Dynamics and optimal control of a spatial diffusion HIV/AIDS model with ART and PrEP treatments

In this paper, to investigate the synthetic effect of PrEP (pre-exposure prophylaxis) and ART (antiretrovial therapy) on HIV transmission among MSM (men who have sex with men) in heterogenous environment, an realistic HIV epidemic model with spatial diffusion is established. Here, HIV infectious people are divided into three immunity based compartments, i.e., CD4+ T cell count less than 350, between 350 and 500, and more than 500, respectively. The basic reproduction number $R_0$ is established and proved as a threshold parameter: The global asymptotic stability of the disease-free steady state holds for $R_0<1$, and the disease will be present if $R_0>1$. Considering the substantial advantages of PrEP and ART in controlling HIV transmissions among MSM, the optimal control problem is presented for the case of positive constant diffusion coefficients, which minimize the total population of susceptible individual and HIV infected individual, the cost of PrEP and ART thearpy. As an illustration of our theoretical results, we conduct numerical simulations. We also conduct an optimal control case study where model parameters are estimated from the demographic and epidemiological data from China. This work suggests: (1) Spatial factors cannot be ignored during the HIV intervention; (2)Taking the PrEP intervention measure for HIV transmissions among MSM as early as possible will help to improve the control efficiency and reduces its cost; (3) Reducing the PrEP drug costs will promote the efficiency of PrEP treatment in preventing the spread of HIV among MSM.

Complement Receptor 3 Mediates HIV-1 Transcytosis across an Intact Cervical Epithelial Cell Barrier: New Insight into HIV Transmission in Women

In women, the lower female reproductive tract is the primary site for HIV infection. How HIV traverses the epithelium to infect CD4 T cells in the submucosa is ill-defined.

HIV Knowledge and Stigmatizing Attitude towards People Living with HIV/AIDS among Medical Students in Jordan

The stigmatizing attitude towards people living with HIV/AIDS (PLWHA) can be a major barrier to effective patient care. As future physicians, medical students represent a core group that should be targeted with focused knowledge and adequate training to provide patient care without prejudice. The aim of the current study was to examine HIV/AIDS knowledge, and the stigmatizing attitude towards PLWHA, among medical students in Jordan. The current study was based on a self-administered online questionnaire, which was distributed during March–May 2021, involving students at the six medical schools in Jordan, with items assessing demographics, HIV/AIDS knowledge, and HIV/AIDS stigmatizing attitude, which was evaluated using the validated HIV-stigma scale. The total number of respondents was 1362, with predominance of females (n = 780, 57.3%). Lack of HIV/AIDS knowledge among the study participants was notable for the following items: HIV transmission through breastfeeding (40.8% correct responses), HIV is not transmitted through saliva (42.6% correct responses), and vertical transmission of HIV can be prevented (48.8% correct responses). Approximately two-thirds of the respondents displayed a positive attitude towards PLWHA. For six out of the 14 HIV/AIDS knowledge items, lack of knowledge was significantly correlated with a more negative attitude towards PLWHA. Multinomial regression analysis showed that a significantly more negative attitude towards PLWHA was found among the pre-clinical students compared to the clinical students (odds ratio (OR): 0.65, 95% confidence interval (CI): 0.43–0.97, p = 0.036); and that affiliation to medical schools that were founded before 2000 was associated with a more positive attitude towards PLWHA compared to affiliation to recently founded medical schools in the country (OR: 1.85, 95% CI: 1.42–2.42, p < 0.001). About one-third of medical students who participated in the study displayed a negative attitude towards PLWHA. Defects in HIV/AIDS knowledge were detected for aspects involving HIV transmission and prevention, and such defects were correlated with a more negative attitude towards PLWHA. It is recommended to revise the current medical training curricula, and to tailor improvements in the overall HIV/AIDS knowledge, which can be reflected in a more positive attitude towards PLWHA, particularly for the recently established medical schools in the country.

