The serogroup B meningococcal outer membrane vesicle-based vaccine 4CMenB induces cross-species protection against Neisseria gonorrhoeae.

There is a pressing need for a gonorrhea vaccine due to the high disease burden associated with gonococcal infections globally and the rapid evolution of antibiotic resistance in Neisseria gonorrhoeae (Ng). Current gonorrhea vaccine research is in the stages of antigen discovery and the identification of protective immune responses, and no vaccine has been tested in clinical trials in over 30 years. Recently, however, it was reported in a retrospective case-control study that vaccination of humans with a serogroup B Neisseria meningitidis (Nm) outer membrane vesicle (OMV) vaccine (MeNZB) was associated with reduced rates of gonorrhea. Here we directly tested the hypothesis that Nm OMVs induce cross-protection against gonorrhea in a well-characterized female mouse model of Ng genital tract infection. We found that immunization with the licensed Nm OMV-based vaccine 4CMenB (Bexsero) significantly accelerated clearance and reduced the Ng bacterial burden compared to administration of alum or PBS. Serum IgG and vaginal IgA and IgG that cross-reacted with Ng OMVs were induced by 4CMenB vaccination by either the subcutaneous or intraperitoneal routes. Antibodies from vaccinated mice recognized several Ng surface proteins, including PilQ, BamA, MtrE, NHBA (known to be recognized by humans), PorB, and Opa. Immune sera from both mice and humans recognized Ng PilQ and several proteins of similar apparent molecular weight, but MtrE was only recognized by mouse serum. Pooled sera from 4CMenB-immunized mice showed a 4-fold increase in serum bactericidal50 titers against the challenge strain; in contrast, no significant difference in bactericidal activity was detected when sera from 4CMenB-immunized and unimmunized subjects were compared. Our findings directly support epidemiological evidence that Nm OMVs confer cross-species protection against gonorrhea, and implicate several Ng surface antigens as potentially protective targets. Additionally, this study further defines the usefulness of murine infection model as a relevant experimental system for gonorrhea vaccine development.

Estimating Chlamydia and Gonorrhea Burden Among US Army Soldiers From Military Health System Data: Mind the Gap.

BACKGROUND: Reporting systems are commonly used for chlamydia and gonorrhea surveillance and community burden assessments. Estimates are conservative given high proportions of asymptomatic cases and underreporting. The military's unified health system, which includes laboratory and medical encounter data, could offer insight into surveillance gaps and improve burden analyses. METHODS: Confirmed chlamydia and gonorrhea cases reported among active component soldiers were merged with laboratory and medical encounter records indicative of infection to identify incident cases during 2015-2019. Case capture across data systems was assessed, and reported case rates were compared with those derived from the enhanced 3-source database. Attributable medical encounters for total cases were extrapolated using average visits for the subset of cases with supporting encounter data. Multivariable generalized linear models were generated to characterize infections. RESULTS: Approximately 83% and 76% of respective chlamydia and gonorrhea cases were identified through reporting, compared with 87% and 67% through laboratory records, and 58% for both through medical encounters. Rates from enhanced 3-source surveillance peaked at 2844 chlamydia and 517 gonorrhea cases per 100,000 person-years in 2019, reflecting 17% and 28% increases in respective rates compared with reported rates. Overall, 3163 cases of chlamydia and/or gonorrhea per 100,000 person-years were detected in 2019, affecting 13,004 soldiers and requiring an estimated 21,690 medical encounters. Soldiers who were younger, female, racial/ethnic minorities, nonmarried, enlisted, less educated, and Southern residents had significantly higher risk. CONCLUSION: Integration of laboratory and medical encounter data substantially improved burden estimation over reporting alone. Rates generated remain conservative because they only reflect documented cases. Increasing rates support prevention prioritization, particularly among young soldiers.

A Comparative Analysis of Reported Chlamydia and Gonorrhea Cases Among US Army Soldiers, 2015 to 2019.

