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Horton DB, Barrett ES, Roy J, Gennaro ML, Andrews T, Greenberg P, Bruiners N, Datta P, Ukey R, Velusamy SK, Fine D, Honnen WJ, Yin YS, Pinter A, Brooks A, Tischfield J, Hussain S, Jagpal S, Swaminathan S, Parmar V, Reilly N, Gaur S, Panettieri RA, Carson JL, Blaser MJ. Determinants and dynamics of SARS-CoV-2 infection in a diverse population: 6-month evaluation of a prospective cohort study. J Infect Dis 2021; 224:1345-1356. [PMID: 34387310 PMCID: PMC8436370 DOI: 10.1093/infdis/jiab411] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [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: 05/13/2021] [Accepted: 08/12/2021] [Indexed: 11/24/2022] Open
Abstract
Background We studied risk factors, antibodies, and symptoms of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in a diverse, ambulatory population. Methods A prospective cohort (n = 831) previously undiagnosed with SARS-CoV-2 infection underwent serial testing (SARS-CoV-2 polymerase chain reaction, immunoglobulin G [IgG]) for 6 months. Results Ninety-three participants (11.2%) tested SARS-CoV-2-positive: 14 (15.1%) asymptomatic, 24 (25.8%) severely symptomatic. Healthcare workers (n = 548) were more likely to become infected (14.2% vs 5.3%; adjusted odds ratio, 2.1; 95% confidence interval, 1.4–3.3) and severely symptomatic (29.5% vs 6.7%). IgG antibodies were detected after 79% of asymptomatic infections, 89% with mild-moderate symptoms, and 96% with severe symptoms. IgG trajectories after asymptomatic infections (slow increases) differed from symptomatic infections (early peaks within 2 months). Most participants (92%) had persistent IgG responses (median 171 days). In multivariable models, IgG titers were positively associated with symptom severity, certain comorbidities, and hospital work. Dyspnea and neurologic changes (including altered smell/taste) lasted ≥ 120 days in ≥ 10% of affected participants. Prolonged symptoms (frequently more severe) corresponded to higher antibody levels. Conclusions In a prospective, ethnically diverse cohort, symptom severity correlated with the magnitude and trajectory of IgG production. Symptoms frequently persisted for many months after infection. Clinical Trials Registration. NCT04336215.
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Affiliation(s)
- Daniel B Horton
- Department of Pediatrics, Rutgers Robert Wood Johnson Medical School; New Brunswick, NJ, USA.,Rutgers Center for Pharmacoepidemiology and Treatment Science, Institute for Health, Health Care Policy and Aging Research; New Brunswick, NJ, USA.,Department of Biostatistics and Epidemiology; Rutgers School of Public Health; Piscataway, NJ, USA
| | - Emily S Barrett
- Department of Biostatistics and Epidemiology; Rutgers School of Public Health; Piscataway, NJ, USA.,Environmental and Occupational Health Sciences Institute; Rutgers University; Piscataway, NJ, USA
| | - Jason Roy
- Department of Biostatistics and Epidemiology; Rutgers School of Public Health; Piscataway, NJ, USA
| | - Maria Laura Gennaro
- Public Health Research Institute; Department of Medicine; New Jersey Medical School; Rutgers University; Newark, NJ, USA
| | - Tracy Andrews
- Department of Biostatistics and Epidemiology; Rutgers School of Public Health; Piscataway, NJ, USA
| | - Patricia Greenberg
- Department of Biostatistics and Epidemiology; Rutgers School of Public Health; Piscataway, NJ, USA
| | - Natalie Bruiners
- Public Health Research Institute; Department of Medicine; New Jersey Medical School; Rutgers University; Newark, NJ, USA
| | - Pratik Datta
- Public Health Research Institute; Department of Medicine; New Jersey Medical School; Rutgers University; Newark, NJ, USA
| | - Rahul Ukey
- Public Health Research Institute; Department of Medicine; New Jersey Medical School; Rutgers University; Newark, NJ, USA
| | | | - Daniel Fine
- Rutgers School of Dental Medicine; Rutgers University; Newark, NJ, USA
| | - William J Honnen
- Public Health Research Institute; Department of Medicine; New Jersey Medical School; Rutgers University; Newark, NJ, USA
| | - Yue Sandra Yin