Disruption of natural killer cell homing as a biomarker in persons aging with or without HIV

Natural killer (NK) cells are critical modulators of HIV transmission and disease. While recent evidence suggests a loss of NK cell cytotoxicity during aging, a compound analysis of NK cell biology and aging in persons with HIV (PWH) is lacking. We set out to perform one of the first large comprehensive analyses of people aging with and without HIV to determine NK phenotypic changes during aging and how these changes are modulated while aging with HIV. Utilizing high-dimensional polychromatic flow cytometry we analyzed 30 immune-related proteins spanning broad functions such as trafficking, activation/inhibition, NK specific receptors, and memory/checkpoint receptors on peripheral NK cells from health donors, PWH with viral suppression, and viremic PWH. NK cell phenotypes are dynamic across the age span but are significantly altered in HIV and ART and with co-factors such as CMV. Specifically, NK cells in healthy aging show increasing levels of ⍺4β7 and decreasing CCR7 expression during aging, a phenomenon nearly perfectly reversed in PWH. These HIV-associated trafficking changes could be in part due to NK cell recruitment to HIV reservoir formation in lymphoid tissue or failed mucosal signaling in the HIV-infected gut, but regardless appear to be tight biomarkers of age-related NK cell changes.

Fetal-maternal surgery for spina bifida in a HIV-infected mother

INTRODUCTION: In select cases, in utero surgery for MMC leads to better outcomes than postnatal repair. However, maternal HIV infection constitutes a formal exclusion criterion due to the potential of vertical HIV transmission. Encouraged by a previous case of a successful fetal spina bifida repair in a Hepatitis Bs antigen positive woman, a plan was devised allowing for fetal surgery. CASE REPORT: In utero MMC repair was performed although the mother was HIV-infected. To minimize the risk of in utero HIV transmission, the mother was treated by HAART throughout gestation as well as intravenous zidovudine administration during maternal-fetal surgery. The mother tolerated all procedures very well without any sequelae. The currently 20 month-old toddler, is HIV negative and has significantly benefitted from fetal surgery. DISCUSSION/CONCLUSION: This case shows that maternal HIV is not a priori a diagnosis that excludes fetal surgery. Rather, it might be a surrogate for moving towards personalized medicine and away from applying too rigorous exclusion criteria in the selection of candidates for maternal-fetal surgery.

HIV Preexposure Prophylaxis Training in Family Medicine Residencies: A National Survey

Background and Objectives: Preexposure prophylaxis (PrEP) reduces HIV transmission among high-risk individuals. Yet, the HIV epidemic continues to expand among marginalized populations and America’s Southeastern states. Various barriers remain to PrEP uptake, namely provider knowledge and education. We sought to investigate residency training, competency, and prescribing of PrEP among population size. Additionally, we asked program directors to identify barriers to PrEP. Methods: We surveyed family medicine program directors as part of the Council of Academic Family Medicine Educational Research Alliance survey from January 2018 through February 2018. Results: Our survey questions had a 52.9% (276/522) response rate. No programs in rural communities less than 30,000 population (0/27) reported significant PrEP training for their residents; those in nonrural communities of at least 30,000 reported this training more frequently (41/246, 16.7%). Compared to Fischer expected values, the finding was statistically significant (P=.019); using a 75,000 population demarcation lowered significance (P=.192). We found programs that identify significant PrEP training also cite more PrEP prescribing within their practice (OR 7.27, P&lt;.001). Programs with significant training also report their residents graduate with greater PrEP competency (OR 18.33, P&lt;.001). The largest barriers identified were faculty expertise, not having enough high-risk patients, inadequate screening, and resident knowledge/training. Conclusions: We identified natural associations between increased training in PrEP and perceived PrEP competencies. We identified a lack of significant PrEP training and associated PrEP competencies in rural residency programs. Barriers identified in this study can help inform curricular needs to improve primary care workforce capacity to lower HIV risk.