BACKGROUND: Chlamydia and gonorrhea have increased nationally and in the US Army. Rates reported in the Army are elevated relative to the general population, partly because of differing population demographics. METHODS: Age- and sex-specific chlamydia and gonorrhea case rates among Army active component soldiers and the wider 18- to 64-year-old US adult population were computed from reports submitted through national and military surveillance systems in 2015 to 2019. Rates were standardized using the 2015 Army age and sex population distribution. Multivariable generalized linear models were generated to evaluate associated risk factors. RESULTS: Army age- and sex-adjusted chlamydia rates (per 100,000 person-years) were nearly twice those of US adults (2019 rates, 2317 vs. 1241), whereas US age- and sex-adjusted gonorrhea rates surpassed Army rates (2019 rates, 536 vs. 396). Chlamydia and gonorrhea rates were significantly elevated in Army women younger than 25 years relative to US women aged 18 to 24 years (2015-2019 crude rates, 10,404 Army/4243 US for chlamydia and 1014 Army/694 US for gonorrhea). Gonorrhea rates were significantly elevated in US men aged 25 to 44 years (2015-2019 crude rates, 506 US/251 Army and 223 US/86 Army for men aged 25-34 and 35-44 years, respectively). Age, sex, and race-ethnicity were significantly associated with infection among soldiers. CONCLUSIONS: Observed increases in chlamydia and gonorrhea and identified risk factors are consistent with those reported nationally. Higher adjusted chlamydia rates among soldiers may reflect greater individual or sexual network risks, screening biases, or increased health care access. The Army's lower adjusted gonorrhea rates may reflect differences in high-risk subgroups (e.g., men who have sex with men), differing sexual networks, or other confounders.

Risk factors associated with gonorrhea and chlamydia transmission in selected health facilities in Ghana.

BACKGROUND: Understanding the underlying epidemiology that shapes Neisseria gonorrhoeae (GC), and Chlamydia trachomatis (CT) infections can contribute to data driven policies directed towards curbing the proliferation of these pathogens in Ghana. Information on the symptoms and risk factors for STIs will help to identify high-risk individuals which will in turn inform STI syndromic management and tailor the use of public health resources. METHODS: Participants were from 4 military clinics and 1 civilian STI clinic in Ghana and eligible if they had symptoms suggestive of STI. First void urine samples were collected and tested with Nucleic Acid Amplification Test (NAAT). A structured questionnaire was administered to all participants. Multivariate logistic regression identified factors associated with infection, separately for NG and for CT and for men and women. RESULTS: A total of 950 patients, 58% of whom were females were enrolled, 28% had gonorrhea and 11% had chlamydia with more males testing positive than females. Reported symptoms that were more common among patients who tested positive for gonorrhea were painful urination and urethral discharge (all P values < 0.05). Additionally, multiple sexual partners and alcohol use were statistically associated with higher rates of gonorrhea in males while only the frequency of condom use was associated with gonorrhea for females. None of the symptoms or risk factors except marital status was associated with testing positive for chlamydia. CONCLUSION: Identifying these symptoms and risk factors help inform health care delivery systems for STIs in Ghana. Furthermore, men and women presenting with these symptoms and risk factors are a prime target for public health education campaigns, aimed at curbing the spread of gonorrhea and chlamydia infections.

HIV Preexposure Prophylaxis in the U.S. Military Services - 2014-2016.

Human immunodeficiency virus (HIV) infection is a substantial health concern for the U.S. Department of Defense (DoD) and for service members stationed throughout the world. Each year, approximately 350 new HIV infections are diagnosed in members of the U.S. military services, with most infections acquired within the United States (1). The DoD populations most affected by HIV mirror those in the U.S. civilian population; the highest rates of new military diagnoses are in men and blacks or African Americans (blacks) (1). Blacks are disproportionally affected, and most new diagnoses occur among men who have sex with men (MSM). HIV preexposure prophylaxis (PrEP) is approximately 90% effective in preventing HIV infection when used properly (2), and an increasing number of active duty personnel have used HIV prevention services and PrEP in the military health system since the repeal of "Don't Ask, Don't Tell"* in 2011 (3). Military health system and service records were reviewed to describe HIV PrEP use among military personnel, and military health care providers were surveyed to assess HIV PrEP knowledge and attitudes. Among 769 service members prescribed PrEP during February 1, 2014-June 10, 2016, 60% received prescriptions from an infectious disease provider, 19% were black men, and 42% were aged >28 years. Half of surveyed military health care providers self-rated their PrEP knowledge as poor. DoD is developing new policy to address access to care challenges by defining requirements and establishing pathways for universal patient access to PrEP.

Detection of pathogenic bacteria in ticks from Isiolo and Kwale counties of Kenya using metagenomics.

