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Dive into the research topics where Gregory Phillips is active.

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Featured researches published by Gregory Phillips.


Journal of Acquired Immune Deficiency Syndromes | 2010

Characteristics associated with retention among African American and Latino adolescent HIV-positive men: results from the outreach, care, and prevention to engage HIV-seropositive young MSM of color special project of national significance initiative.

Manya Magnus; Karen Jones; Gregory Phillips; Diane Binson; Lisa B. Hightow-Weidman; Candia Richards-Clarke; Amy Rock Wohl; Angulique Y. Outlaw; Thomas P. Giordano; Alvan Quamina; Will Cobbs; Sheldon D. Fields; Melinda Tinsley; Adan Cajina; Julia Hidalgo

Background:Surveillance points to an urgent public health need for HIV prevention, access, and retention among young men of color who have sex with men (YMSM). The purpose of this multisite study was to evaluate the association between organizational- and individual-level characteristics and retention in HIV care among HIV-positive YMSM of color. Methods:Data were collected quarterly via face-to-face interviews and chart abstraction between June 2006 and September 2008. Participants were aged 16-24 years, enrolled at 1 of 8 participating youth-specific demonstration sites, and engaged or reengaged in HIV care within the last 30 days. Generalized estimating equations were used to examine factors associated with missing research and care visits. Stata v.9.0se was used for analysis. Results:Of 224 participants, the majority were African American (72.7%), 19-22 years old (66.5%), had graduated high school or equivalent (71.8%), identified as gay or homosexual (80.8%), and disclosed having had sex with a man before HIV diagnosis (98.2%). Over the first 2¼ years of the study, only 11.4% of visits were missed without explanation or patient contact. Characteristics associated with retention included being <21 years old, a history of depression, receipt of program services, and feeling respected at clinic; those associated with poorer retention included having a CD4 count <200 at baseline and being Latino. Conclusions:Special Projects of National Significance programs were able to achieve a high level of retention over time, and individual and program characteristics were associated with retention. Latino YMSM, those not receiving services, and those not perceiving respect at the clinic were at increased risk of falling out of care. Retention is essential to providing HIV+ adolescents with treatment, including reducing antiretroviral resistance development. Innovative programs that address the needs of the YMSM of color population may result in improved retention.


Aids Patient Care and Stds | 2011

Age of MSM Sexual Debut and Risk Factors: Results from a Multisite Study of Racial/Ethnic Minority YMSM Living with HIV

Angulique Y. Outlaw; Gregory Phillips; Lisa B. Hightow-Weidman; Sheldon D. Fields; Julia Hidalgo; Bonnie L. Halpern-Felsher; Monique Green-Jones

The average reported age of sexual debut for youth in the United States is 14.4 years, with approximately 7% reporting their sexual debut prior to age 13. While the research literature on sexual debut for youth addresses gender and ethnic differences (with males and African-American youth experiencing earlier sexual debut), there is limited data regarding factors associated with sexual debut for young men who have sex with men (YMSM). Early sexual debut poses potential health risks, such as contracting HIV with an increased risk of unprotected intercourse. Given current high HIV infection rates for racial/ethnic minority YMSM, learning more about their sexual debuts and associated risk factors of this population is of great importance. This study investigated risk behaviors and emotional distress, and their association with MSM sexual debut for a multisite cohort of racial/ethnic minority YMSM living with HIV. We hypothesized that a MSM sexual debut younger than age 16 would be associated with engagement in more high-risk sexual behaviors (unprotected sex and exchange sex), substance use, and emotional distress than a MSM sexual debut at age 16 or older. Results indicated that participants having a MSM sexual debut before the age of 16 reported more exchange sex; drug use (specifically marijuana); emotional/psychological problems related to substance use; and a history of suicide attempts, compared to participants with later MSM sexual debuts. Comprehensive interventions that are racially/ethnically sensitive, inquire about initial sexual experiences, and focus on sexual health and healthy relationships are needed to improve health outcomes for this population.


