). Concordance on questions related to the index individual's behavior was only slightly better or no better than random: approximately 62% (51-72%) for whether they received COVID-19 treatment, 68% (57-77%) for sharing a bedroom, 70% (59-79%) for sharing a common room, and 49% (39-60%) for mask wearing at home. However, while contacts were surveyed within 96 h of the index individual testing positive for SARS-CoV-2, the median time to enrollment in CoVPN 3502-01 was 240 days, which may have caused recall bias in our results. CONCLUSIONS Our results suggest a need to survey index individuals directly in order to accurately capture their transmission cofactors, rather than relying on their household contacts to report on their behavior. The lag in enrolling participants into CoVPN 3502-01 also highlights the importance of timely enrollment to minimize recall bias.
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Affiliation(s)
- Angela M Dahl
- Department of Biostatistics, University of Washington, Seattle, WA, US.
| | - Clare E Brown
- Department of Global Health, University of Washington, Seattle, WA, US
| | - Elizabeth R Brown
- Department of Biostatistics, University of Washington, Seattle, WA, US
- Vaccine and Infectious Disease Division and Public Health Sciences Division, Fred Hutchinson Cancer Center, Seattle, WA, US
| | | | - Ruanne V Barnabas
- Division of Infectious Diseases, Massachusetts General Hospital, Harvard Medical School, Boston, MA, US
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Bershteyn A, Dahl AM, Dong TQ, Deming ME, Celum CL, Chu HY, Kottkamp AC, Greninger AL, Hoffman RM, Jerome KR, Johnston CM, Kissinger PJ, Landovitz RJ, Laufer MK, Luk A, Neuzil KM, Paasche-Orlow MK, Pitts RA, Schwartz MD, Stankiewicz Karita HC, Thorpe LE, Wald A, Zheng CY, Wener MH, Barnabas RV, Brown ER. Self-Assessed Severity as a Determinant of Coronavirus Disease 2019 Symptom Specificity: A Longitudinal Cohort Study. Clin Infect Dis 2022; 75:e1180-e1183. [PMID: 35152299 PMCID: PMC8903379 DOI: 10.1093/cid/ciac129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Indexed: 01/19/2023] Open
Abstract
Coronavirus disease 2019 symptom definitions rarely include symptom severity. We collected daily nasal swab samples and symptom diaries from contacts of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) case patients. Requiring ≥1 moderate or severe symptom reduced sensitivity to predict SARS-CoV-2 shedding from 60.0% (95% confidence interval [CI], 52.9%-66.7%) to 31.5% (95% CI, 25.7%- 38.0%) but increased specificity from 77.5% (95% CI, 75.3%-79.5%) to 93.8% (95% CI, 92.7%-94.8%).
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Affiliation(s)
- Anna Bershteyn
- Correspondence: A. Bershteyn, Department of Population Health, New York University Grossman School of Medicine, 227 E 30th St, New York, NY 10016 ()
| | | | - Tracy Q Dong
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Meagan E Deming
- Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Connie L Celum
- International Clinical Research Center and Department of Global Health, University of Washington, Seattle, Washington, USA
| | - Helen Y Chu
- Department of Medicine and Department of Epidemiology, University of Washington, Seattle, Washington, USA
| | - Angelica C Kottkamp
- Department of Medicine, New York University Grossman School of Medicine, New York, New York, USA
| | - Alexander L Greninger
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA,Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
| | - Risa M Hoffman
- Department of Medicine and Division of Infectious Diseases, University of California, Los Angeles, California, USA
| | - Keith R Jerome
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA,Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
| | - Christine M Johnston
- Department of Medicine and Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
| | - Patricia J Kissinger
- Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, Louisiana, USA
| | - Raphael J Landovitz
- Center for Clinical AIDS Research & Education, University of California, Los Angeles, California, USA
| | - Miriam K Laufer
- Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Alfred Luk
- John W. Deming Department of Medicine, Tulane University School of Medicine, New Orleans, Louisiana, USA
| | - Kathleen M Neuzil
- Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Michael K Paasche-Orlow
- Department of Medicine and Boston Medical Center, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Robert A Pitts
- Department of Medicine and Division of Infectious Diseases, NYC Health & Hospitals/Bellevue, New York, New York, USA
| | - Mark D Schwartz
- Department of Population Health, New York University Grossman School of Medicine, New York, New York, USA
| | | | - Lorna E Thorpe
- Department of Population Health, New York University Grossman School of Medicine, New York, New York, USA
| | - Anna Wald
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA,Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA,Department of Medicine, Department of Epidemiology, Seattle, Washington, USA
| | - Crystal Y Zheng
- John W. Deming Department of Medicine, Tulane University School of Medicine, New Orleans, Louisiana, USA
| | - Mark H Wener
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
| | - Ruanne V Barnabas
- Department of Global Health and Department of Medicine, University of Washington, Seattle, Washington, USA,Division of Infectious Diseases, Massachusetts General Hospital, Boston, Massachusetts, USAand
| | - Elizabeth R Brown
