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Helgi Valdimarsson

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Chemicals & Drugs

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Enzyme-Linked Immunosorbent Assay

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S L Sigurdardottir; R H Thorleifsdottir; Helgi Valdimarsson; Andrew Johnston
The role of the palatine tonsils in the pathogenesis and treatment of psoriasis.
Thorvardur Jon Love; Helgi Valdimarsson; Johann Gudjonsson; Bjorn Gudbjornsson
Psoriatic arthritis and onycholysis -- results from the cross-sectional Reykjavik psoriatic arthritis study.
Ragna Hlin Thorleifsdottir; Sigurlaug Arnadottir; Johann Gudjonsson; Andrew Johnston; Jon H Olafsson; Hannes Petersen; Sigrun Laufey Sigurdardottir; Martin Ingi Sigurdsson; Bardur Sigurgeirsson; Helgi Valdimarsson
Improvement of psoriasis after tonsillectomy is associated with a decrease in the frequency of circulating T cells that recognize streptococcal determinants and homologous skin determinants.

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All Publications

2013: S L Sigurdardottir; R H Thorleifsdottir; Helgi Valdimarsson; Andrew Johnston
The role of the palatine tonsils in the pathogenesis and treatment of psoriasis.
The British journal of dermatology 2013;168(2):237-42.
2012: Thorvardur Jon Love; Helgi Valdimarsson; Johann Gudjonsson; Bjorn Gudbjornsson
Psoriatic arthritis and onycholysis -- results from the cross-sectional Reykjavik psoriatic arthritis study.
The Journal of rheumatology 2012;39(7):1441-4.
2012: Ragna Hlin Thorleifsdottir; Sigurlaug Arnadottir; Johann Gudjonsson; Andrew Johnston; Jon H Olafsson; Hannes Petersen; Sigrun Laufey Sigurdardottir; Martin Ingi Sigurdsson; Bardur Sigurgeirsson; Helgi Valdimarsson
Improvement of psoriasis after tonsillectomy is associated with a decrease in the frequency of circulating T cells that recognize streptococcal determinants and homologous skin determinants.
Journal of immunology (Baltimore, Md. : 1950) 2012;188(10):5160-5.
2012: Anna Freyja Finnbogadóttir; Birgir Hrafnkelsson; Björn Rúnar Lúðvíksson; Helgi Valdimarsson; Björn Árdal; Herbert Eiríksson; Ásgeir Haraldsson
A long-term follow-up of allergic diseases in Iceland.
Pediatric allergy and immunology : official publication of the European Society of Pediatric Allergy and Immunology 2012;23(2):181-5.
2012: Sigrun L Sigurdardottir; Ragna H Thorleifsdottir; Helgi Valdimarsson; Gudmundur H Gudmundsson; Andrew M Guzman; Andrew Johnston
The anti-microbial peptide LL-37 modulates immune responses in the palatine tonsils where it is exclusively expressed by neutrophils and a subset of dendritic cells.
Clinical immunology (Orlando, Fla.) 2012;142(2):139-49.
2011: Saedis Saevarsdottir; Kristjan Steinsson; Helgi Valdimarsson; Lars Alfredsson; Bo Ding; Gerdur Grondal; Lars Klareskog; Leonid Padyukov
Mannan Binding Lectin (MBL) genotypes coding for high MBL serum levels are associated with rheumatoid factor negative rheumatoid arthritis in never smokers.
Arthritis research & therapy 2011;13(2):R65.
2010: Gunnar Tomasson; Thor Aspelund; Thorbjorn Jonsson; Helgi Valdimarsson; David T Felson; Vilmundur Gudnason
Effect of rheumatoid factor on mortality and coronary heart disease.
Annals of the rheumatic diseases 2010;69(9):1649-54.
2009: Helgi Valdimarsson; Ragna H Thorleifsdottir; Sigrun L Sigurdardottir; Johann Gudjonsson; Andrew Johnston
Psoriasis--as an autoimmune disease caused by molecular mimicry.
Trends in immunology 2009;30(10):494-501.
