Capnography access and use in Kenya and Ethiopia

PURPOSE

Lack of access to safe and affordable anesthesia and monitoring equipment may contribute to higher rates of morbidity and mortality in low- and middle-income countries (LMICs). While capnography is standard in high-income countries, use in LMICs is not well studied. We evaluated the association of capnography use with patient and procedure-related characteristics, as well as the association of capnography use and mortality in a cohort of patients from Kenya and Ethiopia.

METHODS

For this retrospective observational study, we used historical cohort data from Kenya and Ethiopia from 2014 to 2020. Logistic regression was used to study the association of capnography use (primary outcome) with patient/procedure factors, and the adjusted association of intraoperative, 24-hr, and seven-day mortality (secondary outcomes) with capnography use.

RESULTS

A total of 61,792 anesthetic cases were included in this study. Tertiary or secondary hospital type (compared with primary) was strongly associated with use of capnography (odds ratio [OR], 6.27; 95% confidence interval [CI], 5.67 to 6.93 and OR, 6.88; 95% CI, 6.40 to 7.40, respectively), as was general (vs regional) anesthesia (OR, 4.83; 95% CI, 4.41 to 5.28). Capnography use was significantly associated with lower odds of intraoperative mortality in patients who underwent general anesthesia (OR, 0.31; 95% CI, 0.17 to 0.48). Nevertheless, fully-adjusted models for 24-hr and seven-day mortality showed no evidence of association with capnography.

CONCLUSION

Capnography use in LMICs is substantially lower compared with other standard anesthesia monitors. Capnography was used at higher rates in tertiary centres and with patients undergoing general anesthesia. While this study revealed decreased odds of intraoperative mortality with capnography use, further studies need to confirm these findings.

Capnography-An Essential Monitor, Everywhere: A Narrative Review

Capnography is now recognized as an indispensable patient safety monitor. Evidence suggests that its use improves outcomes in operating rooms, intensive care units, and emergency departments, as well as in sedation suites, in postanesthesia recovery units, and on general postsurgical wards. Capnography can accurately and rapidly detect respiratory, circulatory, and metabolic derangements. In addition to being useful for diagnosing and managing esophageal intubation, capnography provides crucial information when used for monitoring airway patency and hypoventilation in patients without instrumented airways. Despite its ubiquitous use in high-income-country operating rooms, deaths from esophageal intubations continue to occur in these contexts due to incorrect use or interpretation of capnography. National and international society guidelines on airway management mandate capnography's use during intubations across all hospital areas, and recommend it when ventilation may be impaired, such as during procedural sedation. Nevertheless, capnography's use across high-income-country intensive care units, emergency departments, and postanesthesia recovery units remains inconsistent. While capnography is universally used in high-income-country operating rooms, it remains largely unavailable to anesthesia providers in low- and middle-income countries. This lack of access to capnography likely contributes to more frequent and serious airway events and higher rates of perioperative mortality in low- and middle-income countries. New capnography equipment, which overcomes cost and context barriers, has recently been developed. Increasing access to capnography in low- and middle-income countries must occur to improve patient outcomes and expand universal health care. It is time to extend capnography's safety benefits to all patients, everywhere.

Perioperative implications of patients with alpha gal allergies

Alpha Gal Syndrome (AGS) is an emerging immune response to mammalian products (MP) containing the oligosaccharide galactose-α-1,3 galactose (α-Gal) which includes meats and inactive ingredients in certain medications. This becomes clinically important in the perioperative realm as MPs are commonly found in the operating room, and pre- and post-operative settings, and can trigger responses as severe as anaphylaxis. In this review, authors discuss the epidemiology, diagnosis and treatment of AGS reactions. Additionally, strategies are explored in order to screen and prevent exposure to MP with a multidisciplinary approach. While this emerging allergy is still not fully understood, it is of paramount importance that all anesthesia providers recognize the implications of MP exposure in AGS patients and ultimately prevent harm in this highly vulnerable population.