- Department of Biostatistics, University of Washington, Seattle, Washington, USA,Vaccine and Infectious Disease Division and Public Health Sciences Division, Fred Hutchinson Cancer Research Center, USA
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Dahl AM, Beverley PC, Stauss HJ. A synthetic peptide derived from the tumor-associated protein mdm2 can stimulate autoreactive, high avidity cytotoxic T lymphocytes that recognize naturally processed protein. J Immunol 1996; 157:239-46. [PMID: 8683121] [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] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Studies in melanoma patients have shown that unaltered self proteins can function as targets for tumor-reactive CTL. Here, we have investigated in a murine model whether autoreactive CTL can be found against the widely expressed proteins cyclin D1, mdm2, and p53, which are frequently overexpressed in transformed cells. Sixteen MHC class I binding peptides were identified in these proteins, and seven of them consistently stimulated primary CTL in vitro. Avidity measurements revealed that the avidity of peptide-induced CTL differed by >1000-fold. The highest avidity CTL were induced by a peptide derived from mdm2. These CTL recognized target cells expressing mdm2 endogenously, while CTL generated against the remaining peptides were of lower avidity and did not recognize cells expressing relevant proteins endogenously. Generation of high avidity anti-mdm2 CTL required several cycles of peptide stimulation, suggesting that the CTL precursor frequency was low. The data show the normal T cell repertoire contains small numbers of potentially autoreactive CTL. Expansion of these CTL may lead to beneficial autoimmunity against tumors, but, equally, it may be the basis of detrimental autoimmune diseases.
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Affiliation(s)
- A M Dahl
- Tumor Immunology Unit, University College London Medical School, United Kingdom
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Dahl AM, Beverley PC, Stauss HJ. A synthetic peptide derived from the tumor-associated protein mdm2 can stimulate autoreactive, high avidity cytotoxic T lymphocytes that recognize naturally processed protein. The Journal of Immunology 1996. [DOI: 10.4049/jimmunol.157.1.239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Studies in melanoma patients have shown that unaltered self proteins can function as targets for tumor-reactive CTL. Here, we have investigated in a murine model whether autoreactive CTL can be found against the widely expressed proteins cyclin D1, mdm2, and p53, which are frequently overexpressed in transformed cells. Sixteen MHC class I binding peptides were identified in these proteins, and seven of them consistently stimulated primary CTL in vitro. Avidity measurements revealed that the avidity of peptide-induced CTL differed by >1000-fold. The highest avidity CTL were induced by a peptide derived from mdm2. These CTL recognized target cells expressing mdm2 endogenously, while CTL generated against the remaining peptides were of lower avidity and did not recognize cells expressing relevant proteins endogenously. Generation of high avidity anti-mdm2 CTL required several cycles of peptide stimulation, suggesting that the CTL precursor frequency was low. The data show the normal T cell repertoire contains small numbers of potentially autoreactive CTL. Expansion of these CTL may lead to beneficial autoimmunity against tumors, but, equally, it may be the basis of detrimental autoimmune diseases.
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Affiliation(s)
- A M Dahl
- Tumor Immunology Unit, University College London Medical School, United Kingdom
| | - P C Beverley
- Tumor Immunology Unit, University College London Medical School, United Kingdom
| | - H J Stauss
- Tumor Immunology Unit, University College London Medical School, United Kingdom
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Douglas CM, Foor F, Marrinan JA, Morin N, Nielsen JB, Dahl AM, Mazur P, Baginsky W, Li W, el-Sherbeini M. The Saccharomyces cerevisiae FKS1 (ETG1) gene encodes an integral membrane protein which is a subunit of 1,3-beta-D-glucan synthase. Proc Natl Acad Sci U S A 1994; 91:12907-11. [PMID: 7528927 PMCID: PMC45549 DOI: 10.1073/pnas.91.26.12907] [Citation(s) in RCA: 294] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
In Saccharomyces cerevisiae, mutations in FKS1 confer hypersensitivity to the immunosuppressants FK506 and cyclosporin A, while mutations in ETG1 confer resistance to the cell-wall-active echinocandins (inhibitors of 1,3-beta-D-glucan synthase) and, in some cases, concomitant hypersensitivity to the chitin synthase inhibitor nikkomycin Z. The FKS1 and ETG1 genes were cloned by complementation of these phenotypes and were found to be identical. Disruption of the gene results in (i) a pronounced slow-growth phenotype, (ii) hypersensitivity to FK506 and cyclosporin A, (iii) a slight increase in sensitivity to echinocandin, and (iv) a significant reduction in 1,3-beta-D-glucan synthase activity in vitro. The nucleotide sequence encodes a 215-kDa polypeptide predicted to be an integral membrane protein with 16 transmembrane helices, consistent with previous observations that the etg1-1 mutation results in echinocandin-resistant glucan synthase activity associated with the nonextractable membrane fraction of the enzyme. These results suggest that FKS1 encodes a subunit of 1,3-beta-D-glucan synthase. The residual activity present in the disruption mutant, the nonessential nature of the gene, and results of Southern blot hybridization analysis point to the existence of a glucan synthase isozyme.
