Ricardo Diaz | Copenhagen Business School, CBS (original) (raw)

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Papers by Ricardo Diaz

Research paper thumbnail of Distribution of HIV1 subtypes seen in an AIDS clinic in Sao Paulo City, Brazil

Research paper thumbnail of Risk Factors for Incident HIV Infection Among Anonymous HIV Testing Site Clients in Santos, Brazil: 1996???1999

Jaids-journal of Acquired Immune Deficiency Syndromes, 2003

To determine temporal trends in HIV infection and risk factors among persons seeking anonymous HI... more To determine temporal trends in HIV infection and risk factors among persons seeking anonymous HIV testing in Santos, Brazil. Data and sera from persons testing for HIV from 1996 to 1999 were used. Exposures were abstracted from HIV testing risk assessments. Stored HIV-positive sera were tested to identify recently acquired HIV infection using a serologic testing algorithm for detecting recent HIV seroconversion (STARHS). Independent associations between exposures and recently acquired HIV infection were determined using multivariate analyses. Overall, estimated HIV incidence was 2.0% (95% CI: 1.1-3.5) for the 4-year period: 1.2% (95% CI: 0.5-2.6) in women and 2.7% (95% CI: 1.3-5.0) in men. Incidence increased among women but remained stable among men. Exposures independently associated with incident infection included a history of sex work (OR= 5.4, 95% CI: 1.5-18.7), concurrent syphilis infection (OR =4.1, 95% CI: 1.4-11.9), anal sex (OR = 3.0, 95% CI: 1.3-7.1), and having an HIV-positive sexual partner (OR= 1.4, 95% CI: 1.1-1.9). This study further demonstrates the public health utility of using the STARHS for the assessment of emerging trends in the HIV epidemic. Results from this study will help to target appropriate prevention strategies directed toward at-risk populations in Santos.

Research paper thumbnail of Strong HIV1Specific T Cell Responses in HIV1Exposed Uninfected Infants and Neonates Revealed after Regulatory T Cell Removal

Research paper thumbnail of A specific subtype C of human immunodeficiency virus type 1 circulates in Brazil

Research paper thumbnail of Analysis of Full-Length Human Immunodeficiency Virus Type 1 Genome Reveals a Variable Spectrum of Subtypes B and F Recombinants in Sao Paulo, Brazil

Aids Research and Human Retroviruses, 2005

Research paper thumbnail of Dual Human Immunodeficiency Virus Type 1 Infection and Recombination in a Dually Exposed Transfusion Recipient

Research paper thumbnail of Use of a new ???less-sensitive enzyme immunoassay??? testing strategy to identify recently infected persons in a Brazilian prison: estimation of incidence and epidemiological tracing

Research paper thumbnail of Host-Specific Driving Force in Human Immunodeficiency Virus Type 1 Evolution In Vivo

Research paper thumbnail of Divergence of HIV1 quasispecies in an epidemiologic cluster

Research paper thumbnail of Use of the sensitive/less-sensitive (detuned) EIA strategy for targeting genetic analysis of HIV1 to recently infected blood donors

Research paper thumbnail of Flow cytometric determination of lipid content in a marine dinoflagellate, Crypthecodinium cohnii

Journal of Applied Phycology, 2003

Since flow cytometry allows rapid,simultaneous and quantitative measurementsrelated to cell morph... more Since flow cytometry allows rapid,simultaneous and quantitative measurementsrelated to cell morphology andphysiologicy, the lipid-specificfluorescent dye, Nile Red, was employed forthe in vivo lipid quantification of Crypthecodinium cohnii, a heterotrophicmarine dinoflagellate rich inpolyunsaturated long chain fatty acids. Thefluorescence signal was linearly correlatedwith the neutral and polar lipid content asdetermined by gravimetric techniques. Asignificant correlation of NR signal wasalso observed between the polar to neutrallipid ratio and docohexaenoic acid percell. The results demonstrate a method forrapid lipid quantification that can be usedin the selection, isolation and culturecontrol of C. cohnii clones with highlipid and DHA content.