Impact of capnography on patient safety in high- and low-income settings: a scoping review

BACKGROUND

Capnography is universally accepted as an essential patient safety monitor in high-income countries (HICs) yet is often unavailable in low and middle-income countries (LMICs). Increasing capnography availability has been proposed as one of many potential approaches to improving perioperative outcomes in LMICs. This scoping review summarises the existing literature on the effect of capnography on patient outcomes to help prioritise interventions and guide expansion of capnography in LMICs.

METHODS

We searched MEDLINE and EMBASE databases for articles published between 1980 and March 2019. Studies that assessed the impact of capnography on morbidity, mortality, or the use of airway interventions both inside and outside the operating room were included.

RESULTS

The search resulted in 7445 unique papers, and 31 were included for analysis. Retrospective and non-randomised data suggest capnography use may improve outcomes in the operating room, ICU, and emergency department, and during resuscitation. Prospective data on capnography use for procedural sedation suggest earlier detection of hypoventilation and a reduction in haemoglobin desaturation events. No randomised studies exist that assess the impact of capnography on patient outcomes.

CONCLUSION

Despite widespread endorsement of capnography as a mandatory perioperative monitor, rigorous data demonstrating its impact on patient outcomes are limited, especially in LMICs. The association between capnography use and a reduction in serious airway complications suggests that closing the capnography gap in LMICs may represent a significant opportunity to improve patient safety. Additional data are needed to quantify the global capnography gap and better understand the barriers to capnography scale-up in LMICs.

Childhood Abuse and Intimate Partner Violence Victimization Among Filipina and South Asian Women in the United States

Background: Intimate partner violence (IPV) is a common form of interpersonal violence and impacts the health and well-being of victims over their lifetime. Many victims of IPV experience multiple types of victimization throughout their lives, often starting in childhood. The prevalence of IPV victimization of women varies among different race/ethnic groups. The purpose of this project is to examine childhood abuse among Filipina and South Asian women living in the United States who had experienced IPV. Methods: Data were extracted from Lifecourse Experiences of Intimate Partner Violence and Help-Seeking among Filipina, Indian, and Pakistani Women: Implications for Justice System Responses 2007-2009 (San Francisco, CA) (ICPSR 29682). Data were collected from 143 women (87 Filipina and 56 South Asian (i.e., Indian or Pakistani) aged between 18 and 60 years who had been a victim of IPV and lived in the United States. Results: Although both Filipina and South Asian women who had experienced IPV reported a high prevalence of childhood abuse, Filipina women reported a higher prevalence than South Asian women. South Asian women were more likely to have first experienced IPV at a younger age and sought some form of IPV services as compared with Filipina women. The factors associated with experiencing all the types of IPV victimization included younger age at the first physical IPV victimization experience and higher educational attainment. Conclusions: Future research should examine the cumulative victimization of childhood abuse and IPV among Asian populations and its impact on health.

Addressing Supply Chain Management Issues in Cost-effective Maternal and Pediatric Global Surgery: A Call to Action

Persistent global disparities in maternal and neonatal outcomes exist, in part, due to a lack of access to safe surgery. This commentary examines the relative need for increased focus on access to safe maternal and pediatric surgery globally, starting with a focus on cost-effective surgeries. There is a need to understand context-specific surgeries for regions, including understanding regional versus tertiary development. Most important is a need to understand the crucial role of supply chain management (SCM) in developing better access to maternal and pediatric surgery in limited resource settings. We evaluate the role of SCM in global surgery and global health, and the current landscape of inefficiency. We outline specific findings and takeaways from recent solutions developed in pediatric and maternal surgery to address SCM inefficiencies. We then examine the applicability to other settings and look at the future. Our goal is to summarize the challenges that exist today in a global setting to provide better access to maternal and pediatric surgery and outline solutions relying on structural, SCM-related framework.