Ticks are arachnid ectoparasites that rank second only to mosquitoes in the transmission of human diseases including bacteria responsible for anaplasmosis, ehrlichiosis, spotted fevers, and Lyme disease among other febrile illnesses. Due to the paucity of data on bacteria transmitted by ticks in Kenya, this study undertook a bacterial metagenomic-based characterization of ticks collected from Isiolo, a semi-arid pastoralist County in Eastern Kenya, and Kwale, a coastal County with a monsoon climate in the southern Kenyan border with Tanzania. A total of 2,918 ticks belonging to 3 genera and 10 species were pooled and screened in this study. Tick identification was confirmed through the sequencing of the Cytochrome C Oxidase Subunit 1 (COI) gene. Bacterial 16S rRNA gene PCR amplicons obtained from the above samples were sequenced using the MinION (Oxford Nanopore Technologies) platform. The resulting reads were demultiplexed in Porechop, followed by trimming and filtering in Trimmomatic before clustering using Qiime2-VSearch. A SILVA database pretrained naïve Bayes classifier was used to classify the Operational Taxonomic Units (OTUs) taxonomically. The bacteria of clinical interest detected in pooled tick assays were as follows: Rickettsia spp. 59.43% of pools, Coxiella burnetii 37.88%, Proteus mirabilis 5.08%, Cutibacterium acnes 6.08%, and Corynebacterium ulcerans 2.43%. These bacteria are responsible for spotted fevers, query fever (Q-fever), urinary tract infections, skin and soft tissue infections, eye infections, and diphtheria-like infections in humans, respectively. P. mirabilis, C. acnes, and C. ulcerans were detected only in Isiolo. Additionally, COI sequences allowed for the identification of Rickettsia and Coxiella species to strain levels in some of the pools. Diversity analysis revealed that the tick genera had high levels of Alpha diversity but the differences between the microbiomes of the three tick genera studied were not significant. The detection of C. acnes, commonly associated with human skin flora suggests that the ticks may have contact with humans potentially exposing them to bacterial infections. The findings in this study highlight the need for further investigation into the viability of these bacteria and the competency of ticks to transmit them. Clinicians in these high-risk areas also need to be appraised for them to include Rickettsial diseases and Q-fever as part of their differential diagnosis.

Isolation and Growth Kinetics of Bogoria Virus from Phlebotomine Sandflies Sampled in Baringo, Kenya.

Phleboviruses are an emerging threat to public health. Recent surveillance efforts in Kenya have unveiled novel phleboviruses. Despite these efforts, there remain knowledge gaps. This study tested female sandflies from diverse ecological settings in Kenya for arboviruses. Sandfly pools were cultured in Vero-CCL cells. Pools showing reproducible cytopathic effects were subjected to next-generation sequencing, followed by phylogenetic analysis. In vitro, cell kinetics analysis was performed using both Vero-E6 cells and C6/36 mosquito cells. One pool from Baringo, Kenya, tested positive for Bogoria virus (BOGV). The BOGV genome clustered in a single clade with previously obtained BOGV genomes. No significant differences were observed between Vero and C6/36 cell growth kinetics. This study has confirmed the presence of BOGV among sandflies in Baringo Kenya and demonstrated growth in mosquito cells.

Comparative analysis of peripheral whole blood transcriptome from asymptomatic carriers reveals upregulation of subsets of surface proteins implicated in Plasmodium falciparum phenotypic plasticity.

The molecular mechanism underlying Plasmodium falciparum's persistence in the asymptomatic phase of infection remains largely unknown. However, large-scale shifts in the parasites' gene expression during asymptomatic infections may enhance phenotypic plasticity, maximizing their fitness and leading to the persistence of the asymptomatic infections. To uncover these mechanisms, we aimed to identify parasite genetic factors implicated in asymptomatic infections through whole transcriptome analysis. We analyzed publicly available transcriptome datasets containing asymptomatic malaria (ASM), uncomplicated malaria (SM), and malaria-naïve (NSM) samples from 35 subjects for differentially expressed genes (DEGs) and long noncoding RNAs. Our analysis identified 755 and 1773 DEGs in ASM vs SM and NSM, respectively. These DEGs revealed sets of genes coding for proteins of unknown functions (PUFs) upregulated in ASM vs SM and ASM, suggesting their role in underlying fundamental molecular mechanisms during asymptomatic infections. Upregulated genes in ASM vs SM revealed a subset of 24 clonal variant genes (CVGs) involved in host-parasite and symbiotic interactions and modulation of the symbiont of host erythrocyte aggregation pathways. Moreover, we identified 237 differentially expressed noncoding RNAs in ASM vs SM, of which 11 were found to interact with CVGs, suggesting their possible role in regulating the expression of CVGs. Our results suggest that P. falciparum utilizes phenotypic plasticity as an adaptive mechanism during asymptomatic infections by upregulating clonal variant genes, with long noncoding RNAs possibly playing a crucial role in their regulation. Thus, our study provides insights into the parasites' genetic factors that confer a fitness advantage during asymptomatic infections.