Research paper thumbnail of THE EHRHART POLYNOMIAL OF A LATTICE n-SIMPLEX

Research paper thumbnail of The Frobenius Problem, Rational Polytopes, and Fourier-Dedekind Sums1

Research paper thumbnail of The Frobenius Problem, Rational Polytopes, and Fourier–Dedekind Sums

Journal of Number Theory, 2002

Research paper thumbnail of A hybrid genetic algorithm for optimal reactive power planning based upon successive linear programming

IEEE Transactions on Power Systems, 1999

Research paper thumbnail of Distribution of HIV1 subtypes seen in an AIDS clinic in Sao Paulo City, Brazil

Research paper thumbnail of Risk Factors for Incident HIV Infection Among Anonymous HIV Testing Site Clients in Santos, Brazil: 1996???1999

Jaids-journal of Acquired Immune Deficiency Syndromes, 2003

To determine temporal trends in HIV infection and risk factors among persons seeking anonymous HI... more To determine temporal trends in HIV infection and risk factors among persons seeking anonymous HIV testing in Santos, Brazil. Data and sera from persons testing for HIV from 1996 to 1999 were used. Exposures were abstracted from HIV testing risk assessments. Stored HIV-positive sera were tested to identify recently acquired HIV infection using a serologic testing algorithm for detecting recent HIV seroconversion (STARHS). Independent associations between exposures and recently acquired HIV infection were determined using multivariate analyses. Overall, estimated HIV incidence was 2.0% (95% CI: 1.1-3.5) for the 4-year period: 1.2% (95% CI: 0.5-2.6) in women and 2.7% (95% CI: 1.3-5.0) in men. Incidence increased among women but remained stable among men. Exposures independently associated with incident infection included a history of sex work (OR= 5.4, 95% CI: 1.5-18.7), concurrent syphilis infection (OR =4.1, 95% CI: 1.4-11.9), anal sex (OR = 3.0, 95% CI: 1.3-7.1), and having an HIV-positive sexual partner (OR= 1.4, 95% CI: 1.1-1.9). This study further demonstrates the public health utility of using the STARHS for the assessment of emerging trends in the HIV epidemic. Results from this study will help to target appropriate prevention strategies directed toward at-risk populations in Santos.

Research paper thumbnail of Strong HIV1Specific T Cell Responses in HIV1Exposed Uninfected Infants and Neonates Revealed after Regulatory T Cell Removal

Research paper thumbnail of A specific subtype C of human immunodeficiency virus type 1 circulates in Brazil

Research paper thumbnail of Analysis of Full-Length Human Immunodeficiency Virus Type 1 Genome Reveals a Variable Spectrum of Subtypes B and F Recombinants in Sao Paulo, Brazil

Aids Research and Human Retroviruses, 2005

Research paper thumbnail of Dual Human Immunodeficiency Virus Type 1 Infection and Recombination in a Dually Exposed Transfusion Recipient

Research paper thumbnail of Use of a new ???less-sensitive enzyme immunoassay??? testing strategy to identify recently infected persons in a Brazilian prison: estimation of incidence and epidemiological tracing

Research paper thumbnail of Host-Specific Driving Force in Human Immunodeficiency Virus Type 1 Evolution In Vivo

Research paper thumbnail of Divergence of HIV1 quasispecies in an epidemiologic cluster

Research paper thumbnail of Use of the sensitive/less-sensitive (detuned) EIA strategy for targeting genetic analysis of HIV1 to recently infected blood donors

Research paper thumbnail of Flow cytometric determination of lipid content in a marine dinoflagellate, Crypthecodinium cohnii

Journal of Applied Phycology, 2003

Since flow cytometry allows rapid,simultaneous and quantitative measurementsrelated to cell morph... more Since flow cytometry allows rapid,simultaneous and quantitative measurementsrelated to cell morphology andphysiologicy, the lipid-specificfluorescent dye, Nile Red, was employed forthe in vivo lipid quantification of Crypthecodinium cohnii, a heterotrophicmarine dinoflagellate rich inpolyunsaturated long chain fatty acids. Thefluorescence signal was linearly correlatedwith the neutral and polar lipid content asdetermined by gravimetric techniques. Asignificant correlation of NR signal wasalso observed between the polar to neutrallipid ratio and docohexaenoic acid percell. The results demonstrate a method forrapid lipid quantification that can be usedin the selection, isolation and culturecontrol of C. cohnii clones with highlipid and DHA content.

Research paper thumbnail of THE EHRHART POLYNOMIAL OF A LATTICE n-SIMPLEX

Research paper thumbnail of The Frobenius Problem, Rational Polytopes, and Fourier-Dedekind Sums1

Research paper thumbnail of The Frobenius Problem, Rational Polytopes, and Fourier–Dedekind Sums

Journal of Number Theory, 2002

Research paper thumbnail of A hybrid genetic algorithm for optimal reactive power planning based upon successive linear programming

IEEE Transactions on Power Systems, 1999

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