COVID-19 Stroke Apical Lung Examination Study 2: a national prospective CTA biomarker study of the lung apices, in patients presenting with suspected acute stroke (COVID SALES 2)

BACKGROUND

Apical ground-glass opacification (GGO) identified on CT angiography (CTA) performed for suspected acute stroke was developed in 2020 as a coronavirus-disease-2019 (COVID-19) diagnostic and prognostic biomarker in a retrospective study during the first wave of COVID-19.

OBJECTIVE

To prospectively validate whether GGO on CTA performed for suspected acute stroke is a reliable COVID-19 diagnostic and prognostic biomarker and whether it is reliable for COVID-19 vaccinated patients.

METHODS

In this prospective, pragmatic, national, multi-center validation study performed at 13 sites, we captured study data consecutively in patients undergoing CTA for suspected acute stroke from January-March 2021. Demographic and clinical features associated with stroke and COVID-19 were incorporated. The primary outcome was the likelihood of reverse-transcriptase-polymerase-chain-reaction swab-test-confirmed COVID-19 using the GGO biomarker. Secondary outcomes investigated were functional status at discharge and survival analyses at 30 and 90 days. Univariate and multivariable statistical analyses were employed.

RESULTS

CTAs from 1,111 patients were analyzed, with apical GGO identified in 8.5 % during a period of high COVID-19 prevalence. GGO showed good inter-rater reliability (Fleiss κ = 0.77); and high COVID-19 specificity (93.7 %, 91.8-95.2) and negative predictive value (NPV; 97.8 %, 96.5-98.6). In subgroup analysis of vaccinated patients, GGO remained a good diagnostic biomarker (specificity 93.1 %, 89.8-95.5; NPV 99.7 %, 98.3-100.0). Patients with COVID-19 were more likely to have higher stroke score (NIHSS (mean +/- SD) 6.9 +/- 6.9, COVID-19 negative, 9.7 +/- 9.0, COVID-19 positive; p = 0.01), carotid occlusions (6.2 % negative, 14.9 % positive; p = 0.02), and larger infarcts on presentation CT (ASPECTS 9.4 +/- 1.5, COVID-19 negative, 8.6 +/- 2.4, COVID-19 positive; p = 0.00). After multivariable logistic regression, GGO (odds ratio 15.7, 6.2-40.1), myalgia (8.9, 2.1-38.2) and higher core body temperature (1.9, 1.1-3.2) were independent COVID-19 predictors. GGO was associated with worse functional outcome on discharge and worse survival after univariate analysis. However, after adjustment for factors including stroke severity, GGO was not independently predictive of functional outcome or mortality.

CONCLUSION

Apical GGO on CTA performed for patients with suspected acute stroke is a reliable diagnostic biomarker for COVID-19, which in combination with clinical features may be useful in COVID-19 triage.

An Exploration of Rural Housing Insecurity as a Public Health Problem in California's Rural Northern Counties

Although widely acknowledged as an important social determinant of health, until recently researchers and policymakers have primarily approached housing insecurity as an urban issue, obscuring the visibility of its impacts in rural contexts, including the ways in which housing insecurity intersects with other health and structural inequities facing rural populations. Working to address this gap in the existing literature, this paper explores the experiences of housing insecurity in a rural context by reporting on an analysis of 210 in-depth interviews with 153 adults between the ages of 18-35, living in California's rural North State, a relatively overlooked far northern region of the state comprised of 12 north central and north eastern counties. Using in-depth qualitative interview data, we conducted an exploratory pattern-level analysis of participants' narratives structured by four dimensions of housing insecurity defined in the literature (housing affordability, housing stability, housing conditions, and neighborhood context). Drawing attention to the pervasiveness of rural housing insecurity within our sample, this analysis highlights the unique ways in which rurality creates distinct experiences not currently captured in the existing literature. Further research is needed across different types of rural communities to better understand the various ways that housing insecurity affects the everyday lives and health of rural residents. By grounding research within the experiences of rural residents, we are better able to respond to the crisis of rural housing insecurity and develop solutions that are tailored to rural residents' unique needs.

Harm perceptions of vaping nicotine relative to cigarette smoking among sexual and gender minority young adults

INTRODUCTION

To address gaps in existing research, the current study used a mixed-methods approach to describe, contextualise and understand harm perceptions of vaping nicotine relative to cigarette smoking and associations with nicotine and tobacco (NT) use among young adults who identify their genders and sexualities in ways that classify them as sexual and gender minorities (SGM).

METHODS

Results are based on cross-sectional surveys and online qualitative interviews with 98 SGM young adults (18-25 years old) in California's San Francisco Bay Area who currently or formerly used combustible tobacco. We generated a measure assessing participants' relative harm perceptions of e-cigarette use versus cigarette smoking and identified those who perceived cigarette smoking as more harmful than e-cigarette use compared to those who perceived it to be equally or less harmful.

RESULTS

We found that relative harm perceptions of cigarette smoking versus e-cigarette use are likely related to much uncertainty and confusion about the harms of e-cigarette use. Moreover, findings illustrate that public health messages regarding the risks of e-cigarette use may have unintended consequences of increasing cigarette use to replace e-cigarette use for some SGM young adults, a practice that is incongruent with scientific evidence demonstrating that cigarettes and other combustible tobacco products are riskier than e-cigarettes and other forms of NT use.