2008: Helga Kristjansdottir; Saedis Saevarsdottir; Gerdur Gröndal; Marta E Alarcón-Riquelme; Kristjan Erlendsson; Helgi Valdimarsson; Kristjan Steinsson
Association of three systemic lupus erythematosus susceptibility factors, PD-1.3A, C4AQ0, and low levels of mannan-binding lectin, with autoimmune manifestations in Icelandic multicase systemic lupus erythematosus families.
Arthritis and rheumatism 2008;58(12):3865-72.
2008: Damon P Eisen; Melinda M Dean; Marja A Boermeester; Katy J Fidler; Anthony Gordon; Gitte Kronborg; Jürgen Kun; Yu-Lung Lau; Antonis Payeras; Helgi Valdimarsson; Stephen J Brett; W K Eddie Ip; Joan Mila; Mark J Peters; Saedis Saevarsdottir; Jan Van Till; Charles J Hinds; Emma McBryde
Low serum mannose-binding lectin level increases the risk of death due to pneumococcal infection.
Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2008;47(4):510-6.
2008: Andrew Johnston; S Arnadottir; Johann Gudjonsson; A Aphale; A A Sigmarsdottir; S I Gunnarsson; J T Steinsson; James T Elder; Helgi Valdimarsson
Obesity in psoriasis: leptin and resistin as mediators of cutaneous inflammation.
The British journal of dermatology 2008;159(2):342-50.
2008: Peter Bang; Inga Laursen; Klaus Thornberg; Jens Schierbeck; Bjarne Nielsen; Helgi Valdimarsson; Claus Koch; Michael Christiansen
The pharmacokinetic profile of plasma-derived mannan-binding lectin in healthy adult volunteers and patients with Staphylococcus aureus septicaemia.
Scandinavian journal of infectious diseases 2008;40(1):44-8.
2007: Helgi Valdimarsson
The genetic basis of psoriasis.
Clinics in dermatology 2007;25(6):563-7.
2007: Thorvardur Jon Love; Bjorn Gudbjornsson; Johann Gudjonsson; Helgi Valdimarsson
Psoriatic arthritis in Reykjavik, Iceland: prevalence, demographics, and disease course.
The Journal of rheumatology 2007;34(10):2082-8.
2007: Saedis Saevarsdottir; Kristjan Steinsson; Gerdur Grondal; Helgi Valdimarsson
Patients with rheumatoid arthritis have higher levels of mannan-binding lectin than their first-degree relatives and unrelated controls.
The Journal of rheumatology 2007;34(8):1692-5.
2007: Johann Gudjonsson; Andrew Johnston; Melissa Combs Dyson; Helgi Valdimarsson; James T Elder
Mouse models of psoriasis.
The Journal of investigative dermatology 2007;127(6):1292-308.
2007: Saedis Saevarsdottir; Kristjan Steinsson; B R Ludviksson; Gerdur Grondal; Helgi Valdimarsson
Mannan-binding lectin may facilitate the clearance of circulating immune complexes--implications from a study on C2-deficient individuals.
Clinical and experimental immunology 2007;148(2):248-53.
2006: Saedis Saevarsdottir; Helga Kristjansdottir; Gerdur Grondal; Thora Vikingsdottir; Kristjan Steinsson; Helgi Valdimarsson
Mannan-binding lectin and complement C4A in Icelandic multicase families with systemic lupus erythematosus.
Annals of the rheumatic diseases 2006;65(11):1462-7.
2006: VF Manfredsdottir; Thora Vikingsdottir; T Jonsson; Arni J Geirsson; Olafur Kjartansson; M Heimisdottir; S L Sigurdardottir; Helgi Valdimarsson; A Vikingsson
The effects of tobacco smoking and rheumatoid factor seropositivity on disease activity and joint damage in early rheumatoid arthritis.
Rheumatology (Oxford, England) 2006;45(6):734-40.
2006: Johann Gudjonsson; Ari Karason; E Hjaltey Runarsdottir; Arna A Antonsdottir; Valdimar B Hauksson; Hjörtur H Jónsson; Jeffrey R Gulcher; Kari Stefansson; Helgi Valdimarsson
Distinct clinical differences between HLA-Cw*0602 positive and negative psoriasis patients--an analysis of 1019 HLA-C- and HLA-B-typed patients.
The Journal of investigative dermatology 2006;126(4):740-5.