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Affiliation(s)
- C M Douglas
- Merck Research Laboratoies, Rohway, NJ 07065
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Parent SA, Nielsen JB, Morin N, Chrebet G, Ramadan N, Dahl AM, Hsu MJ, Bostian KA, Foor F. Calcineurin-dependent growth of an FK506- and CsA-hypersensitive mutant of Saccharomyces cerevisiae. J Gen Microbiol 1993; 139:2973-84. [PMID: 7510323 DOI: 10.1099/00221287-139-12-2973] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The immunosuppressants FK506 and cyclosporin A (CsA) bound to their receptors, FKBP12 or cyclophilin, inhibit the Ca2+/calmodulin-dependent protein phosphatase, calcineurin, preventing T cell activation or, in yeast, recovery from alpha-mating factor arrest. Vegetative growth of yeast does not require calcineurin, and in strains sensitive to FK506 or CsA, growth is inhibited by concentrations of drug much higher than those required to inhibit T cell activation or recovery from mating factor arrest. We now describe the isolation of a mutant of Saccharomyces cerevisiae which is 100-1000-fold more sensitive to the growth inhibitory properties of these drugs. The mutation (fks1) also confers a slow growth phenotype which is partially suppressed by exogenously added Ca2+ and exacerbated by EGTA. Simultaneous disruption of the two genes (CNA1 and CNA2) encoding the alternative forms of the catalytic A subunit of calcineurin, or of the gene (CNB1) encoding the regulatory B subunit, is lethal in an fks1 mutant. Disruption of the gene encoding FKBP12 (FKB1) or the major, cytosolic cyclophilin (CPH1) in fks1 cells results in the loss of hypersensitivity to the relevant drug. Overexpression of CNA1 or CNA2, in conjunction with CNB1, results in a significant decrease in hypersensitivity to FK506 and CsA. The results show that the hypersensitivity of the fks1 mutant is due to the inhibition of calcineurin phosphatase activity by the receptor-drug complexes. The growth dependence of the mutant on the Ca2+/calcineurin signal pathway provides an important tool for studying in yeast certain aspects of immune suppression by these drugs.
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Affiliation(s)
- S A Parent
- Merck Research Laboratories, Rahway, NJ 07065
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Nielsen JB, Foor F, Siekierka JJ, Hsu MJ, Ramadan N, Morin N, Shafiee A, Dahl AM, Brizuela L, Chrebet G. Yeast FKBP-13 is a membrane-associated FK506-binding protein encoded by the nonessential gene FKB2. Proc Natl Acad Sci U S A 1992; 89:7471-5. [PMID: 1380159 PMCID: PMC49732 DOI: 10.1073/pnas.89.16.7471] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The immunosuppressants FK506 and rapamycin prevent T-cell activation and also inhibit the growth of certain strains of the yeast Saccharomyces cerevisiae. It has previously been shown that yeast contains a 12-kDa cytosolic FK506-binding protein (yFKBP-12), which also possesses peptidylprolyl cis-trans isomerase activity, and that fkb1 strains lacking yFKBP-12 are resistant to rapamycin and sensitive to FK506. The absence of yFKBP-12 permitted the detection and isolation of a second FK506- and rapamycin-binding protein, which is about 13 kDa in size (yFKBP-13) and membrane-associated. Purified yFKBP-13 binds FK506 with 15-fold lower affinity than yFKBP-12 and has peptidylprolyl cis-trans isomerase activity with a similar substrate profile. The sequence of the first 37 N-terminal amino acids was determined, and the yFKBP-13 gene (FKB2) was cloned and sequenced. A hydrophobic putative signal sequence precedes the N terminus of the mature protein. yFKBP-13 most closely resembles the membrane-associated human FKBP-13, which also possesses a signal peptide, whereas yFKBP-12 most closely resembles human FKBP-12. fkb2 and fkb1 fkb2 mutants are viable and unaltered in their sensitivity to FK506, suggesting that yeast possesses an additional target for this drug. Furthermore, fkb2 null mutations confer no change in rapamycin sensitivity. These findings show that yFKBP-13 and yFKBP-12 have distinct functions within the cell.
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Affiliation(s)
- J B Nielsen
- Merck Research Laboratories, Rahway, NJ 07065
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