The Paradoxes of PrEP: Rejection, Reluctancy, and Novel Gay Identities in Biomedical HIV Prevention in Serbia

This article explores the different ways in which gay men in Serbia perceive PrEP as a novel method of HIV prevention. In the article, I draw on data from my research on PrEP use among thirty gay men in Belgrade. The use of PrEP is still very low amongst gay communities in Serbia due to their rejection of PrEP and due to the stigma around PrEP use. In Serbia, the social significance of PrEP relates to HIV status disclosure on gay social/dating media. Paradoxically, on gay dating sites, the signifier "PrEP" blurs the line between HIV positive gay men – who have achieved undetectable HIV status through a potent ARV therapy – and those HIV negative gay men who use PrEP as a preventative tool against HIV transmission. In the article, I will argue that a new form of gay identity has emerged on gay dating apps in Serbia – "undetectable, on PrEP." This new identity emerges from confusion in HIV risk assessment. The use of PrEP has been seen as a marker to denote someone’s HIV negative status and to protect them from HIV transmission. However, some gay men with an undetectable HIV status would like to be regarded as HIV negative even though they are not, and thus they use the signifier "on PrEP" to highlight their desire to claim an HIV negative status. PrEP has many symbolic valences: from HIV status disclosure to assumed promiscuity. As I will argue, while the health paradigm is of utmost importance for Serbian gay men, internalized stigma additionally drives the low uptake of PrEP amongst gay communities in Serbia, thus contributing to the confusion regarding PrEP use and the overall approach to HIV prevention. This article finds that those respondents who accept PrEP without stigma or confusion regarding their HIV status are also more willing and ready to recommend using PrEP to other gay men.

Prevalence of Prenatal HIV Screening in Massachusetts: Examining Patterns in Prenatal HIV Screening Using the Massachusetts Pregnancy Risk Assessment Monitoring System (PRAMS), 2007-2016

Prenatal HIV screening is critical to eliminate mother-to-child (MTC) HIV transmission. Although Massachusetts (MA) has near-zero MTC transmission rates, recent trends in statewide prenatal HIV testing are unknown. This study examined variations in prenatal HIV screening across race/ethnicity, socioeconomic status, and prenatal care settings in MA, in the period following national and state-level changes in guidance encouraging routine prenatal HIV testing. According to the MA Pregnancy Risk Assessment Monitoring System (PRAMS) data, 68.3% of pregnant women in MA were screened for HIV between 2007 and 2016. There were significant differences in prenatal screening rates across race/ethnicity, with 83.38% of Black non-Hispanic (NH), 85.5% of Hispanic women, and 62.4% of White NH women reporting being tested for HIV at some point during their pregnancy ( P <.0001). Multivariate regression found that differences in screening were explained by race/ethnicity, Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) status, prenatal care site, type of insurance, nativity, and marital status. Annual rates of prenatal HIV screening did not change significantly in MA from 2007 to 2016 ( P = .27). The results of the analysis revealed that prenatal HIV screening rates differ based on race/ethnicity, with higher rates in Black NH and Hispanic women when compared to White NH women. The racial disparities in prenatal HIV screening and lack of universal screening in MA raises questions about the effectiveness of the state's approach.

Healthcare Providers in Africa Face HIV and AIDS Challenges in Providing Services to a Key Population: Infant and Young Child Feeding

There is agreement on the benefits of exclusive breastfeeding for 6 months and the introduction of appropriate complementary foods at 6 months, followed by continued breastfeeding, for all infants. However, infant, and young child feeding (IYCF) guidelines for HIV-positive mothers have changed on a regular basis since 2000. Considering new HIV treatment guidelines, implementation challenges, and knowledge gaps, this article investigates issues and Evidence related to IYCF for the prevention and care of paediatric HIV in resource-limited settings. The effectiveness of antiretroviral medications (ARVs) in decreasing the incidence of HIV transmission from mother to child prompted WHO to urge countries to support either avoidance or treatment. Significant progress has been made in terms of preserving the lives of moms but also decreasing the spread of HIV among children, but long-term political, financial, and scientific commitment is essential for ensuring effective postnatal HIV prevention programs and providing for the nutritional requirements of HIV-exposed and HIV-infected infants.