2005: Hekla Sigmundsdottir; Andrew Johnston; Johann Gudjonsson; Helgi Valdimarsson
Narrowband-UVB irradiation decreases the production of pro-inflammatory cytokines by stimulated T cells.
Archives of dermatological research 2005;297(1):39-42.
2005: Ari Karason; Johann Gudjonsson; Hjörtur H Jónsson; Valdimar B Hauksson; E Hjaltey Runarsdottir; Kari Stefansson; Helgi Valdimarsson; Jeffrey R Gulcher
Genetics of psoriasis in Iceland: evidence for linkage of subphenotypes to distinct Loci.
The Journal of investigative dermatology 2005;124(6):1177-85.
2005: H K Thórarinsdóttir; B R Lúdvíksson; Th Víkingsdóttir; M O Leópoldsdóttir; B Ardal; Thorbjörn Jónsson; Helgi Valdimarsson; Guðmundur Jóhann Arason
Childhood levels of immunoglobulins and mannan-binding lectin in relation to infections and allergy.
Scandinavian journal of immunology 2005;61(5):466-74.
2005: Andrew Johnston; Johann Gudjonsson; Hekla Sigmundsdottir; Björn Runar Ludviksson; Helgi Valdimarsson
The anti-inflammatory action of methotrexate is not mediated by lymphocyte apoptosis, but by the suppression of activation and adhesion molecules.
Clinical immunology (Orlando, Fla.) 2005;114(2):154-63.
2005: Saedis Saevarsdottir; Oskar Orn Oskarsson; Thor Aspelund; Gudny Eiriksdottir; Thora Vikingsdottir; Vilmundur Gudnason; Helgi Valdimarsson
Mannan binding lectin as an adjunct to risk assessment for myocardial infarction in individuals with enhanced risk.
The Journal of experimental medicine 2005;201(1):117-25.
2005: B R Lúdvíksson; Guðmundur Jóhann Arason; O Thorarensen; B Ardal; Helgi Valdimarsson
Allergic diseases and asthma in relation to serum immunoglobulins and salivary immunoglobulin A in pre-school children: a follow-up community-based study.
Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology 2005;35(1):64-9.
2004: Andrew Johnston; Johann Gudjonsson; Hekla Sigmundsdottir; T J Love; Helgi Valdimarsson
Peripheral blood T cell responses to keratin peptides that share sequences with streptococcal M proteins are largely restricted to skin-homing CD8(+) T cells.
Clinical and experimental immunology 2004;138(1):83-93.
2004: Helgi Valdimarsson; Ari Karason; Johann Gudjonsson
Psoriasis: a complex clinical and genetic disorder.
Current rheumatology reports 2004;6(4):314-6.
2004: Saedis Saevarsdottir; Thora Vikingsdottir; Helgi Valdimarsson
The potential role of mannan-binding lectin in the clearance of self-components including immune complexes.
Scandinavian journal of immunology 2004;60(1-2):23-9.
2004: Hekla Sigmundsdottir; Andrew Johnston; Johann Gudjonsson; Bolli Bjarnason; Helgi Valdimarsson
Methotrexate markedly reduces the expression of vascular E-selectin, cutaneous lymphocyte-associated antigen and the numbers of mononuclear leucocytes in psoriatic skin.
Experimental dermatology 2004;13(7):426-34.
2004: Guðmundur Jóhann Arason; Kristjan Steinsson; Ragnhildur Kolka; Th Víkingsdóttir; M S D'Ambrogio; Helgi Valdimarsson
Patients with systemic lupus erythematosus are deficient in complement-dependent prevention of immune precipitation.
Rheumatology (Oxford, England) 2004;43(6):783-9.
2004: Hekla Sigmundsdóttir; Andrew Johnston; Johann Gudjonsson; Helgi Valdimarsson
Differential effects of interleukin 12 and interleukin 10 on superantigen-induced expression of cutaneous lymphocyte-associated antigen (CLA) and alphaEbeta7 integrin (CD103) by CD8+ T cells.
Clinical immunology (Orlando, Fla.) 2004;111(1):119-25.
2004: Helgi Valdimarsson; Thora Vikingsdottir; Peter Bang; Saedis Saevarsdottir; Johann Gudjonsson; O Oskarsson; Michael Christiansen; Lene Blou; Inga Laursen; Claus Koch
Human plasma-derived mannose-binding lectin: a phase I safety and pharmacokinetic study.