Health and Well-being of Women Migrating from Predominantly Muslim Countries to the United States

The purpose of this study was to examine the health and well-being of women migrating from predominantly Muslim countries to the U.S. Women from predominantly Muslim countries completed a paper survey on the following topics from June to December in 2016 (N=102): depression; physical functioning; self-reported general health; experiences with health care; and demographic characteristics. There were several women's health-related issues: low rates for mammography and Pap smear screening, and preference for female physicians and/or physicians from the same culture. Only one-third of the participants had received a physical exam in the past year, and having done so was related to higher levels of depression and worse physical functioning. The participants who were not in a refugee camp reported higher levels of depression than those who were.

Retained foreign bodies and associated risk factors and outcomes in pediatric surgical patients

BACKGROUND

Retained foreign bodies discovered after surgery are documented as Agency for Health Care Quality and Research Patient Safety Indicators. Our goal was to identify pediatric patient and procedure risk factors and outcomes associated with RFB based on AHRQ Definitions.

METHODS

We performed a retrospective case-control study of children with RFB using the PHIS database. Patients were defined as having RFB based on the AHRQ PSI definition. Controls were matched in a 5:1 ratio on age, procedure date, and hospital. Our primary outcome was the presence of RFB. Secondary outcomes included hospital length of stay and mortality.

RESULTS

Patients with RFB often underwent emergent procedures, experienced one or more chronic conditions, and required ICU admission or mechanical ventilation. Musculoskeletal procedures contribute the largest numbers of RFB (30.4%), but interventional radiology procedures had higher odds of having RFB (AOR 7.88, p < 0.0001). After multivariate adjustment, children with RFB required 4 more days of hospitalization (p < .001), but there was no difference in mortality (p = .579).

CONCLUSIONS

The implications of our study include identifying which administrative flags can be used to identify children at higher risks for RFB. Early identification of at-risk patients and prevention are key towards addressing the primary problem and corresponding sequela of RFB.

LEVELS OF EVIDENCE

Prognostic Study Level III.

Beliefs and knowledge of cardiovascular-related disease among uninsured primary care patients: A cross-sectional study

OBJECTIVE

The purpose of this study was to examine cardiovascular disease-related health beliefs and how they are influenced by knowledge and a sense of community among uninsured primary care patients.

METHOD

This study was a cross-sectional study using a self-administered paper survey (January to April 2016). The study population included medically uninsured US-born English speakers, non-US-born English speakers, and Spanish speakers.

RESULTS

Medically uninsured adults utilizing a free clinic (N = 374) participated in the survey. Increasing knowledge about major risk factors for developing cardiovascular disease helped enhance levels of perceived severity of cardiovascular disease and benefits of healthy diet and physical activity. Spanish speakers reported higher levels of perceived severity of cardiovascular disease but lower levels of knowledge compared to US-born or non-US-born English speakers.

CONCLUSION

Spanish speakers may need different approaches to promote cardiovascular disease prevention due to their higher levels of perceived severity of cardiovascular disease but lower levels of cardiovascular disease-related knowledge compared to English speakers. Developing a healthy "community" in a clinic setting may be effective to promote cardiovascular disease-related health for underserved populations.

Investigating Capnography Innovation for Better Patient Monitoring in the Resource Limited Surgical Setting

BACKGROUND

Access to basic anesthetic monitoring in the developing world is lacking, which contributes to the 100 times greater anesthesia-related mortality in low- and middle-income countries. We hypothesize that an environmental sensor with a lower sampling rate could provide some clinical utility by providing CO₂ levels, respiratory rate, and support in detection of clinical abnormalities.

MATERIALS AND METHODS

A bench-top lung simulation was created to replicate CO₂ waveforms, and an environmental sensor was compared with industry-available technology. Sensor response time and respiratory rates were compared between devices. Additionally, an in silico model was created to replicate capnography pathology as waveforms would appear using the environmental sensor.