- Center for Advanced Biotechnology and Medicine; Rutgers University; Piscataway, NJ, USA
| | - Abraham Pinter
- Public Health Research Institute; Department of Medicine; New Jersey Medical School; Rutgers University; Newark, NJ, USA
| | - Andrew Brooks
- Infinity Biologix® and Human Genetics Institute of NJ and Department of Genetics, Rutgers University; Piscataway, NJ, USA
| | - Jay Tischfield
- Infinity Biologix® and Human Genetics Institute of NJ and Department of Genetics, Rutgers University; Piscataway, NJ, USA
| | - Sabiha Hussain
- Department of Medicine, Rutgers Robert Wood Johnson Medical School; New Brunswick, NJ, USA
| | - Sugeet Jagpal
- Department of Medicine, Rutgers Robert Wood Johnson Medical School; New Brunswick, NJ, USA
| | - Shobha Swaminathan
- Public Global Health Institute; Department of Medicine; New Jersey Medical School; Rutgers University; Newark, NJ, USA
| | - Veenat Parmar
- Department of Medicine, Rutgers Robert Wood Johnson Medical School; New Brunswick, NJ, USA
| | - Nancy Reilly
- Rutgers Institute for Translational Medicine & Science; New Brunswick, NJ, USA
| | - Sunanda Gaur
- Department of Pediatrics, Rutgers Robert Wood Johnson Medical School; New Brunswick, NJ, USA
| | | | - Jeffrey L Carson
- Department of Medicine, Rutgers Robert Wood Johnson Medical School; New Brunswick, NJ, USA
| | - Martin J Blaser
- Center for Advanced Biotechnology and Medicine; Rutgers University; Piscataway, NJ, USA
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Fine DH, Patil AG, Velusamy SK. Aggregatibacter actinomycetemcomitans ( Aa) Under the Radar: Myths and Misunderstandings of Aa and Its Role in Aggressive Periodontitis. Front Immunol 2019; 10:728. [PMID: 31040843 PMCID: PMC6476972 DOI: 10.3389/fimmu.2019.00728] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [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: 10/18/2018] [Accepted: 03/19/2019] [Indexed: 11/23/2022] Open
Abstract
Aggregatibacter actinomycetemcomitans (Aa) is a low-abundance Gram-negative oral pathobiont that is highly associated with a silent but aggressive orphan disease that results in periodontitis and tooth loss in adolescents of African heritage. For the most part Aa conducts its business by utilizing strategies allowing it to conceal itself below the radar of the host mucosal immune defense system. A great deal of misinformation has been conveyed with respect to Aa biology in health and disease. The purpose of this review is to present misconceptions about Aa and the strategies that it uses to colonize, survive, and evade the host. In the process Aa manages to undermine host mucosal defenses and contribute to disease initiation. This review will present clinical observational, molecular, and interventional studies that illustrate genetic, phenotypic, and biogeographical tactics that have been recently clarified and demonstrate how Aa survives and suppresses host mucosal defenses to take part in disease pathogenesis. At one point in time Aa was considered to be the causative agent of Localized Aggressive Periodontitis. Currently, it is most accurate to look at Aa as a community activist and necessary partner of a pathogenic consortium that suppresses the initial host response so as to encourage overgrowth of its partners. The data for Aa's activist role stems from molecular genetic studies complemented by experimental animal investigations that demonstrate how Aa establishes a habitat (housing), nutritional sustenance in that habitat (food), and biogeographical mobilization and/or relocation from its initial habitat (transportation). In this manner Aa can transfer to a protected but vulnerable domain (pocket or sulcus) where its community activism is most useful. Aa's “strategy” includes obtaining housing, food, and transportation at no cost to its partners challenging the economic theory that “there ain't no such thing as a free lunch.” This “strategy” illustrates how co-evolution can promote Aa's survival, on one hand, and overgrowth of community members, on the other, which can result in local host dysbiosis and susceptibility to infection.