Scandinavian journal of immunology 2004;59(1):97-102.
2004: Johann Gudjonsson; Andrew Johnston; Hekla Sigmundsdottir; Helgi Valdimarsson
Immunopathogenic mechanisms in psoriasis.
Clinical and experimental immunology 2004;135(1):1-8.
2003: Johann Gudjonsson; A M Thorarinsson; Bardur Sigurgeirsson; Karl G Kristinsson; Helgi Valdimarsson
Streptococcal throat infections and exacerbation of chronic plaque psoriasis: a prospective study.
The British journal of dermatology 2003;149(3):530-4.
2003: Hekla Sigmundsdóttir; Johann Gudjonsson; Helgi Valdimarsson
Interleukin-12 alone can not enhance the expression of the cutaneous lymphocyte associated antigen (CLA) by superantigen-stimulated T lymphocytes.
Clinical and experimental immunology 2003;132(3):430-5.
2003: Hekla Sigmundsdottir; Johann Gudjonsson; Helgi Valdimarsson
The effects of ultraviolet B treatment on the expression of adhesion molecules by circulating T lymphocytes in psoriasis.
The British journal of dermatology 2003;148(5):996-1000.
2003: Johann Gudjonsson; Ari Karason; Arna A Antonsdottir; E Hjaltey Runarsdottir; Valdimar B Hauksson; Ruchi Upmanyu; Jeffrey R Gulcher; Kari Stefansson; Helgi Valdimarsson
Psoriasis patients who are homozygous for the HLA-Cw*0602 allele have a 2.5-fold increased risk of developing psoriasis compared with Cw6 heterozygotes.
The British journal of dermatology 2003;148(2):233-5.
2003: Ari Karason; Johann Gudjonsson; Ruchi Upmanyu; Arna A Antonsdottir; Valdimar B Hauksson; E Hjaltey Runasdottir; Hjortur H Jonsson; Daniel F Gudbjartsson; Michael L Frigge; Augustine Kong; Kari Stefansson; Helgi Valdimarsson; Jeffrey R Gulcher
A susceptibility gene for psoriatic arthritis maps to chromosome 16q: evidence for imprinting.
American journal of human genetics 2003;72(1):125-31.
2002: S Jonsson; Gestur Vidarsson; Helgi Valdimarsson; G Schiffman; Rachel Schneerson; Ingileif Jonsdottir
Vaccination of COPD patients with a pneumococcus type 6B tetanus toxoid conjugate vaccine.
The European respiratory journal : official journal of the European Society for Clinical Respiratory Physiology 2002;20(4):813-8.
2002: Guðmundur Jóhann Arason; Arni J Geirsson; Ragnhildur Kolka; Th Víkingsdóttir; Helgi Valdimarsson
Deficiency of complement-dependent prevention of immune precipitation in systemic sclerosis.
Annals of the rheumatic diseases 2002;61(3):257-60.
2002: Johann Gudjonsson; Ari Kárason; Arna A Antonsdóttir; E Hjaltey Rúnarsdóttir; Jeffrey R Gulcher; Kári Stefánsson; Helgi Valdimarsson
HLA-Cw6-positive and HLA-Cw6-negative patients with Psoriasis vulgaris have distinct clinical features.
The Journal of investigative dermatology 2002;118(2):362-5.
2002: Sturla Arinbjarnarson; Helgi Valdimarsson
Generation of heterohybridomas secreting human immunoglobulins; pokeweed mitogen prestimulation is highly effective but phytohemagglutinin drives most B cells into apoptosis.
Journal of immunological methods 2002;259(1-2):139-48.
2001: Hekla Sigmundsdóttir; Johann Gudjonsson; I Jónsdóttir; B R Lúdvíksson; Helgi Valdimarsson
The frequency of CLA+ CD8+ T cells in the blood of psoriasis patients correlates closely with the severity of their disease.
Clinical and experimental immunology 2001;126(2):365-9.
2001: Saedis Saevarsdottir; Thora Vikingsdottir; A Vikingsson; VF Manfredsdottir; Arni J Geirsson; Helgi Valdimarsson
Low mannose binding lectin predicts poor prognosis in patients with early rheumatoid arthritis. A prospective study.