RESULTS AND CONCLUSION

Breath simulations using the bench-top lung simulation produced similar results to industry standards with a degree of variability. Respiratory rates did not differ between the environmental sensor and all other devices tested. Finally, pathological waveforms created in silico carried a certain level of detail regarding ventilatory pathology, which could provide some clinical insight to an anesthesiologist. We believe our prototype is the first step toward making low-cost and portable capnography available in the resource-limited setting, and future efforts should focus on bridging the gap to safer anesthesia and surgery globally.

Clearance of tunneled central venous catheter associated blood stream infections in children

BACKGROUND

The optimal time to reinsert central venous catheters (tCVC) after a documented central line associated blood stream infection (CLABSI) is unclear. The goal of this study is to identify risk factors for children who develop persistent bacteremia after tCVC removal due to CLABSI.

METHODS

We performed a retrospective cohort study from a tertiary children's hospital. Children who underwent removal of a tCVC due to CLABSI were included in our analysis. Our primary outcome was persistent bacteremia after tCVC removal defined by a persistently positive blood culture. Salient patient demographic and clinical factors were extracted from the medical record.

RESULTS

A total of 140 patients met inclusion criteria and 27 (19%) had a persistent CLABSI after removal of the tCVC. There were no significant differences between the patients who cleared their bacteremia and those who develop persistent bacteremia. The median (IQR) time to positive blood culture after tCVC removal was 2.7 days (1.7- 4.0).

CONCLUSIONS

We did not identify any patient risk factors distinguishing between a child who will clear a CLABSI versus develop a persistent CLABSI after tCVC removal. Blood stream infection clearance was rapid after tCVC removal, supporting a brief line holiday prior to tCVC reinsertion.

LEVEL OF EVIDENCE

Level III Retrospective Case-Control Study.

Knowledge and beliefs about HPV among college students in Vietnam and the United States

Any sexually active person has the possibility of contracting the human papillomavirus (HPV) sometime in their lifetime. HPV vaccines are effective in preventing HPV if obtained prior to viral exposure. Research on knowledge and beliefs of HPV and HPV vaccination among college students in Vietnam is significantly scarce. The purpose of this study is to examine the knowledge and beliefs about HPV among college students in Vietnam compared to college students in the US. This cross-cultural comparison will fill a void in current research on this subject. Over 900 college students (N=932: n=495 in Vietnam and n=437 in the US) participated in a self-administered survey on the knowledge and beliefs about HPV in September and October 2016. Vietnamese participants reported lower levels of knowledge and experiences with the HPV virus and vaccines (p<0.01). Additionally, Vietnamese participants also exhibited more barriers in obtaining the vaccination, as well as, HPV risk denial (p<0.01). The level of knowledge is an important predictor of barriers (p<0.01; η_p²=0.022) and risk denial (p<0.01; η_p²=0.116). On average, both Vietnamese and US participants could correctly answer less than half of the survey questions regarding HPV knowledge. Additionally, provider recommendations are potentially more important than informal connections (e.g. friends, family) to reduce barriers to HPV vaccination (p<0.01; η_p²=0.035) and denial of HPV risks (p<0.05; η_p²=0.008). The increase of knowledge about HPV prevention, including and vaccination, has the potential to be improved through provider interventions. Vietnam could take action toward promoting HPV vaccinations not only at an individual level but also at a national or local level. Further research may examine the effects of a lack of knowledge on HPV-related health outcomes.

Knowledge and Perceptions of Influenza Vaccinations Among College Students in Vietnam and the United States

Objectives

Influenza is a significant worldwide public health issue. Knowledge and perceptions regarding the flu vaccination are associated with whether individuals obtain the vaccination. The purpose of this study was to examine how such perceptions were related to knowledge and self-efficacy regarding influenza and the flu vaccination in Vietnam and the US.

Methods

College students (n=932) in Vietnam (n=495) and the US (n=437) completed a self-administered survey regarding knowledge and perceptions of influenza vaccinations in September and October 2016.