Genome sequences of Phasi Charoen-like phasivirus and Fako virus from Aedes aegypti mosquitoes collected in coastal Kenya.

We report the sequencing of two viruses, Phasi Charoen-like phasivirus (PCLV) and Fako virus (FAKV), which were detected in a pool of Aedes aegypti from Kenya. Analysis showed a high similarity of PCLV to publicly available PCLV genomes from Kenya. FAKV showed a high genetic divergence from publicly available FAKV genomes.

In Vitro Pre-Clinical Evaluation of a Gonococcal Trivalent Candidate Vaccine Identified by Transcriptomics.

Gonorrhea, a sexually transmitted disease caused by Neisseria gonorrhoeae, poses a significant global public health threat. Infection in women can be asymptomatic and may result in severe reproductive complications. Escalating antibiotic resistance underscores the need for an effective vaccine. Approaches being explored include subunit vaccines and outer membrane vesicles (OMVs), but an ideal candidate remains elusive. Meningococcal OMV-based vaccines have been associated with reduced rates of gonorrhea in retrospective epidemiologic studies, and with accelerated gonococcal clearance in mouse vaginal colonization models. Cross-protection is attributed to shared antigens and possibly cross-reactive, bactericidal antibodies. Using a Candidate Antigen Selection Strategy (CASS) based on the gonococcal transcriptome during human mucosal infection, we identified new potential vaccine targets that, when used to immunize mice, induced the production of antibodies with bactericidal activity against N. gonorrhoeae strains. The current study determined antigen recognition by human sera from N. gonorrhoeae-infected subjects, evaluated their potential as a multi-antigen (combination) vaccine in mice and examined the impact of different adjuvants (Alum or Alum+MPLA) on functional antibody responses to N. gonorrhoeae. Our results indicated that a stronger Th1 immune response component induced by Alum+MPLA led to antibodies with improved bactericidal activity. In conclusion, a combination of CASS-derived antigens may be promising for developing effective gonococcal vaccines.

Therapeutic response to artemisinin combination therapies among individuals with Plasmodium falciparum single infection vs mixed Plasmodium species infections: a retrospective posthoc analysis in Kisumu County, western Kenya.

OBJECTIVES: This study examined the treatment response of mixed vs single-species Plasmodium falciparum infections to artemisinin-based combination therapies (ACTs). METHODS: A total of 1211 blood samples collected on days 0, 7, 14, 21, 28, 35, and 42 from 173 individuals enrolled in two randomized ACT efficacy studies were tested for malaria using 18s ribosomal RNA-based real-time polymerase chain reaction. All recurrent parasitemia were characterized for Plasmodium species composition and time to reinfection during 42-day follow-up compared across ACTs. RESULTS: Day 0 samples had 71.1% (116/163) single P. falciparum infections and 28.2% (46/163) coinfections. A total of 54.0% (88/163) of individuals tested positive for Plasmodium at least once between days 7-42. A total of 19.3% (17/88) of individuals with recurrent infections were infected with a different Plasmodium species than observed at day 0, with 76.5% (13/17) of these "hidden" infections appearing after clearing P. falciparum present at day 0. Artesunate-mefloquine (16.4 hours) and dihydroartemisinin-piperaquine (17.6 hours) had increased clearance rates over artemether-lumefantrine (21.0 hours). Dihydroartemisinin-piperaquine exhibited the longest duration of reinfection prophylaxis. Cure rates were comparable across each species composition. CONCLUSION: No differences in clearance rates were found depending on whether the infection contained species other than P. falciparum. Significantly longer durations of protection were observed for individuals treated with dihydroartemisinin-piperaquine.

Sexually Transmitted Infections in the U.S. Military: A Sexual Health Paradigm to Address Risk Behaviors, Unintended Pregnancy, Alcohol Use, and Sexual Trauma.