The Journal of rheumatology 2001;28(4):728-34.
2000: B Masdottir; Thorbjörn Jónsson; VF Manfredsdottir; A Víkingsson; A Brekkan; Helgi Valdimarsson
Smoking, rheumatoid factor isotypes and severity of rheumatoid arthritis.
Rheumatology (Oxford, England) 2000;39(11):1202-5.
2000: A Vikingsson; Helgi Valdimarsson
Mannose-binding lectin deficiency and infections in homozygous and heterozygous patients with systemic lupus erythematosus: comment on the article by Garred et al.
Arthritis and rheumatism 2000;43(7):1657-8.
2000: H D Halldórsdóttir; Thorbjörn Jónsson; J Thorsteinsson; Helgi Valdimarsson
A prospective study on the incidence of rheumatoid arthritis among people with persistent increase of rheumatoid factor.
Annals of the rheumatic diseases 2000;59(2):149-51.
2000: Thorbjörn Jónsson; J Thorsteinsson; Helgi Valdimarsson
Elevation of only one rheumatoid factor isotype is not associated with increased prevalence of rheumatoid arthritis--a population based study.
Scandinavian journal of rheumatology 2000;29(3):190-1.
1999: A S Gudmundsdottir; Hekla Sigmundsdottir; Bardur Sigurgeirsson; M F Good; Helgi Valdimarsson; Ingileif Jonsdottir
Is an epitope on keratin 17 a major target for autoreactive T lymphocytes in psoriasis?
Clinical and experimental immunology 1999;117(3):580-6.
1999: Guðmundur Jóhann Arason; M S D'Ambrogio; Th Víkingsdóttir; A Sigfússon; Helgi Valdimarsson
Enzyme immunoassays for measuring complement-dependent prevention of immune precipitation (PIP) and solubilization of preformed antigen-antibody complexes (SOL).
Journal of immunological methods 1999;223(1):37-46.
1998: Thorbjörn Jónsson; J Thorsteinsson; Helgi Valdimarsson
Does smoking stimulate rheumatoid factor production in non-rheumatic individuals?
APMIS : acta pathologica, microbiologica, et immunologica Scandinavica 1998;106(10):970-4.
1998: Helgi Valdimarsson; M Stefansson; Thora Vikingsdottir; Guðmundur Jóhann Arason; Claus Koch; S Thiel; J C Jensenius
Reconstitution of opsonizing activity by infusion of mannan-binding lectin (MBL) to MBL-deficient humans.
Scandinavian journal of immunology 1998;48(2):116-23.
1998: Gestur Vidarsson; Sigurveig T Sigurdardottir; Thorolfur Gudnason; Sveinn Kjartansson; Karl G Kristinsson; Gunnhildur Ingolfsdottir; S Jonsson; Helgi Valdimarsson; G Schiffman; Rachel Schneerson; Ingileif Jonsdottir
Isotypes and opsonophagocytosis of pneumococcus type 6B antibodies elicited in infants and adults by an experimental pneumococcus type 6B-tetanus toxoid vaccine.
Infection and immunity 1998;66(6):2866-70.
1998: KH Traustadóttir; B O Rafnar; Kristjan Steinsson; Helgi Valdimarsson; Kristjan Erlendsson
Participation of factor B in residual immune complex red cell binding activity observed in serum from a C2-deficient systemic lupus erythematosus patient may delay the appearance of clinical symptoms.
Arthritis and rheumatism 1998;41(3):427-34.
1998: B O Rafnar; KH Traustadóttir; A Sigfússon; Guðmundur Jóhann Arason; Helgi Valdimarsson; Kristjan Erlendsson
An enzyme based assay for the measurement of complement mediated binding of immune complexes to red blood cells.
Journal of immunological methods 1998;211(1-2):171-81.
1998: Thorbjörn Jónsson; Kristjan Steinsson; Hjörtur H Jónsson; Arni J Geirsson; J Thorsteinsson; Helgi Valdimarsson
Combined elevation of IgM and IgA rheumatoid factor has high diagnostic specificity for rheumatoid arthritis.
Rheumatology international 1998;18(3):119-22.