Results

Vietnamese participants reported significantly lower levels of awareness about flu risk, higher levels of negative attitudes toward flu vaccination, lower levels of knowledge about the flu and vaccination, and lower levels of self-efficacy than US participants. Higher levels of flu and flu vaccination knowledge and self-efficacy regarding general responsible health practices were associated with lower levels of negative perceptions of flu risk and attitudes toward vaccination. At the same time, self-efficacy regarding responsible health practices was associated with higher levels of awareness of flu risk and lower levels of negative attitudes toward vaccination. Self-efficacy regarding exercise was associated with lower levels of perceptions of flu risk and higher levels of negative attitudes toward vaccination.

Conclusions

Vietnam could benefit from influenza education based on this comparison with the US. In both countries, knowledge and self-efficacy were found to be important factors influencing perceptions of influenza risk and vaccination.

Prevention and Management of Hypertension and Diabetes Using Social Capital and Physical Activity Among Socioeconomically Disadvantaged Populations

The purpose of this study is to examine the association between physical activity adherence and social capital among uninsured primary care patients with or without hypertension and/or diabetes. Uninsured adults using a free clinic (N = 374) participated in a self-administered survey from January to April in 2016. The percentage of participants who were adherent to physical activity was low regardless of having hypertension and/or diabetes, or not. Individuals who reported a high sense of community were associated with a higher percentage of physical activity adherence. Good weight management was associated with less likelihood of physical activity adherence.

Perceived benefits and barriers and self-efficacy affecting the attendance of health education programs among uninsured primary care patients

Lifestyle interventions have shown to be effective in improving health status, health behaviors, and self-efficacy. However, recruiting participants to health education programs and ensuring the continuity of health education for underserved populations is often challenging. The goals of this study are: to describe the attendance of health education programs; to identify stages of change to a healthy lifestyle; to determine cues to action; and to specify factors affecting perceived benefits and barriers to healthy food choices and physical activity among uninsured primary care patients. Uninsured primary care patients utilizing a free clinic (N=621) completed a self-administered survey from September to December of 2015. US born English speakers, non-US born English speakers, and Spanish speakers reported different kinds of cues to action in attending health education programs. While self-efficacy increases perceived benefits and decreases perceived barriers for physical activity, it increases both perceived benefits and perceived barriers for healthy food choices. The participants who had attended health education programs did not believe that there were benefits for healthy food choices and physical activity. This study adds to the body of literature on health education for underserved populations.

Mycoplasma superantigen enhances the severity of K/BxN autoimmune arthritis through TLR4/BCL6/TFH pathway

Mycoplasma arthritidis mitogen (MAM), a potent superantigen (SAg) secreted by M. arthritidis, is known to contribute to mouse inflammatory/autoimmune arthritis. We previously demonstrated that C3H mouse strains differing in expression of TLR4, also differ in Th-1 versus Th-2 and Th17 cytokine profiles in response to MAM due to a differential engagement of TLR2 and TLR4. HMGB-1, a member of heat shock protein family that is abundantly expressed in many cell types upon activation, has been implicated in regulating TLR signaling pathways following its interaction with RAGE. In the present study, we established a new model of mouse arthritis induced by injection of K/BxN sera. Also, we provide evidence that HMGB1 is an essential endogenous activator of the immune response in K/BxN-sera transfer BALB/c mice following MAM immunization. Level of HMGB1 expression was promptly increased in K/BxN sera-transferred mice after MAM injection. The increase in HMGB1 was required for initiation of MAM-induced enhancement of BCL-6, type I interferon (IFN) and follicular helper T cell responses. Blockade of HMGB1 caused prolonged activation of BCL-6 pathways, reduced level of type I IFN and augmented production of IL-10. Also, MAM-immunized K/BxN mice injected with HMGB1 antibody were less susceptible to arthritis suggesting HMGB1 may accomplish this mainly through its interaction with TLR4. Thus, HMGB1, in synergy with mycoplasma superantigen MAM, functions as biologically important modulators of TLR4/BCL6/TFH, and thus the targeting of this pathway can be a useful therapeutic strategy for treating human rheumatoid arthritis.