Aids and Behavior | 2014

Understanding structural barriers to accessing HIV testing and prevention services among black men who have sex with men (BMSM) in the United States

Matthew E. Levy; Leo Wilton; Gregory Phillips; Sara Nelson Glick; Irene Kuo; Russell A. Brewer; Ayana Elliott; Christopher Chauncey Watson; Manya Magnus

Structural-level factors have contributed to the substantial disproportionate rates of HIV among Black men who have sex with men (BMSM) in the United States. Despite insufficient HIV testing patterns, however, there is a void in research investigating the relationship between structural factors and access to HIV testing and prevention services among BMSM. Building on previous scholarly work and incorporating a dynamic social systems conceptual framework, we conducted a comprehensive review of the literature on structural barriers to HIV testing and prevention services among BMSM across four domains: healthcare, stigma and discrimination, incarceration, and poverty. We found that BMSM experience inadequate access to culturally competent services, stigma and discrimination that impede access to services, a deficiency of services in correctional institutions, and limited services in areas where BMSM live. Structural interventions that eliminate barriers to HIV testing and prevention services and provide BMSM with core skills to navigate complex systems are needed.


Aids Patient Care and Stds | 2010

Elevated HIV Prevalence Despite Lower Rates of Sexual Risk Behaviors Among Black Men in the District of Columbia Who Have Sex with Men

Manya Magnus; Irene Kuo; Gregory Phillips; Katharine D. Shelley; Anthony Rawls; Luz Montanez; James Peterson; Shannon Hader; Alan E. Greenberg

The District of Columbia (DC) has among the highest HIV/AIDS rates in the United States, with 3.2% of the population and 7.1% of black men living with HIV/AIDS. The purpose of this study was to examine HIV risk behaviors in a community-based sample of men who have sex with men (MSM) in DC. Data were from the National HIV Behavioral Surveillance system. MSM who were 18 years were recruited via venue-based sampling between July 2008 and December 2008. Behavioral surveys and rapid oral HIV screening with OraQuick ADVANCE ½ (OraSure Technologies, Inc., Bethlehem, PA) with Western blot confirmation on positives were collected. Factors associated with HIV positivity and unprotected anal intercourse were identified. Of 500 MSM, 35.6% were black. Of all men, 14.1% were confirmed HIV positive; 41.8% of these were newly identified HIV positive. Black men (26.0%) were more likely to be HIV positive than white (7.9%) or Latino/Asian/other (6.5%) men (p<0.001). Black men had fewer male sex partners than non-black, fewer had ever engaged in intentional unprotected anal sex, and more used condoms at last anal sex. Black men were less likely to have health insurance, have been tested for HIV, and disclose MSM status to health care providers. Despite significantly higher HIV/AIDS rates, black MSM in DC reported fewer sexual risks than non-black. These findings suggest that among black MSM, the primary risk of HIV infection results from nontraditional sexual risk factors, and may include barriers to disclosing MSM status and HIV testing. There remains a critical need for more information regarding reasons for elevated HIV among black MSM in order to inform prevention programming.


Aids Patient Care and Stds | 2011

Early linkage and retention in care: Findings from the outreach, linkage, and retention in care initiative among young men of color who have sex with men

Lisa B. Hightow-Weidman; Karen Jones; Amy Rock Wohl; Donna Futterman; Angulique Y. Outlaw; Gregory Phillips; Julia Hidalgo; Thomas P. Giordano

Early linkage and retention in HIV clinical care is essential for optimal disease management, promotion of health, and receipt of secondary prevention messages to decrease onward transmission of HIV. Youth, specifically racial/ethnic minority young men who have sex with men (YMSM), continue to acquire new HIV infections and have been shown to be less likely to engage in regular HIV care and adhere to scheduled medical visits. The goal of the current study was to evaluate the characteristics of participants and program delivery that were associated with early linkage and retention in HIV care among HIV-infected YMSM of color enrolled in an outreach, linkage, and retention study. Of the 334 patients included in the linkage analysis, 72% were linked to care within 30 days of diagnosis, 81% within 60 days, and 87% within 90 days. While no patient-level characteristics were associated with early linkage, having the person who provided the positive HIV test result refer the patient to HIV care (p=0.048), specifically calling to make the appointment (p=0.009), was associated with earlier linkage. Retention of Latino participants (96.2%) was significantly higher than for the African-American (79.9%) youth (p=0.006). Overall, 221 participants had at least 1 year of possible follow-up and 82.8% of these participants were retained at 1 year. While unique challenges exist in the care of adolescents infected with HIV from identification to engagement and retention in clinical care, programs that are responsive and dedicated to the needs of these youth can be successful in retaining them in care.