DISCUSSION AND CONCLUSIONS

Results suggest the need for evidence-based, clear, and direct messaging about the relative harms of cigarettes versus e-cigarettes to reduce NT-related inequities in SGM populations.

'I can't make perfect choices all the time': Perspectives on Tobacco Harm Reduction among SGM Young Adults

INTRODUCTION

Cigarette smoking is among the most harmful ways to consume nicotine and tends to be concentrated among socially marginalized groups of people, including sexual and gender minorities (SGM). Though some approaches to tobacco control in the U.S. are harm reduction strategies (e.g. smoke-free environments), often abstinence is an explicitly-stated goal and discussions of tobacco harm reduction (THR) are controversial, particularly for young people. Despite this controversy in the tobacco field, emerging research suggests that THR may be gaining momentum as a "community-led" rather than 'public health-led' health practice. To date, little is known about how SGM young adults negotiate their use of tobacco products, particularly in terms of minimizing the harms associated with smoking.

METHODS

We conducted 100 in-depth interviews with SGM young adults ages 18-25 living in the San Francisco Bay Area, to better understand participant perceptions and everyday practices related to THR.

RESULTS

A thematic analysis of interview narratives revealed the ways in which participants relied upon various THR strategies while balancing their wellbeing within the context of broader socio-structural harms. Participants' narratives also underscored beliefs about the importance of pragmatic, nonjudgmental, and person-centered approaches to preventing inequities in tobacco-related illnesses.

CONCLUSIONS

Findings represent a significant departure from the mainstream discourse in the United States surrounding THR, by revealing how understanding the practice of THR among SGM young adults who use nicotine and tobacco can be instrumental in shaping approaches to tobacco control policy and prevention that may ultimately help to reduce inequities in tobacco-related illnesses.

IMPLICATIONS

Findings from this study present the perspectives and practices of tobacco harm reduction among sexual and gender minority young adults and emphasize the importance of integrating this approach in tobacco control to better achieve tobacco-related equity. Results can be used to better design tobacco prevention, treatment, and policy strategies that are compassionate and responsive to the needs of these important priority populations.

Protection against invasive meningococcal disease and vaccination policy in the Netherlands

Background

A rise in serogroup C invasive meningococcal disease (IMD-C) led to introduction of MenC vaccination in 2002 in the Netherlands at 14 months of age, accompanied by a mass-campaign for all children between 1 and 18 years (coverage 94%). Due to an IMD-W outbreak in 2016-17, the MenC vaccine was replaced by a MenACWY vaccine and an adolescent booster at 14 years was introduced next to a mass campaign for 14-18 year-olds in 2018.

Aim/methods

We explored meningococcal antibody status in the Netherlands across the population in 2006-07, 2016-17 and 2020 in consecutive cross-sectional serosurveillance studies. Furthermore, we assessed the vaccine impact and effectiveness of the recent MenACWY vaccination campaign. We determined long-term protection in both adolescents and adults after a MenACWY vaccination and investigated sex-related differences in the vaccine response in adolescents.

Results

MenC antibody levels were low in 2016-17, except in recently vaccinated toddlers and individuals who were vaccinated as teenagers in 2002. We demonstrated waning of MenC immunity 15 years after the mass campaign and highlighted the lack of meningococcal AWY immunity across the population, which underlined the importance of the recently introduced MenACWY (booster) vaccination. The MenACWY vaccination program was effective in preventing IMD-W in the target population. Long-term protection was achieved for MenC, MenW, and MenY in 94-96% of adolescents five years postvaccination, but in adults only in 32%, 65% and 71% for MenC, W and Y. Adolescent antibody responses were higher in girls than in boys for all serogroups at most timepoints after MenACWY vaccination. The differences in average titers were however small and the percentage of participants with protective titers was very high for both sexes.

Conclusions

The current meningococcal vaccination policy in the Netherlands provides protection across the population against IMD-ACWY and seems sufficient on the long-term.

Key messages

"BLURRING THE LINE:" INTOXICATION, GENDER, CONSENT AND SEXUAL ENCOUNTERS AMONG YOUNG ADULTS

Social concern about sexual practices and sexual consent among young adults has increased significantly in recent years, and intoxication has often played a key role in such debates. While many studies have long suggested that alcohol plays a role in facilitating (casual) sexual encounters, intoxication has largely either been conceptualized as a risk factor, or researchers have focused on the pharmacological effects of alcohol on behaviors associated with sexual interaction and consent. To date little work has explored how young adults define and negotiate acceptable and unacceptable levels of intoxication during sexual encounters, nor the ways in which different levels of intoxication influence gendered sexual scripts and meanings of consent. This paper explores the latter two research questions using data from 145 in-depth, qualitative interviews with cisgender, heterosexual young adults ages 18-25 in the San Francisco Bay Area. In examining these interview data, by exploring the relationship between intoxication and sexual consent, and the ways in which gender plays out in notions of acceptable and unacceptable intoxicated sexual encounters, we highlight how different levels of intoxication signal different sexual scripts. Narratives about sexual encounters at low levels of intoxication highlighted the role of intoxication in achieving sexual sociability, but they also relied on the notion that intoxicated consent was dependent on the social relationship between the partners outside drinking contexts. Narratives about sexual encounters in heavy drinking situations were more explicitly gendered, often in keeping with traditionally gendered sexual scripts. In general we found that when men discussed their own levels of intoxication, their narratives were more focused on sexual performance and low status sex partners, while women's and some men's narratives about women's levels of intoxication were focused on women's consent, safety, and respectability. Finally, some participants rely on 'consent as a contract' and 'intoxication parity'- the idea that potential sexual partners should be equally intoxicated - to handle relations of power in interpersonal sexual scripts. Since these notions are sometimes deployed strategically, we suggest that they may serve to "black-box" gendered inequalities in power between the parties involved.