To address the ongoing epidemic of sexually transmitted infections (STIs) in the United States, the National Academies of Sciences, Engineering, and Medicine (National Academies) conducted a consensus study on STI control and prevention in the United States to provide recommendations to the Centers for Disease Control and Prevention and the National Association of County and City Health Officials. The culminating report identified military personnel as one of the priority groups that require special consideration given the high prevalence of STIs and their associated behaviors (e.g., concurrent sexual partners and infrequent condom use) that occur during active duty service. Universal health care access, the relative ease and frequency of STI screening, and the educational opportunities within the military are all assets in STI control and prevention. The report offers a comprehensive framework on multiple and interrelated influences on STI risk, prevention, health care access, delivery, and treatment. It also provides an overview of the multilevel risk and protective factors associated with STIs that could be applied using a sexual health paradigm. The military context must integrate the multilevel domains of influences to guide the effort to fill current gaps and research needs. The Department of Defense, with its large clinical and preventive medicine workforce and its well-established universal health care system, is well positioned to enact changes to shift its current approach to STI prevention, treatment, and control. STI control based on highlighting behavioral, social, cultural, and environmental influences on service members' sexual health and wellness may well drive better STI care and prevention outcomes.

Military and Civilian Sector Practice Patterns for Short-Term Travelers' Diarrhea Self-Treatment in Adults.

The Deployment and Travel Medicine Knowledge, Attitude, Practice and Outcomes Study investigates the various clinician and traveler contributions to medical outcomes within the U.S. Military Health System. Travelers' diarrhea is among the most common travel-related illnesses, making travelers' diarrhea self-treatment (TDST) important for traveler health. A cohort of 80,214 adult travelers receiving malaria chemoprophylaxis for less than 6 weeks of travel were identified within the U.S. Department of Defense Military Health System Data Repository. Associated prescriptions for TDST medications within 2 weeks of chemoprophylaxis prescriptions were identified. Prescription patterns were compared by service member versus beneficiary status and site of care, military facility versus civilian facility. At military facilities, medical provider demographics were analyzed by clinical specialty and categorized as travel medicine specialists versus nonspecialists. Overall, there was low prescribing of TDST, particularly among civilian providers and military nonspecialists, despite guidelines recommending self-treatment of moderate to severe travelers' diarrhea. This practice gap was largest among service member travelers, but also existed for beneficiaries. Compared with nonspecialists, military travel medicine specialists were more likely to prescribe a combination of an antibiotic and antimotility agent to beneficiaries, more likely to provide any form of TDST to service members, and more likely to prescribe azithromycin than quinolones when using antibiotics. Our study suggests that enhancing provider knowledge and use of travelers' diarrhea treatment recommendations combined with improved access to formal travel medicine services may be important to increase the quality of care.

Associations of gender identity with sexual behaviours, social stigma and sexually transmitted infections among adults who have sex with men in Abuja and Lagos, Nigeria.

INTRODUCTION: Sexual and gender minority populations are disproportionately affected by the global syndemic of HIV and other sexually transmitted infections (STIs). We hypothesized that transgender women (TGW) and non-binary individuals in Nigeria have more STIs than cis-gender men who have sex with men (cis-MSM), and that experiences of stigma and sexual practices differ between these three groups. METHODS: From 2013 to 2020, TRUST/RV368 enrolled adults assigned male sex at birth who reported anal sex with men in Abuja and Lagos, Nigeria. Participants were tested for STIs and completed questionnaires about sexual behaviours and social stigma every 3 months. Participants were categorized as cis-MSM, TGW or non-binary/other based on self-reported gender identity. Gender group comparisons were made of HIV, gonorrhoea and chlamydia prevalence and incidence; stigma indicators; and condom use during anal sex. RESULTS: Among 2795 participants, there were 2260 (80.8%) cis-MSM, 284 (10.2%) TGW and 251 (9.0%) non-binary/other individuals with median age of 23 years (interquartile range 20-27). HIV prevalence among cis-MSM, TGW and non-binary/other participants was 40.8%, 51.5% and 47.6%, respectively (p = 0.002). HIV incidence was 8.7 cases per 100 person-years (PY) (95% confidence interval [CI] 6.9-10.8), 13.1 cases/100 PY (95% CI 6.5-23.4) and 17.6 cases/100 PY (95% CI 9.8-29.0, p = 0.025), respectively. Anorectal gonorrhoea incidence was lower in cis-MSM than TGW (22.2 [95% CI 19.6-25.0] vs. 35.9 [95% CI 27.3-46.3]). TGW were more likely than cis-MSM to report being affected by stigma, including assault (47.2% vs. 32.3%), fear of walking around (32.4% vs. 19.2%) and healthcare avoidance (25.0% vs. 19.1%; all p < 0.05). TGW were more likely to report always using condoms than non-binary/other individuals (35.3% vs. 26.2%, p = 0.041) during receptive anal sex. CONCLUSIONS: Sexual and gender minorities in Nigeria have heterogeneous sexual behaviours and experiences of social stigma that may influence the vulnerability to HIV and other STIs. There is a need for tailored interventions that acknowledge and are informed by gender. Further research is needed, particularly among understudied non-binary individuals, to better understand disparities and inform tailored interventions to improve outcomes among these communities.