Aids Patient Care and Stds | 2011

Racial and sexual identity-related maltreatment among minority YMSM: prevalence, perceptions, and the association with emotional distress

Lisa B. Hightow-Weidman; Gregory Phillips; Karen Jones; Angulique Y. Outlaw; Sheldon D. Fields; Justin C. Smith

Bullying is a form of violence characterized as an aggressive behavior that is unprovoked and intended to cause harm. Prior studies have found that lesbian, gay, bisexual, and transgender (LGBT) youth experience high levels of bullying related to their sexuality and this harassment can lead to engagement in risk behaviors, depression, and suicide. Ethnic/racial minority young men who have sex with men (YMSM) may experience dual levels of stigma and maltreatment due to both their sexuality and their race. The aim of the current study was to assess the prevalence and perceptions of racial and sexual identity-based abuse among a sample of minority YMSM, and whether this maltreatment plays a role in the emotional distress of these youth. We found that overall 36% and 85% of participants experienced racial and sexuality-related bullying, respectively. There was a significant association between experiencing a high level of sexuality-related bullying and depressive symptomatology (p=0.03), having attempted suicide (p=0.03), and reporting parental abuse (p=0.05). We found no association between racial bullying and suicide attempts. In a multivariable logistic regression model, experiencing any racial bullying and high sexuality-related bullying were significant predictors of having a CES-D score ≥16; adjusted odds ratio (OR) 1.83 and 2.29, respectively. These findings contribute to the existing literature regarding the negative experiences and daily stressors facing LGBT youth with regard to both their minority status and LGBT identities. Future interventions for racial/ethnic minority YMSM should provide assistance to achieve a positive view of self that encompasses both their racial and sexual identities.


Journal of The Optical Society of America A-optics Image Science and Vision | 1987

Cooperative phenomena in the perception of motion direction.

Douglas W. Williams; Gregory Phillips

A percept of global coherent motion can result from the combination of many different localized motion vectors. We report here evidence of hysteresis in the perception of this global motion, obtained with random-dot cinematograms. The hysteresis characteristics are relatively robust with respect to changes in dot density, display area, and location. Changing the directional content of the stimulus, however, did alter the hysteresis profile in a manner consistent with a model incorporating cooperative interactions among direction-selective motion mechanisms. Our results lend further support to a cooperative interpretation of motion results lend further support to a cooperative interpretation of motion perception in random-dot cinematograms.


Aids Care-psychological and Socio-medical Aspects of Aids\/hiv | 2011

House/ball culture and adolescent African-American transgender persons and men who have sex with men: A synthesis of the literature

Gregory Phillips; James Peterson; Diane Binson; Julia Hidalgo; Manya Magnus

Abstract Transgender persons and young men of color who have sex with men (YMSM of color) have been severely affected by HIV in the USA. Houses and balls in the USA have historically been a primary meeting ground for YMSM of color and transgender people, offering an opportunity for HIV prevention activities. Houses provide a familial structure for YMSM of color and transgender people, while balls provide them with events at which they can congregate for social support and entertainment. A comprehensive literature search was conducted using Scopus and PubMed, Internet websites, and HIV prevention and care resources for YMSM of color associated with a multisite evaluation. Houses and balls have been responsive to the HIV/AIDS epidemic and have developing networks that are critical in providing a social and familiar context for often-disenfranchised youth. The organizations have embraced the need for HIV prevention, and their methodology may be transferable to other prevention contexts. Future studies are needed to identify culturally appropriate and effective methods of integration of house/ball methods into HIV prevention services aimed at transgender persons and YMSM of color.