Understanding the Impact of COVID-19 on Tobacco and Nicotine Use among Young Adults Identified as Sexual and Gender Minorities: A Mixed Methods Approach

We investigated the perceived impact of COVID-19 on changes in tobacco and nicotine (NT) use among sexual and gender minority (SGM) young adults. We used a mixed methods approach that included closed- and open-ended survey questions and in-depth interviews. Participants were 53 SGM young adults in California who reported current or past cigarette smoking. Of study participants, 63% (n=33) reported any changes in their NT use, and of those, 60% reported initial increase of NT use. Content analysis of an open-ended survey question revealed three reported reasons for changes in NT use: (1) changes in routine activities (27%), (2) stress (46%), and (3) health (24%). Thematic analysis of qualitative interviews identified several related themes: (1) in discussions of increased NT use, stress and boredom/free time were important aspects of changes to daily routines, (2) fluctuations in NT use behaviors occurred over time, (3) reasons for NT changes were multiple and intertwined, and (4) NT use changes were shaped by experiences related to intersectional forms of structural and social stigmatization. Results reveal the dynamic and complex ways in which participants described their pandemic-related changes in NT use-nuance that is crucial for compassionate and participant-centered approaches to tobacco prevention and cessation.

Perioperative intravenous contrast administration and the incidence of acute kidney injury after major gastrointestinal surgery: prospective, multicentre cohort study

BACKGROUND

This study aimed to determine the impact of preoperative exposure to intravenous contrast for CT and the risk of developing postoperative acute kidney injury (AKI) in patients undergoing major gastrointestinal surgery.

METHODS

This prospective, multicentre cohort study included adults undergoing gastrointestinal resection, stoma reversal or liver resection. Both elective and emergency procedures were included. Preoperative exposure to intravenous contrast was defined as exposure to contrast administered for the purposes of CT up to 7 days before surgery. The primary endpoint was the rate of AKI within 7 days. Propensity score-matched models were adjusted for patient, disease and operative variables. In a sensitivity analysis, a propensity score-matched model explored the association between preoperative exposure to contrast and AKI in the first 48 h after surgery.

RESULTS

A total of 5378 patients were included across 173 centres. Overall, 1249 patients (23·2 per cent) received intravenous contrast. The overall rate of AKI within 7 days of surgery was 13·4 per cent (718 of 5378). In the propensity score-matched model, preoperative exposure to contrast was not associated with AKI within 7 days (odds ratio (OR) 0·95, 95 per cent c.i. 0·73 to 1·21; P = 0·669). The sensitivity analysis showed no association between preoperative contrast administration and AKI within 48 h after operation (OR 1·09, 0·84 to 1·41; P = 0·498).

CONCLUSION

There was no association between preoperative intravenous contrast administered for CT up to 7 days before surgery and postoperative AKI. Risk of contrast-induced nephropathy should not be used as a reason to avoid contrast-enhanced CT.

Is Smoking Queer? Implications of California Tobacco Denormalization Strategies for Queer Current and Former Smokers

This article is concerned with normative conceptions of health structuring tobacco control strategies designed to "denormalize" tobacco use. Analysis of 201 interviews with non-heterosexual and/or non-cisgender adults in California revealed that participants implicated tobacco use in exacerbating health inequities and perpetuating harmful narratives of queer suffering, but also regarded smoking as a critical tool for self-care and symbol of resistance. Participant narratives suggest that using stigma in health promotion efforts which reinforce normative conceptions of health may be harmful to queer people whose social identities exist within ongoing legacies of pathology, health stigma, and deviance from hegemonic structural norms.

Queer Youth, Intoxication and Queer Drinking Spaces

Research on intoxicating substances and gender has developed considerably in the last 30 years, especially in the social sciences as feminist scholars highlighted the contradictory discourses about young women's intoxication. Nevertheless, there still remain significant gaps if we are to fully understand the role and meaning of intoxication for all young people and not merely for heterosexual, cisgender young people. As a way of exploring the possible limitations of this legacy, we will examine the qualitative data from 52 in-depth interviews with self-identified LGBTQ young people. Our analysis explores the relationships between meanings of intoxication and sexual and gender identities, drinking spaces, and the extent to which notions of masculinity and femininity influence alcohol consumption and drinking practices among LGBTQ youth. As gender expressions among young people, especially those who identify as LGBTQ, become increasingly nuanced and fluid, understanding the role of social and cultural practices of alcohol consumption in the performance of sexual and gender identities may increase our understanding of the ways in which sexuality and gender influence alcohol consumption.

The "here and now" of youth: the meanings of smoking for sexual and gender minority youth

BACKGROUND

The mainstream tobacco field in the USA tends to situate youth as passive, particularly in terms of their susceptibility to industry manipulation and peer pressure. However, failing to acknowledge youths' agency overlooks important meanings youth ascribe to their tobacco use and how those meanings are shaped by the circumstances and structures of their everyday lives.