Identifying Nontraditional Epidemic Disease Risk Factors Associated with Major Health Events from World Health Organization and World Bank Open Data.

Health events emerge from host, community, environment, and pathogen factors-forecasting epidemics is a complex task. We describe an exploratory analysis to identify economic risk factors that could aid epidemic risk assessment. A line list was constructed using the World Health Organization Disease Outbreak News (2016-2018) and economic indicators from the World Bank. Poisson regression employing forward imputations was used to establish relationships with the frequency with which countries reported public health events. Economic indicators demonstrated strong performance appropriate for further assessment in surveillance programming. In our analysis, three economic indicators were significantly associated to event reporting: how much the country's urban population changed, its average forest area, and a novel economic indicator we developed that assessed how much the gross domestic product changed per capita. Other economic indicators performed less well: changes in total, female, urban, and rural population sizes; population density; net migration; change in per cent forest area; total forest area; and another novel indicator, change in percent of trade as a fraction of the total economy. We then undertook a further analysis of the start of the current COVID-19 pandemic that revealed similar associations, but confounding by global disease burden is likely. Continued development of forecasting approaches capturing information relevant to whole-of-society factors (e.g., economic factors as assessed in our study) could improve the risk management process through earlier hazard identification and inform strategic decision processes in multisectoral strategies to preventing, detecting, and responding to pandemic-threat events.

Biomedical Response to Neisseria gonorrhoeae and Other Sexually Transmitted Infections in the US Military.

INTRODUCTION: Sexually transmitted infections (STIs) continue to plague militaries and defense forces. While the historical recognition of the impact of STIs on operations is evident, contemporary surveillance and research activities are limited. As Neisseria gonorrhoeae and other sexually transmitted pathogens become increasingly resistant to antibiotics, the role of the Department of Defense (DoD) in disease surveillance and clinical research is essential to military Force Health Protection. METHODS: The Infectious Disease Clinical Research Program (IDCRP) of the Uniformed Services University of the Health Sciences partnered with the DoD Global Emerging Infections Surveillance (GEIS) program to monitor the distribution of gonorrhea antimicrobial resistance (AMR) both domestically and abroad. The DoD gonococcal reference laboratory and repository was established in 2011 as a resource for confirmatory testing and advanced characterization of isolates collected from sites across the continental United States (CONUS) and GEIS-funded sites outside the continental United States (OCONUS). The IDCRP is currently implementing surveillance efforts at CONUS military clinics, including Madigan Army Medical Center, Naval Medical Center Camp Lejeune, Naval Medical Center Portsmouth, Naval Medical Center San Diego, and San Antonio Military Medical Center (efforts were also previously at Womack Army Medical Center). The reference laboratory and repository receives specimens from OCONUS collaborators, including Armed Forces Research Institute of Medical Sciences (AFRIMS; Bangkok, Thailand), Naval Medical Research Unit No. 3 (NAMRU-3), Ghana Detachment (Accra, Ghana), Naval Medical Research Unit No. 6 (NAMRU-6; Lima, Peru), U.S. Army Medical Research Unit - Georgia (USAMRD-G; Tbilisi, Republic of Georgia), and U.S. Army Medical Research Directorate - Kenya (USAMRD-K; Nairobi, Kenya). The gonococcal surveillance program, to include findings, as well as associated clinical research efforts are described. RESULTS: Among N. gonorrhoeae isolates tested within the United States, 8% were resistant to tetracycline, 2% were resistant to penicillin, and 30% were resistant to ciprofloxacin. To date, only one of the 61 isolates has demonstrated some resistance (MIC=1 µg/ml) to azithromycin. No resistance to cephalosporins has been detected; however, reduced susceptibility (MIC=0.06-0.125 µg/ml) has been observed in 13% of isolates. Resistance is commonly observed in N. gonorrhoeae isolates submitted from OCONUS clinical sites, particularly with respect to tetracycline, penicillin, and ciprofloxacin. While no azithromycin-resistant isolates have been identified from OCONUS sites, reduced susceptibility (MIC=0.125-0.5 µg/ml) to azithromycin was observed in 23% of isolates. CONCLUSION: Continued monitoring of circulating resistance patterns on a global scale is critical for ensuring appropriate treatments are prescribed for service members that may be infected in the U.S. or while deployed. Domestic surveillance for gonococcal AMR within the Military Health System has indicated that resistance patterns, while variable, are not dramatically different from what is seen in U.S. civilian data. Global patterns of gonococcal AMR have been described through the establishment of a central DoD gonococcal reference laboratory and repository. This repository of global isolates provides a platform for further research and development into biomedical countermeasures against gonococcal infections.