1998: Thorbjörn Jónsson; Helgi Valdimarsson
What about IgA rheumatoid factor in rheumatoid arthritis?
Annals of the rheumatic diseases 1998;57(1):63-4.
1997: Sigurveig T Sigurdardottir; Gestur Vidarsson; Thorolfur Gudnason; Sveinn Kjartansson; Karl G Kristinsson; S Jonsson; Helgi Valdimarsson; G Schiffman; Rachel Schneerson; Ingileif Jonsdottir
Immune responses of infants vaccinated with serotype 6B pneumococcal polysaccharide conjugated with tetanus toxoid.
The Pediatric infectious disease journal 1997;16(7):667-74.
1997: Hekla Sigmundsdottir; Bardur Sigurgeirsson; M Troye-Blomberg; M F Good; Helgi Valdimarsson; Ingileif Jonsdottir
Circulating T cells of patients with active psoriasis respond to streptococcal M-peptides sharing sequences with human epidermal keratins.
Scandinavian journal of immunology 1997;45(6):688-97.
1997: Sturla Arinbjarnarson; T Jonsson; Kristjan Steinsson; A Sigfusson; H Jonsson; Arni J Geirsson; J Thorsteinsson; Helgi Valdimarsson
IgA rheumatoid factor correlates with changes in B and T lymphocyte subsets and disease manifestations in rheumatoid arthritis.
The Journal of rheumatology 1997;24(2):269-74.
1997: Helgi Valdimarsson; Hekla Sigmundsdóttir; I Jónsdóttir
Is psoriasis induced by streptococcal superantigens and maintained by M-protein-specific T cells that cross-react with keratin?
Clinical and experimental immunology 1997;107 Suppl 1():21-4.
1996: Helgi Valdimarsson; Thorbjörn Jónsson
Predictive value of rheumatoid factor isotypes for radiological progression in patients with rheumatoid arthritis.
Scandinavian journal of rheumatology 1996;25(3):189-90.
1995: Thorbjörn Jónsson; H Thorsteinsson; Sturla Arinbjarnarson; J Thorsteinsson; Helgi Valdimarsson
Clinical implications of IgA rheumatoid factor subclasses.
Annals of the rheumatic diseases 1995;54(7):578-81.
1995: Thorbjörn Jónsson; Helgi Valdimarsson
Prognostic value of rheumatoid factors in rheumatoid arthritis.
The Journal of rheumatology 1995;22(3):570-1.
1995: Helgi Valdimarsson; B S Baker; I Jónsdóttir; A Powles; L Fry
Psoriasis: a T-cell-mediated autoimmune disease induced by streptococcal superantigens?
Immunology today 1995;16(3):145-9.
1995: M Sökjer; Thorbjörn Jónsson; S Bödvarsson; I Jónsdóttir; Helgi Valdimarsson
Selective increase of IgA rheumatoid factor in patients with gluten sensitivity.
Acta dermato-venereologica 1995;75(2):130-2.
1995: Thorbjörn Jónsson; Sturla Arinbjarnarson; J Thorsteinsson; Kristjan Steinsson; A J Geirsson; Hjörtur H Jónsson; Helgi Valdimarsson
Raised IgA rheumatoid factor (RF) but not IgM RF or IgG RF is associated with extra-articular manifestations in rheumatoid arthritis.
Scandinavian journal of rheumatology 1995;24(6):372-5.
1994: G Vitharsson; I Jónsdóttir; S Jónsson; Helgi Valdimarsson
Opsonization and antibodies to capsular and cell wall polysaccharides of Streptococcus pneumoniae.
The Journal of infectious diseases 1994;170(3):592-9.
1994: T H Eiríksson; Bardur Sigurgeirsson; B Ardal; A Sigfússon; Helgi Valdimarsson
Cord blood IgE levels are influenced by gestational age but do not predict allergic manifestations in infants.
Pediatric allergy and immunology : official publication of the European Society of Pediatric Allergy and Immunology 1994;5(1):5-10.
1993: S Bödvarsson; I Jónsdóttir; J Freysdóttir; J N Leonard; L Fry; Helgi Valdimarsson
Dermatitis herpetiformis--an autoimmune disease due to cross-reaction between dietary glutenin and dermal elastin?
Scandinavian journal of immunology 1993;38(6):546-50.