METHODS

This article is based on analysis of 58 in-depth qualitative interviews conducted with sexual and gender minority youth living in the San Francisco Bay area in California. Topics covered in interviews focused on meanings of tobacco in the lives of youth. Interviews lasted approximately 2.5 h and were transcribed verbatim and linked with ATLAS.ti, a qualitative data analysis software. Following qualitative coding, narrative segments were sorted into piles of similarity identified according to principles of pattern-level analysis to interpret to what extent meanings of smoking for young people may operate as forms of resistance, survival, and defense.

RESULTS

Analysis of our participants' narratives highlights how smoking is connected to what Bucholtz calls the "'here-and-now' of young people's experience, the social and cultural practices through which they shape their worlds" as active agents (Bucholtz, Annu Rev Anthropol31:525-52, 2003.). Specifically, narratives illustrate how smoking signifies "control" in a multitude of ways, including taking control over an oppressor, controlling the effects of exposure to traumatic or day-to-day stress, and exerting control over the physical body in terms of protecting oneself from violence or defending one's mental health.

CONCLUSIONS

These findings call into question the universal appropriateness of foundational elements that underlie tobacco control and prevention efforts directed at youth in the USA, specifically the focus on abstinence and future orientation. Implications of these findings for research, prevention, and policy are discussed, emphasizing the risk of furthering health inequities should we fail to acknowledge the "here and now" of youth.

N-cadherin is required for cytodifferentiation during zebrafish odontogenesis

N-cadherin is a well-studied classic cadherin involved in multiple developmental processes and is also known to have a signaling function. Using the zebrafish (Danio rerio) as a model, we tested the hypothesis that tooth morphogenesis is accompanied by dynamic changes in N-cadherin distribution and that absence of N-cadherin disturbs tooth development. N-cadherin, encoded by the gene cdh2, is absent during the initiation and morphogenesis stages of both primary (first-generation) and replacement teeth, as demonstrated by immunohistochemistry. However, N-cadherin is up-regulated at the onset of differentiation of cells of the inner dental epithelium and the dental papilla, i.e., the ameloblasts and odontoblasts, respectively. In the inner dental epithelium, N-cadherin is co-expressed with E-cadherin, excluding the occurrence of cadherin switching such as observed during human tooth development. While early lethality of N-cadherin knockout mice prevents any functional study of N-cadherin in mouse odontogenesis, zebrafish parachute (pac) mutants, deficient for N-cadherin, survive beyond the age when primary teeth normally start to form. In these mutants, the first tooth forms, but its development stops at the early cytodifferentiation stage. N-cadherin deficiency also completely inhibits the development of the other first-generation teeth, possibly due to the absence of N-cadherin signaling once the first tooth has differentiated.

The results of two multicenter, open-label studies assessing efficacy, tolerability and safety of protiramer, a high molecular weight synthetic copolymeric mixture, in patients with relapsing–remitting multiple sclerosis

Objective

Two pilot studies were conducted to evaluate safety, tolerability, and efficacy of two doses of Protiramer (TV-5010) in patients with relapsing–remitting multiple sclerosis.

Background

Both glatiramer acetate and TV-5010 are synthetic copolymers comprised the same four amino acids in a defined molar ratio. TV-5010 has higher average molecular weight than Glatiramer acetate and might be hypothesized that glatiramoids with higher molecular weight might be more immunoreactive than lower molecular weight peptides, thus increasing therapeutic potential and allowing for less frequent dosing.

Methods

In the two separate studies, after a 10 week pretreatment period, TV-5010 was given subcutaneously once weekly at 15 mg and 30 mg for 36 weeks. The primary end point was a reduction in the number of magnetic resonance imaging active lesions (i.e., T1-weigthed gadolinium-enhancing and new T2-weighted lesions) between the pretreatment period and the end of study.

Results

Both TV-5010 doses were generally well tolerated. The treatment with TV-5010 at a dose of 15 mg/wk did not show any significant effect. In contrast, in patients treated with at a dose of 30 mg/wk, a significant reduction in the mean number of gadolinium-enhancing (−58.8%; P = 0.0013) and new T2-W (−50%; P = 0.0002) lesions was observed. However, a large decrease in the mean number of both gadolinium-enhancing (−55%) and new T2-W (−40%) lesions during the pretreatment period made difficult the interpretation of the efficacy assessments.

Conclusions

Further studies are needed to confirm these preliminary data on safety and efficacy of TV-5010 at a weekly dose of 30 mg.

Development of research capability in Ethiopia: the Ethio-Netherlands HIV/AIDS Research Project (ENARP), 1994-2002

History of the Ethio-Netherlands HIV/AIDS Research Project (ENARP), 1994-2002 and Ethiopia's HIV/AIDS Prevention and Control Council.