Journal of Urban Health-bulletin of The New York Academy of Medicine | 2013

Differing HIV Risks and Prevention Needs among Men and Women Injection Drug Users (IDU) in the District of Columbia

Manya Magnus; Irene Kuo; Gregory Phillips; Anthony Rawls; James Peterson; Luz Montanez; Yujiang Jia; Jenevieve Opoku; Nnemdi Kamanu-Elias; Flora Hamilton; Angela Wood; Alan E. Greenberg

Washington, DC has among the highest HIV/AIDS rates in the US. Gender differences among injection drug users (IDUs) may be associated with adoption of prevention opportunities including needle exchange programs, HIV testing, psychosocial support, and prevention programming. National HIV Behavioral Surveillance data on current IDUs aged ≥18 were collected from 8/09 to 11/09 via respondent-driven sampling in Washington, DC. HIV status was assessed using oral OraQuick with Western Blot confirmation. Weighted estimates were derived using RDSAT. Stata was used to characterize the sample and differences between male and female IDU, using uni-, bi-, and multivariable methods. Factors associated with HIV risk differed between men and women. Men were more likely than women to have had a history of incarceration (86.6 % vs. 66.8 %, p < 0.01). Women were more likely than men to have depressive symptoms (73.9 % vs. 47.4 %, p < 0.01), to have been physically or emotionally abused (66.1 % vs. 16.1 %, p < 0.0001), to report childhood sexual abuse (42.7 % vs. 4.7 %, p < 0.0001), and pressured or forced to have sex (62.8 % vs. 4.0 %, p < 0.0001); each of these differences was significant in the multivariable analysis. Despite a decreasing HIV/AIDS epidemic among IDU, there remain significant gender differences with women experiencing multiple threats to psychosocial health, which may in turn affect HIV testing, access, care, and drug use. Diverging needs by gender are critical to consider when implementing HIV prevention strategies.


Aids and Behavior | 2013

Patterns of HIV Disclosure and Condom Use Among HIV-Infected Young Racial/Ethnic Minority Men Who Have Sex with Men

Lisa B. Hightow-Weidman; Gregory Phillips; Angulique Y. Outlaw; Amy Rock Wohl; Sheldon D. Fields; Julia Hildalgo; Sara LeGrand

Recent findings highlight the continued rise in cases of HIV infection among racial/ethnic minority young men who have sex with men (YMSM). In adults, disclosure of HIV status has been associated with decreased sexual risk behaviors but this has not been explored among YMSM. In this study of 362 HIV-infected racial/ethnic minority YMSM, rates of disclosure were high, with almost all disclosing their status to at least one person at baseline. The majority had disclosed to a family member, with higher disclosure rates to female relatives compared with males. After adjustment for site, disclosure to sex partners and boyfriends was associated with an increase in condom use during both oral and anal sex. Future studies should consider skills training to assist youth in the disclosure process, facilitate how to determine who in their family and friend social network can be safely disclosed to and support family-based interventions.ResumenLos resultados recientes destacan el continuo aumento de los casos de infección por VIH entre los hombres de las minorías raciales/étnicas jóvenes que tienen sexo con hombres (YMSM). En los adultos, la revelación del estado de VIH se ha asociado con una disminución de las conductas sexuales de riesgo, pero esto no ha sido explorado entre YMSM. En este estudio de 362 infectados por el VIH YMSM minoría racial/étnico, las tasas de revelación fueron altas, con casi toda revelación de su estado al menos una persona en la línea base. La mayoría había revelado a un miembro de la familia, con tasas más altas de divulgación a familiares mujeres en comparación con los varones. Después del ajuste para el sitio, la revelación a las parejas sexuales y los novios se asoció con un aumento en el uso del condón durante el sexo oral y anal. Los estudios futuros en cuenta la formación profesional para ayudar a los jóvenes en el proceso de divulgación, facilitar la forma de determinar quién en su familia y la red social puede ser amigo de forma segura y compartida con las intervenciones de apoyo basadas en la familia.

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Manya Magnus

George Washington University

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Irene Kuo

George Washington University

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Alan E. Greenberg

George Washington University

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Anthony Rawls

George Washington University

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James Peterson

George Washington University

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Lisa B. Hightow-Weidman

University of North Carolina at Chapel Hill

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Jenevieve Opoku

Centers for Disease Control and Prevention

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