1993: Kevin A Davies; Kristjan Erlendsson; H L Beynon; A Michael Peters; Kristjan Steinsson; Helgi Valdimarsson; Mark J Walport
Splenic uptake of immune complexes in man is complement-dependent.
Journal of immunology (Baltimore, Md. : 1950) 1993;151(7):3866-73.
1993: Kristjan Erlendsson; K Traustadóttir; J Freysdóttir; Kristjan Steinsson; I Jónsdóttir; Helgi Valdimarsson
Reciprocal changes in complement activity and immune-complex levels during plasma infusion in a C2-deficient SLE patient.
Lupus 1993;2(3):161-5.
1993: Thorbjörn Jónsson; Helgi Valdimarsson
Is measurement of rheumatoid factor isotypes clinically useful?
Annals of the rheumatic diseases 1993;52(2):161-4.
1992: Thorbjörn Jónsson; J Thorsteinsson; A Kolbeinsson; E Jónasdóttir; Nikulás Sigfússon; Helgi Valdimarsson
Population study of the importance of rheumatoid factor isotypes in adults.
Annals of the rheumatic diseases 1992;51(7):863-8.
1992: Thorbjörn Jónsson; J Thorsteinsson; Helgi Valdimarsson
Rheumatoid factor isotypes and cancer prognosis.
Cancer 1992;69(8):2160-5.
1992: J A Arnason; H Gudjónsson; J Freysdóttir; I Jónsdóttir; Helgi Valdimarsson
Do adults with high gliadin antibody concentrations have subclinical gluten intolerance?
Gut 1992;33(2):194-7.
1992: Thorbjörn Jónsson; Helgi Valdimarsson
Clinical significance of rheumatoid factor isotypes in seropositive arthritis.
Rheumatology international 1992;12(3):111-3.
1990: Kristjan Steinsson; I Jónsdóttir; Helgi Valdimarsson
Cyclosporin A in psoriatic arthritis: an open study.
Annals of the rheumatic diseases 1990;49(8):603-6.
1990: E Bardardottir; S Jonsson; Ingileif Jonsdottir; A Sigfusson; Helgi Valdimarsson
IgG subclass response and opsonization of Streptococcus pneumoniae after vaccination of healthy adults.
The Journal of infectious diseases 1990;162(2):482-8.
1989: Kristjan Steinsson; Kristjan Erlendsson; Helgi Valdimarsson
Successful plasma infusion treatment of a patient with C2 deficiency and systemic lupus erythematosus: clinical experience over forty-five months.
Arthritis and rheumatism 1989;32(7):906-13.
1987: Helgi Valdimarsson; J A Arnason; Thorbjörn Jónsson
Bone erosions in rheumatic diseases.
Lancet 1987;2(8563):854.
1987: J A Arnason; Thorbjörn Jónsson; A Brekkan; K Sigurjónsson; Helgi Valdimarsson
Relation between bone erosions and rheumatoid factor isotypes.
Annals of the rheumatic diseases 1987;46(5):380-4.
1985: I Teitsson; J Thorsteinsson; A Arnason; Helgi Valdimarsson
Rheumatic diseases in an Icelandic family. Clinical and immunological survey.
Scandinavian journal of rheumatology 1985;14(2):109-18.
1984: R H Withrington; I Teitsson; Helgi Valdimarsson; M H Seifert
Prospective study of early rheumatoid arthritis. II. Association of rheumatoid factor isotypes with fluctuations in disease activity.
Annals of the rheumatic diseases 1984;43(5):679-85.
1984: I Teitsson; R H Withrington; M H Seifert; Helgi Valdimarsson
Prospective study of early rheumatoid arthritis. I. Prognostic value of IgA rheumatoid factor.
Annals of the rheumatic diseases 1984;43(5):673-8.
1984: I Teitsson; Helgi Valdimarsson
Use of monoclonal antibodies and F(ab')2 enzyme conjugates in ELISA for IgM, IgA and IgG rheumatoid factors.
Journal of immunological methods 1984;71(2):149-61.
1984: R H Withrington; I Teitsson; M H Seifert; Helgi Valdimarsson
Felty's syndrome associated with high levels of IgA rheumatoid factor.
Annals of the rheumatic diseases 1984;43(3):505-7.