Calibration of a proton beam energy monitora)

Delivery of therapeutic proton beams requires an absolute energy accuracy of +/-0.64 to 0.27 MeV for patch fields and a relative energy accuracy of +/-0.10 to 0.25 MeV for tailoring the depth dose distribution using the energy stacking technique. Achromatic switchyard tunes, which lead to better stability of the beam incident onto the patient, unfortunately limit the ability of switchyard magnet tesla meters to verify the correct beam energy within the tolerances listed above. A new monitor to measure the proton energy before each pulse is transported through the switchyard has been installed into a proton synchrotron. The purpose of this monitor is to correct and/or inhibit beam delivery when the measured beam energy is outside of the tolerances for treatment. The monitor calculates the beam energy using data from two frequency and eight beam position monitors that measure the revolution frequency of the proton bunches and the effective offset of the orbit from the nominal radius of the synchrotron. The new energy monitor has been calibrated by measuring the range of the beam through water and comparing with published range-energy tables for various energies. A relationship between depth dose curves and range-energy tables was first determined using Monte Carlo simulations of particle transport and energy deposition. To reduce the uncertainties associated with typical scanning water phantoms, a new technique was devised in which the beam energy was scanned while fixed thickness water tanks were sandwiched between two fixed parallel plate ionization chambers. Using a multitude of tank sizes, several energies were tested to determine the nominal accelerator orbit radius. After calibration, the energy reported by the control system matched the energy derived by range measurements to better than 0.72 MeV for all nine energies tested between 40 and 255 MeV with an average difference of -0.33 MeV. A study of different combinations of revolution frequency and radial offsets to test the envelope of algorithm accuracy demonstrated a relative accuracy of +/-0.11 MeV for small energy changes between 126 and 250 MeV. These new measurements may serve as a data set for benchmarking range-energy relationships.

Drug susceptibility of Mycobacterium tuberculosis in HIV-infected and -uninfected Ethiopians and its impact on outcome after 24 months of follow-up

From a prospective cohort study on tuberculosis/human immunodeficiency virus (TB/HIV) interaction in Addis Ababa, Ethiopia, drug susceptibility results were available for 94 TB patients (46% HIV-infected). Resistance to one or more drug(s) was detected in 21 (22.3%) and multidrug resistance in five (5.3%) patients. Occurrence of resistance was not related to HIV status or outcome after 24 months of follow-up. However, among HIV-infected TB patients who died during follow-up, survival time in those with a resistant Mycobacterium tuberculosis strain was significantly shorter compared to those with a sensitive strain (6 vs. 13 months). Early detection of drug resistance and timely treatment change can therefore have a positive impact on survival in HIV-infected TB patients.

Performance of routine syphilis serology in the Ethiopian cohort on HIV/AIDS

OBJECTIVES

To assess the performance of routine syphilis screening during 5 year follow up of Ethiopian factory workers, participating in a cohort study on HIV/AIDS.

METHODS

Syphilis serology test results of factory workers, who each donated at least six blood samples were evaluated. Screening in 1997-8 had been performed by the Treponema pallidum particle agglutination (TPPA) assay and in 1999-2001 by the rapid plasma reagin (RPR) test. TPPA had been followed by RPR or RPR by TPPA, in case of a positive screening result. Samples of study subjects showing inconsistent sequential TPPA and/or RPR results were retested independently by three laboratory technicians.

RESULTS

A total of 540 cohort participants (8.3% HIV positive at enrollment) donated 4,376 blood samples (mean 8.3 per subject). From 93 of the 176 participants with at least one positive TPPA result during follow up, 152 samples were retested by RPR and/or TPPA. Based on the revised syphilis test results, the 540 cohort participants were classified as having no (70.5%), past (20.6%), prevalent (6.9%), or incident (2.0%) syphilis. The RPR screening test was difficult to interpret and yielded 8.2% biological false positive (BFP) RPR results, or 3.2% if weak positive results were excluded. There was no correlation between HIV infection and BFP RPR reactions. Sample mix-ups were detected in 1.2%.

CONCLUSION

Evaluation of routine syphilis screening as performed in a long term cohort study on HIV/AIDS in Ethiopia showed difficulties encountered in syphilis screening programmes such as a high percentage of BFP RPR, inconsistencies in interpretation of the RPR test, and sample mix ups. The findings stress the need to develop a syphilis screening assay that is easy to perform and interpret and to implement quality assurance programmes.

Low CD4+ T-cell count and high HIV viral load precede the development of tuberculosis disease in a cohort of HIV-positive Ethiopians

SETTING

Prospective cohort study, Ethiopia.

OBJECTIVE

To study changes in biological markers of HIV infection progression before and after development of TB disease.

DESIGN

A longitudinal study of 804 adult factory workers (95 HIV-positive, 709 HIV-negative), who were followed every 6 months for a median of 3.8 years.

RESULTS

Overall, the incidence rate of TB was 10/222 = 45.1 (95%CI 24.3-83.9) per 1000 person-years of observation (PYO) among HIV-1-positive participants, compared to 14/2054 = 6.8 (95%CI 4.0-11.5) per 1000 PYO among HIV-1-negative participants (incidence rate ratio 6.62, 95%CI 2.94-14.9). Among the 10 HIV-positive participants who subsequently developed TB disease, the CD4 count was low (median 201/microliter, range 45-419), and viral load high (median 4.97 log copies/ml, range 3.70-5.58), at the routine follow-up visit prior to TB diagnosis. Following TB treatment, plasma viral load remained persistently elevated despite clinical resolution of TB disease, and seven of the 10 patients died within a median time of 8 months.

CONCLUSION

In this cohort, HIV-infected Ethiopians who developed TB disease already had low CD4 counts and high viral load prior to the diagnosis of TB. Viral load did not decrease following TB treatment, leading to a poor overall prognosis in these patients.

Low CD4+ T-cell count and high HIV viral load precede the development of tuberculosis disease in a cohort of HIV-positive ethiopians

SETTING

Prospective cohort study, Ethiopia.

OBJECTIVE

To study changes in biological markers of HIV infection progression before and after development of TB disease.