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Affiliation(s)
- Daniel H Fine
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ, United States
| | - Amey G Patil
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ, United States
| | - Senthil K Velusamy
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ, United States
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Velusamy SK, Sampathkumar V, Godboley D, Fine DH. Survival of an Aggregatibacter actinomycetemcomitans quorum sensing luxS mutant in the mouths of Rhesus monkeys: insights into ecological adaptation. Mol Oral Microbiol 2017; 32:432-442. [PMID: 28383798 DOI: 10.1111/omi.12184] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Experiments were designed to explore a prominent autoinducer-2 (AI-2) producing gene (luxS) related to colonization and survival of Aggregatibacter actinomycetemcomitans, a low abundance member of the indigenous flora, that forms a key component of the dysbiotic flora in localized aggressive periodontitis. The luxS gene was disrupted in a primate strain of A. actinomycetemcomitans before implantation into the oral cavity of Rhesus monkeys (Rh). The colonization efficiency of the luxS mutant (RhAa-VS4) was compared with the parental wild-type strain (RhAa3) (positive control) and a ltxA mutant (RhAa-VS2) (negative control). The in vivo results showed that the luxS mutation had minimal impact on A. actinomycetemcomitans colonization compared with the wild-type RhAa3 strain. In vitro studies revealed that there was a significant upregulation of attachment-related genes aae, apiA, and flp in the RhAa-VS4 strain compared with RhAa3. Biofilm forming ability was also significantly increased in the RhAa-VS4 strain compared with RhAa3, whereas the AI-2 signal was ablated. The exogenous addition of the AI-2 precursor dihydroxy pentanedione allowed the RhAa-VS4 strain to achieve RhAa3 biofilm levels. This is the first primate study to test the relevance of LuxS in vivo. In vitro assessment suggests that in vivo survival of the RhAa-VS4 strain was due to the production of signaling AI-2 molecules derived from other members of the flora as well as the upregulation of genes related to attachment and biofilm formation.
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Affiliation(s)
- Senthil K Velusamy
- Department of Oral Biology, Rutgers School of Dental Medicine, Rutgers University, Newark, NJ, USA
| | - Vandana Sampathkumar
- Department of Oral Biology, Rutgers School of Dental Medicine, Rutgers University, Newark, NJ, USA
| | - Dipti Godboley
- Department of Oral Biology, Rutgers School of Dental Medicine, Rutgers University, Newark, NJ, USA
| | - Daniel H Fine
- Department of Oral Biology, Rutgers School of Dental Medicine, Rutgers University, Newark, NJ, USA
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Velusamy SK, Ganeshnarayan K, Markowitz K, Schreiner H, Furgang D, Fine DH, Velliyagounder K. Lactoferrin knockout mice demonstrates greater susceptibility to Aggregatibacter actinomycetemcomitans-induced periodontal disease. J Periodontol 2013; 84:1690-701. [PMID: 23327622 DOI: 10.1902/jop.2013.120587] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Among the innate defense mechanisms in the oral cavity, lactoferrin (LF) is a vital antimicrobial that can modify the host response against periodontopathogens. Aggregatibacter actinomycetemcomitans is the main periodontopathogen of localized aggressive periodontitis. The aim of this study is to evaluate the role of LF during A. actinomycetemcomitans-induced periodontitis. METHODS Differences in the expression levels of cytokines, chemokines, chemokine receptors, and bone loss markers between wild-type (WT) and LF knockout mice (LFKO(-/-)) were evaluated by real time-PCR. Serum IgG and LF levels were quantified by ELISA. Alveolar bone loss among the groups was estimated by measuring the distance from cemento-enamel junction (CEJ) to the alveolar bone crest (ABC) at 20 molar sites. RESULTS Oral infection with A. actinomycetemcomitans increased LF levels in periodontal tissue (P = 0.01) and saliva (P = 0.0004) of wild-type infected (WTI) mice compared to wild-type control mice. Pro-inflammatory cytokines such as interferon-γ, tumor necrosis factor-α, interleukin (IL)-1β, IL-6, and IL-12 were increased in the infected LF knockout (LFKO(-/-)I) mice compared to the WTI mice, whereas the anti-inflammatory cytokines IL-4 and IL-10 were decreased. Chemokines and chemokine receptors showed different expression patterns between WTI and LFKO(-/-)I mice. The LFKO(-/-)I mice developed increased bone loss (P = 0.002), in conjunction with increased expression of receptor activator of nuclear factor-κB ligand and decrease in osteoprotegerin, compared to WTI mice. CONCLUSIONS These results demonstrate that the infected LFKO(-/-) mice were more susceptible to A. actinomycetemcomitans-induced alveolar bone loss, with different patterns of immune responses compared to those of WTI mice.
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Affiliation(s)
- S K Velusamy
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ
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