Intimate partner violence-related experiences and mental health among college students in Japan, Singapore, South Korea and Taiwan

BACKGROUND

Intimate partner violence (IPV) is a significant public health threat that contributes to a wide range of mental and physical health problems for victims.

AIMS

The purpose of this study was to examine IPV-related experiences and mental health outcomes among college students in Japan, Singapore, South Korea and Taiwan.

METHODS

The data were obtained from the Inter-University Consortium for Political and Social Research (ICPSR), the International Dating Violence Study (IDVS) 2001-2006 (ICPSR 29583; N = 981; Japan n = 207; Singapore n = 260; South Korea n = 256; Taiwan n = 258).

RESULTS

Co-experience of physical IPV victimization and perpetration was associated with borderline personality traits and posttraumatic stress disorder (PTSD), but not with depression. Childhood sexual abuse, gender hostility and violence socialization were significant predictors of borderline personality traits, depression and PTSD. While country and gender variations in mental health are noted, there are two specific populations that may need special attention for mental health interventions: Taiwanese women especially for borderline personality traits and PTSD, and Japanese men especially for depression.

CONCLUSION

IPV victimization and perpetration, childhood sexual abuse, gender hostility and violence socialization have a significant impact on the mental health of college students in Japan, Singapore, South Korea and Taiwan. Since IPV and mental health are significant public health issues, research on IPV and mental health consequences of IPV victimization and perpetration in these countries should be further expanded in order to better understand the interventions that will be effective in treating victims, perpetrators and victim/perpetrators of IPV.

Food Insecurity Associated with Self-Efficacy and Acculturation

Food insecurity is a significant public health issue that affects the physical and mental health of people of all ages. Higher levels of self-efficacy may reduce levels of food insecurity. In addition, acculturation is potentially an important factor for food insecurity among immigrant populations. The purpose of this study is to examine food insecurity associated with self-efficacy and acculturation among low-income primary care patients in the United States. A self-administered survey was administered in May and June 2015 to uninsured primary care patients (N = 551) utilizing a free clinic that provides free primary care services to low-income uninsured individuals and families in the United States. On average, participants reported low food security. Higher levels of self-efficacy were associated with lower levels of food insecurity. Higher levels of heritage language proficiency were related to lower levels of food insecurity. US-born English speakers, women, and unmarried individuals potentially have higher risks of food insecurity and may need interventions to meet their specific needs. Self-efficacy should be included in nutrition education programs to reduce the levels of food insecurity. Future studies should further examine why these groups have a high risk to better understand needs for interventions.

The association between tobacco, alcohol, and drug use, stress, and depression among uninsured free clinic patients: U.S.-born English speakers, non-U.S.-born English speakers, and Spanish speakers

The abuse of substances is a significant public health issue. Perceived stress and depression have been found to be related to the abuse of substances. The purpose of this study is to examine the prevalence of substance use (i.e., alcohol problems, smoking, and drug use) and the association between substance use, perceived stress, and depression among free clinic patients. Patients completed a self-administered survey in 2015 (N = 504). The overall prevalence of substance use among free clinic patients was not high compared to the U.S. general population. U.S.-born English speakers reported a higher prevalence rate of tobacco smoking and drug use than did non-U.S.-born English speakers and Spanish speakers. Alcohol problems and smoking were significantly related to higher levels of perceived stress and depression. Substance use prevention and education should be included in general health education programs. U.S.-born English speakers would need additional attention. Mental health intervention would be essential to prevention and intervention.

Stress, Coping Strategies, and Depression--Uninsured Primary Care Patients

OBJECTIVES

People of low socio-economic status (SES) are particularly at risk for developing stress-related conditions. The purpose of this study is to examine depression, stress, and coping strategies among uninsured primary care patients who live below the 150th percentile of the federal poverty level. Specifically, this study compares the experiences of impoverished US-born English speakers, non-US-born English speakers, and Spanish speakers.