DESIGN

A longitudinal study of 804 adult factory workers (95 HIV-positive, 709 HIV-negative), who were followed every 6 months for a median of 3.8 years.

RESULTS

Overall, the incidence rate of TB was 10/ 222 = 45.1 (95%CI 24.3-83.9) per 1000 person-years of observation (PYO) among HIV-1-positive participants, compared to 14/2,054 = 6.8 (95%CI 4.0-11.5) per 1,000 PYO among HIV-1-negative participants (incidence rate ratio 6.62, 95%CI 2.94-14.9). Among the 10 HIV-positive participants who subsequently developed TB disease, the CD4 count was low (median 201/microl, range 45-419), and viral load high (median 4.97 log copies/ml, range 3.70-5.58), at the routine follow-up visit prior to TB diagnosis. Following TB treatment, plasma viral load remained persistently elevated despite clinical resolution of TB disease, and seven of the 10 patients died within a median time of 8 months.

CONCLUSION

In this cohort, HIV-infected Ethiopians who developed TB disease already had low CD4 counts and high viral load prior to the diagnosis of TB. Viral load did not decrease following TB treatment, leading to a poor overall prognosis in these patients.

Right aortic arch symptomatic in adulthood

We present a patient with progressive dysphagia and shortness of breath due to a right aortic arch with aberrant left subclavian artery that became symptomatic in adulthood. Diagnosis was made after a delay because the possibility of a congenital anomaly was not considered when the patient presented with dysphagia. A review is given of the incidence, embryology, aetiology, diagnostic evaluation and management, as well as a discussion of other congenital aortic arch anomalies.

Quantitative and functional differences in CD8+ lymphocyte responses in resolved acute and chronic hepatitis C virus infection

CD8+ T lymphocyte responses are important in the clearance of viral infections. In chronic infections they may contribute to pathogenesis. To investigate the role of CD8+ T lymphocyte responses in viral clearance and chronic hepatitis C we have compared hepatitis C virus (HCV) specific cytotoxicity and interferon-gamma (IFN-gamma) production in patients with resolved-acute, and chronic HCV infection. CD8+ T cell responses to a panel of 13 HCV T cell peptide epitopes were studied using Elispot assays of IFN-gamma production and chromium release cytotoxicity assays. Responses of seven patients with resolved acute HCV infection were compared with those of 14 chronically infected patients. HCV-specific cytotoxicity differentiated the two populations of patients. The majority (71%) of patients with resolved acute infection tested positive to 42% of relevant peptides compared with the minority (28%) of patients with chronic hepatitis C (P=0.03) who responded to only 8% of relevant peptides (P=0.0009). In contrast, HCV-specific IFN-gamma production was detected in 86% of patients with either resolved or chronic infection in response to 42% and 35%, respectively, of relevant peptides tested (not significant). In patients with chronic infection the magnitude of the HCV-specific IFN-gamma production was inversely correlated to viral load (R2=0.52; P=0.042). Failure to clear HCV infection may be attributable to the presence of noncytolytic IFN-gamma producing CD8+ T lymphocytes in chronically infected patients. However these CD8+ T cells may play a beneficial role in contributing to the control of viral load in chronic hepatitis C.

Effects of pubovaginal sling procedure on patients with urethral hypermobility and intrinsic sphincteric deficiency: would they do it again?

OBJECTIVE

This study was undertaken to assess the cure rate of stress urinary incontinence, long-term effects on other lower urinary tract symptoms, and quality of life in a cohort of patients who underwent pubovaginal sling procedures for treatment of incontinence related to intrinsic sphincteric deficiency and urethral hypermobility.

STUDY DESIGN

This was a retrospective analysis of 57 patients with 90% follow-up who underwent pubovaginal autologous fascial sling procedures for stress urinary incontinence related to urethral hypermobility and intrinsic sphincteric deficiency. Objective postoperative urodynamic evaluation was performed in 34 (60%) of the cases. Telephone interviews to assess quality-of-life parameters were performed in all cases.

RESULTS

The mean follow-up period was 42 months and the median follow-up period was 34 months, with a range of 0.5 to 134 months. The age at the time of the sling procedure ranged from 18 to 84 years, with a median parity of 3.0 (range, 0-6). Preoperative body mass index ranged from 19.5 to 39.1 kg/m(2). Five percent of patients had detrusor instability before the operation. Forty-one percent (41%) of the patients who underwent postoperative urodynamic evaluation had voiding dysfunction. The postoperative objective cure rate for stress urinary incontinence was 97%. Of all patients 88% indicated that the sling had improved the quality of life, 84% indicated that the sling relieved the incontinence in the long-term, and 82% would choose to undergo the procedure again.

CONCLUSION

Construction of a pubovaginal sling is an effective technique for relief of severe stress urinary incontinence. Voiding dysfunction is a common side effect. Despite this problem, a significant number of patients would elect to undergo the procedure again.

The HIV epidemic and the state of its surveillance in Ethiopia

A review of the information on the HIV epidemic in Ethiopia is important to guide policy and action. Published and unpublished reports and surveillance data from records of governmental and non-governmental institutions were examined to assess the extent of the epidemic. It appears that the HIV/AIDS epidemic has affected a large segment of the urban population. Surveillance data from pregnant women attending antenatal clinics indicate a decreasing trend in the prevalence of HIV in Addis Ababa. Similarly, data from blood donors from the majority of transfusion centres in the country indicate a decrease in prevalence. However, further studies will be required to establish the validity of these findings. Currently available data are not adequate to accurately measure the level of infection in rural areas where 85% of the population live. Outside of Addis Ababa, in places where ANC-based sentinel surveillance are operational, the systems are not fully supported by quality control. Thus, there are concerns regarding the validity of reported results. The impact of HIV/AIDS epidemic in Ethiopia needs to be further quantified both in its burden of diseases and its impact on the urban and rural economy and society. It is, therefore, important that effort and adequate resources are put into strengthening surveillance systems.