Extragenital chlamydia infection among active-duty women in the United States Navy.

BACKGROUND: Pharyngeal and anorectal reservoirs of gonorrhea (GC) and chlamydia (CT) are increasingly recognized among heterosexual women. While a number of studies performed at sexually transmitted disease (STD) clinics have found a high prevalence of extragenital GC/CT infection, such screening is typically not offered during routine primary care visits for women. We sought to define the prevalence of and factors associated with extragenital GC/CT among women in the U.S. Navy. METHODS: We recruited servicewomen stationed in San Diego, California, between the ages of 18 and 25 who presented for an annual physical exam between January and September, 2017. Nucleic acid amplification testing was performed on swabs collected at endocervical, oropharyngeal and anorectal sites to assess the presence of GC/CT. An anonymous behavioral questionnaire was also administered to characterize sexual risk. Descriptive statistics were used to compare women with and without a prior history of any sexually transmitted infection (STI) (self-report) along with a current GC/CT diagnosis. This study was approved by the Institutional Review Board of the Uniformed Services University of Health Sciences. RESULTS: Of the 75 patients who were approached, 60 subjects were enrolled in the study, including white 20 (33.3%), black/African American 18 (31.0%), Hispanic/Latina 13 (21.7%) and Asian/Pacific Islander 9 (15.5%) women. Among all the women, six (10.0%) were diagnosed with CT infection, all via endocervical exam. Of these, five (8.3%) had concurrent anorectal infection, including two cases (3.3%) accompanied by pharyngeal infection. Of the subjects, 15 (25.0%) reported anal intercourse in their most recent sexual encounter, most of which was condomless (13/15, 86.7%). A high number of women who reported sex with a casual male partner (19/45, 42.2%) reported rarely or never using condoms; last, 41.7% consuming at least 3 drinks on a typical drinking day, and one-third of the reported drinking more than once per week. CONCLUSIONS: We found a high prevalence of anorectal CT infection, although no infections were detected without concurrent endocervical involvement. Nonetheless, the high prevalence of condomless anal intercourse reported by participants argues for further study and ongoing consideration of extragenital screening among high-risk patients. Behavioral interventions are also warranted given the high prevalence of sexual and related risk factors.

Rates of Chlamydia trachomatis infections across the deployment cycle, active component, U.S. Armed Forces, 2008-2015.

High rates of sexually transmitted infections (STIs), including Chlamydia trachomatis (CT), have been documented among U.S. military service members. However, it is unknown whether phases of the deployment cycle affect risk for CT. This article characterizes the rates of CT infections during the predeployment, deployment, and post-deployment phases for active component members of the U.S. Army, Navy, Air Force, and Marine Corps during 2008-2015. Cases of CT were defined using laboratory, reportable medical event, and prescription data in a sensitivity analysis approach. Adjusted incidence rate ratios for CT were calculated using a multivariable Poisson model. In these analyses, the crude and adjusted incidence rates of CT were found to be highest during the pre-deployment phase for both sexes. However, men's rates of CT differed only slightly across pre-, post-, and non-deployed phases, while women had substantial rate differences between phases. These analyses call for better screening and documentation of STIs during deployment, as well as continued surveillance of STIs in the Military Health System, to assess the true burden of disease.