METHODS

Uninsured primary care patients utilizing a free clinic (N = 491) completed a self-administered survey using standardized measures of depression, perceived stress, and coping strategies in the spring of 2015.

RESULTS

US-born English speakers reported higher levels of depression and perceived stress compared to non-US-born English speakers and Spanish speakers. US-born English speakers are more likely to use negative coping strategies than non-US-born English speakers and Spanish speakers. Perceived stress and negative coping strategies are significant predictors of depression.

CONCLUSION

US-born English speakers, non-US-born English speakers, and Spanish speakers reported different coping strategies, and therefore, may have different needs for addressing depression. In particular, US-born English speakers need interventions for reducing substance use and negative psychological coping strategies.

Satisfaction with healthcare services among free clinic patients

Free clinics provide free or reduced fee health services to the un- or under-insured. Patient engagement is important to understand patients' needs and to improve healthcare systems. There are few studies that examined patient engagement and satisfaction among the underserved and how patients perceive the quality of healthcare services in a free clinic setting. This study examined free clinic patients' satisfaction in order to better understand how free clinic patients perceive quality of healthcare services. English or Spanish speaking patients (N = 351), aged 18 years or older completed a self-administered survey using standardized measures of patient satisfaction and health status. Additional questions of patient satisfaction and experience with healthcare which fit a free clinic setting were developed. While the satisfaction with interpreter services was overall high, there were potential issues of a family member as an interpreter and unmet needs for interpreter services. Participants reported different levels of patient satisfaction by three language categories: native English speakers, non-native English speakers, and Spanish speakers. Health status is an important indicator to determine patient satisfaction. To improve patient satisfaction and engagement among free clinic patients, factors such as: quality of a family interpreter, unmet needs for interpreter services, social support, and health education programs may need to be considered. The differences in these three language groups indicate that not all free clinic patients may be combined together into a general category of free clinic patients. It may be necessary to provide customized treatment for each of these groups.

Mycoplasma superantigen initiates a TLR4-dependent Th17 cascade that enhances arthritis after blocking B7-1 in Mycoplasma arthritidis-infected mice

Mycoplasma arthritidis is a natural pathogen of rodents causing arthritis, toxic shock and necrotizing fasciitis. It secretes a potent superantigen (SAg), MAM, that differentially affects the immune system depending upon presence or absence of TLR4, thus potentially influencing disease outcomes. Here, we establish that antibody to co-stimulatory molecule B7-1(CD80) enhances arthritis in wild-type C3H/HeSnJ (TLR2+4+) mice but suppresses arthritis in TLR4-defect C3H/HeJ (TLR2+4-) mice. Also, blockade of the B7-1/CD28 co-stimulatory pathway in C3H/HeSnJ mice resulted in a marked increase in an alternative co-stimulatory pathway ICOS/ICOSL that was associated with elevation of the IL-17/Th17cascade with enhanced IL-23, IL-6, and the RORγt and STAT3 transcriptional factors on CD4+ T cells. Anti- B7-1 also increased inflammatory chemokines and the stress protein HMGB1 that promotes cellular infiltration to joints. Using a MAM-deficient strain of M. arthritidis, a monoclonal antibody to TLR4 and a TLR4-defective mouse strain, we established that both MAM and TLR4 are required for the systemic and local joint triggering of the Th17/IL-17 cascade in mice treated with anti-B7-1 antibody. Importantly, blocking of IL-17 with anti-IL-17 antibody suppressed the elevated arthritis in M. arthritidis-infected mice treated with anti-B7-1 antibody. Thus, this unique model of arthritis illustrates how microbial agonists can bridgeinnate and adaptive immune responses to redirect signalling pathways, thus promoting chronic inflammatory and autoimmune disease.