Development of capillary electrophoresis as an alternative to high resolution agarose electrophoresis for the diagnosis of multiple sclerosis

The presence of oligoclonal bands in cerebrospinal fluid (CSF) is used as a diagnostic indicator of multiple sclerosis (MS). These bands, gamma-globulins thought to result from a restricted antibody response directed against autoantigens or viral antigens, are consistent with CSF-specific immunoglobulin synthesis when observed in the spinal fluid and not in the serum. Current methodology commonly involves electrophoresing concentrated CSF with high-resolution agarose gel electrophoresis (HRAGE) followed by protein staining in order to visualize the oligoclonal bands. Capillary zone electrophoresis (CZE) was evaluated as an alternative method. Separation of CSF and serum proteins from 54 patients in a bare silica capillary containing a high pH borate buffer allowed for resolution of the five major zones including the gamma-region and showed a 90% concordance with the results from HRAGE banding studies. Since a simple borate buffer did not provide adequate resolution of the oligoclonal bands in the gamma-region, the separation buffer was augmented with polyethylene glycol (PEG) which provided a significant enhancement in resolution of proteins in this region (24 patient study). In addition to obtaining banding information from electropherograms obtained with these separation conditions, it was feasible to calculate a CSF Index which compared favorably with the results from nephelometry. Finally, we show that zwitterionic additives such as O-phosphorylethanolamine may further enhance resolution and that capallary electrophoresis (CE) may allow oligoclonal banding information to be obtained directly from CSF without concentration.

Prospective study of serum protein capillary zone electrophoresis and immunotyping of monoclonal proteins by immunosubtraction

Capillary zone electrophoresis and immune adsorption were evaluated for identification of serum protein abnormalities and immunotyping of monoclonal proteins. A 7-capillary, electrophoresis instrument and solid phase immunosubtraction reagents were used in a prospective study of 1,518 patients. Serum protein electrophoresis was performed by agarose gel electrophoresis and capillary electrophoresis and interpreted with regard to identification of abnormalities consistent with monoclonal gammopathies. The agarose gel electrophoresis had a sensitivity and specificity of 91% and 99%, respectively, whereas capillary electrophoresis gave results of 95% and 99%. Immunotyping of the monoclonal proteins was performed by immunofixation and immunosubtraction. Capillary electrophoresis was more sensitive than agarose gel electrophoresis for the identification of monoclonal proteins in serum. In addition, the immunosubtraction method seems technically simpler and more automated than immunofixation and represents a useful additional approach for immunotyping monoclonal proteins.

Seroprevalence of hepatitis markers; HAV, HBV, HCV and HEV amongst primary school children in Freetown, Sierra Leone

The prevalence of hepatitis markers (Hepatitis A, B, C and E) in primary school children in Freetown, Sierra Leone was investigated in a government school, representative of the urban middle class. The children were aged between 6-12 years old. A sub-sample (n = 120) of the 450 pupils were invited to participate. Of the 66 volunteers (mean 8.32 years) 12 were positive for HBsAg (males 9, females 3) and 11 were confirmed. Six of these were HBeAg positive, anti-HBe negative, (male 5, female 1). Whilst 6 were HBeAg negative, anti-HBe positive (male 4, female 2). HBcAb was present in 47 children (71%). Hepatitis A, C and E antibodies were detected in 64 (97%), 1 (2%) and 5 (8%) of children respectively.

Identification of monoclonal proteins in serum: a quantitative comparison of acetate, agarose gel, and capillary electrophoresis

A selected group of 308 sera were analyzed by capillary electrophoresis (CE), agarose gel electrophoresis (AGE), and cellulose acetate electrophoresis (CAE) and evaluated for abnormalities that would suggest the presence of a monoclonal protein. The sensitivity (an electrophoretic abnormality in sera that contained a monoclonal protein) and specificity (a normal electrophoretic pattern in sera that did not contain a monoclonal protein) was determined for each electrophoretic procedure. CAE was the most specific procedure and CE was the most sensitive. The increase in sensitivity of CE was primarily due to increased detection of cryoglobulins and free light chains. The quantitation of the gamma region and/or monoclonal antibody peaks by CE was similar to results obtained by AGE. Quantitation of very large monoclonal protein peaks (> 3.0 g/dL) by on-line absorption detection (CE) yielded higher results than quantitation by dye-binding (AGE).

Acute hepatitis C viral infection during pregnancy: failure of mother to infant transmission

A pregnant woman developed an acute hepatitis C virus (HCV) type 3a infection during the second trimester of pregnancy. The clinical virological features are presented, including HCV RNA quantification of maternal serum samples collected during pregnancy. These findings are discussed in light of the child's remaining uninfected after 5 years of follow-up.

Determinants of participation in state-of-the-art cancer prevention, early detection/screening, and treatment trials among African-Americans

It has been suggested that the greatest potential for reducing cancer mortality in high-risk populations may be realized through aggressive implementation of prevention, diagnostic, and state-of-the-art treatment programs and increasing participation in cancer trials. However, the national data suggest that African-Americans are most often underrepresented in such programs and/or trials. Multiple factors are assumed to contribute to this situation, but currently few studies have been conducted to validate their influence. A study focused on identifying factors that contribute to participation of African-Americans in investigational cancer programs and/or trials was therefore conducted. Two hundred twenty African-American men and women were recruited to participate in a regional survey. There was evidence to support the impact that perceptions, attitudes, and beliefs have on willingness to participate in investigational programs and/or trials. The factor having the greatest influence on willingness to participate in investigational programs and/or trials was perceived efficacy of the investigational programs and/or trials. Among this sample there was an apparent hesitancy of many to participate in research programs and/or trials. The prevailing belief that such programs and/or trials were only for those with the disease or condition under study appeared to influence their response. However, when provided information on the opportunities for participation in prevention, diagnostic, and treatment programs and/or projects for those within the general community (especially for those at higher risk) and on the benefits of participation, a much greater willingness to participate was expressed by participants.

The Mycobacterium tuberculosis 38-kDa antigen: overproduction in Escherichia coli, purification and characterization

The 38-kDa protein (Ag38) of the Gram+ bacterium, Mycobacterium tuberculosis H37Rv, is an immunodominant antigen of potential utility for diagnosis and vaccine development. Assessment of this potential requires large amounts of the purified protein that would be difficult, if not impossible, to obtain from M. tuberculosis itself. The gene coding for Ag38 had been previously cloned and in the present study was expressed as an unfused protein in Escherichia coli under the control of strong transcriptional (bacteriophage lambda pLpR) and translational (atpE) signals. Fermentation of the recombinant E. coli K-12 strain CAG629[pMS9-2], which is deficient in Lon protease and the heat-shock response, produced recombinant Ag38 (reAg38) at high levels (about 10% of total cellular protein). The reAg38, which accumulated as inclusion bodies, was completely solubilized in 6 M guanidine.HCl, refolded and purified to apparent homogeneity. The product showed the expected amino acid composition and M(r), and had similar reactivities as the native protein with three different mAb. Polyclonal antibodies raised against reAg38 reacted strongly with the native antigen in enzyme-linked immunosorbent assay. These results demonstrate that reAg38, which cannot be distinguished antigenically from the native protein of M. tuberculosis, can be prepared in quantity from E. coli.

Subacute idiopathic demyelinating polyradiculoneuropathy

Seven cases of subacute idiopathic demyelinating polyradiculoneuropathy had a monophasic illness characterized by progressive weakness of all four limbs that evolved during 4 to 8 weeks. Neurophysiological investigations implied demyelination in all seven cases. In two patients, sural nerve biopsy specimens that were taken showed macrophage-associated demyelination. All patients made substantial or complete recoveries with oral prednisolone (four cases) or without treatment (three cases). None of the patients required ventilation or had autonomic complications. These cases provide a link between the acute idiopathic demyelinating form of Guillain-Barré syndrome and chronic idiopathic demyelinating polyradiculoneuropathy.

High cell density fermentation of recombinant Escherichia coli with computer-controlled optimal growth rate

In recent years recombinant DNA technology has enabled us to produce various proteins of therapeutic importance with microorganisms. As an appropriate host organism, E. coli plays a dominant role. Yields of E. coli dry cell mass in shaker flask culture range from 1-2 g/L, whereas in fermentors up to 10 g dry cells/L can be achieved. ZIMET and GBF have developed a high cell density fermentation process that produces E. coli (on a glucose/mineral salt medium) up to more than 100 g dry cells/L in a special fed-batch mode. This cultivation strategy prevents oxygen limitation and hence the accumulation of acetate and other metabolic byproducts. The specific growth rate can be adjusted so that product formation reaches its optimum value. An example of the production of alpha1-interferon is presented. The high cell density fermentations were realized in 30- and 450-L Chemap fermentors (ZIMET) and in a three-stage bioreactor scale-up system (72, 300, and 1,500 L) developed in cooperation with GBF and B. Braun Melsungen AG. Multiloop controllers were used to control the process variables.

Bone-alkaline phosphatase as indicator of bone formation

Bone-alkaline phosphatase was determined in patients at risk of osteoporosis due to treatment with oral corticosteroids, and in patients at risk of increased bone synthesis because of treatment with cyclosporin. Both a significant decrease of bone-alkaline phosphatase during corticosteroid treatment, and a significant increase of bone-alkaline phosphatase during cyclosporin treatment could be demonstrated. It is concluded that bone-alkaline phosphatase is a useful parameter for monitoring changes in bone formation.

Factors contributing to health promotion behaviors among African-American men

Few studies reported in the literature address healthcare trends of African-American men. A study of health promotion behaviors of African-American men was undertaken using a health beliefs framework. The study examined the cancer-related knowledge, attitudes, and perceptions (KAP) of a select group of African-American men to evaluate their influence on health promotion behaviors. The health beliefs framework was very useful in predicting the health promotion behaviors of African-American men. Significant relationships were observed between the variables of knowledge of early warning signs of cancer, attitudes related to screening procedures, perceptions of seriousness of cancer, and cancer risk reduction and early detection health promotion behaviors. The results reinforce earlier reports indicating the pronounced effects of knowledge, attitudes, and perceptions on the use of health-promoting activities.