Single Cell High Dimensional Analysis of Human Peripheral Blood Mononuclear Cells Reveals Unique Intermediate Monocyte Subsets Associated with Sex Differences in Coronary Artery Disease.

Monocytes are associated with human cardiovascular disease progression. Monocytes are segregated into three major subsets: classical (cMo), intermediate (iMo), and nonclassical (nMo). Recent studies have identified heterogeneity within each of these main monocyte classes, yet the extent to which these subsets contribute to heart disease progression is not known. Peripheral blood mononuclear cells (PBMC) were obtained from 61 human subjects within the Coronary Assessment of Virginia (CAVA) Cohort. Coronary atherosclerosis severity was quantified using the Gensini Score (GS). We employed high-dimensional single-cell transcriptome and protein methods to define how human monocytes differ in subjects with low to severe coronary artery disease. We analyzed 487 immune-related genes and 49 surface proteins at the single-cell level using Antibody-Seq (Ab-Seq). We identified six subsets of myeloid cells (cMo, iMo, nMo, plasmacytoid DC, classical DC, and DC3) at the single-cell level based on surface proteins, and we associated these subsets with coronary artery disease (CAD) incidence based on Gensini score (GS) in each subject. Only frequencies of iMo were associated with high CAD (GS > 32), adj.p = 0.024. Spearman correlation analysis with GS from each subject revealed a positive correlation with iMo frequencies (r = 0.314, p = 0.014) and further showed a robust sex-dependent positive correlation in female subjects (r = 0.663, p = 0.004). cMo frequencies did not correlate with CAD severity. Key gene pathways differed in iMo among low and high CAD subjects and between males and females. Further single-cell analysis of iMo revealed three iMo subsets in human PBMC, distinguished by the expression of HLA-DR, CXCR3, and CD206. We found that the frequency of immunoregulatory iMo_HLA-DR+CXCR3+CD206+ was associated with CAD severity (adj.p = 0.006). The immunoregulatory iMo subset positively correlated with GS in both females (r = 0.660, p = 0.004) and males (r = 0.315, p = 0.037). Cell interaction analyses identified strong interactions of iMo with CD4+ effector/memory T cells and Tregs from the same subjects. This study shows the importance of iMo in CAD progression and suggests that iMo may have important functional roles in modulating CAD risk, particularly among females.

Human CD79b+ neutrophils in the blood are associated with early-stage melanoma.

Purpose: Due to their abundance in the blood, low RNA content, and short lifespan, neutrophils have been classically considered to be one homogenous pool. However, recent work has found that mature neutrophils and neutrophil progenitors are composed of unique subsets exhibiting context-dependent functions. In this study, we ask if neutrophil heterogeneity is associated with melanoma incidence and/or disease stage. Experimental design: Using mass cytometry, we profiled melanoma patient blood for unique cell surface markers among neutrophils. Markers were tested for their predictiveness using flow cytometry data and random forest machine learning. Results: We identified CD79b+ neutrophils (CD3-CD56-CD19-Siglec8-CD203c-CD86LoCD66b+CD79b+) that are normally restricted to the bone marrow in healthy humans but appear in the blood of subjects with early-stage melanoma. Further, we found CD79b+ neutrophils present in tumors of subjects with head and neck cancer. AI-mediated machine learning analysis of neutrophils from subjects with melanoma confirmed that CD79b expression among peripheral blood neutrophils is highly important in identifying melanoma incidence. We noted that CD79b+ neutrophils possessed a neutrophilic appearance but have transcriptional and surface-marker phenotypes reminiscent of B cells. Compared to remaining blood neutrophils, CD79b+ neutrophils are primed for NETosis, express higher levels of antigen presentation-related proteins, and have an increased capacity for phagocytosis. Conclusion: Our work suggests that CD79b+ neutrophils are associated with early-stage melanoma.

Tetralogy of Fallot Presenting with Superior Vena Cava Syndrome - A Rare Presentation.

Tetralogy of Fallot (TOF) presenting with superior vena cava (SVC) syndrome is an exceedingly rare scenario. The diagnosis of this condition is still a difficult task due to its unspecific clinical features and unclear recommendations for the best diagnostic tools. We report an interesting case of a 23-year-old male who was found to have TOF with the presentation of SVC syndrome after a sequential diagnosis. The timely diagnosis helped in the successful management of the patient. Through this case, we want to make clinicians aware of such a rare association and its diagnosis.

Incorporating Tantalum Oxide Nanoparticles into Implantable Polymeric Biomedical Devices for Radiological Monitoring.

Longitudinal radiological monitoring of biomedical devices is increasingly important, driven by the risk of device failure following implantation. Polymeric devices are poorly visualized with clinical imaging, hampering efforts to use diagnostic imaging to predict failure and enable intervention. Introducing nanoparticle contrast agents into polymers is a potential method for creating radiopaque materials that can be monitored via computed tomography. However, the properties of composites may be altered with nanoparticle addition, jeopardizing device functionality. Thus, the material and biomechanical responses of model nanoparticle-doped biomedical devices (phantoms), created from 0-40 wt% tantalum oxide (TaOx ) nanoparticles in polycaprolactone and poly(lactide-co-glycolide) 85:15 and 50:50, representing non, slow, and fast degrading systems, respectively, are investigated. Phantoms degrade over 20 weeks in vitro in simulated physiological environments: healthy tissue (pH 7.4), inflammation (pH 6.5), and lysosomal conditions (pH 5.5), while radiopacity, structural stability, mechanical strength, and mass loss are monitored. The polymer matrix determines overall degradation kinetics, which increases with lower pH and higher TaOx content. Importantly, all radiopaque phantoms could be monitored for a full 20 weeks. Phantoms implanted in vivo and serially imaged demonstrate similar results. An optimal range of 5-20 wt% TaOx nanoparticles balances radiopacity requirements with implant properties, facilitating next-generation biomedical devices.

Efficacy and safety of lobeglitazone, a new Thiazolidinedione, as compared to the standard of care in type 2 diabetes mellitus: A systematic review and meta-analysis.

AIM: This systematic review and meta-analysis was conducted to evaluate the efficacy and safety of lobeglitazone as compared to the standard of care (SOC) in patients with type 2 diabetes mellitus (T2DM). METHODS: Databases were searched for relevant randomized controlled trials. The primary outcome was the comparison of the glycated hemoglobin (HbA1C) level after 24 weeks. Pooled mean differences and odds ratios were calculated using random-effects models. RESULTS: Of 267 studies that were screened, four were included. Treatment with adjunct lobeglitazone showed a reduction in the HbA1C level [mean difference: -0.23% (95% CI: -0.62 to 0.16); p = 0.24; i2: 87%; moderate GRADE (Grading of Recommendations Assessment, Development and. Evaluation) of evidence], fasting blood glucose level [mean difference: -7.12 mg/dl (95% CI: -20.09 to 5.85); p = 0.28; i2: 87%; moderate GRADE of evidence], and lipid profile as compared to those following treatment with the SOC; however, the changes were not statistically significant. The risk of hypoglycemia was significantly lower [odds ratio: 0.24 (95% CI: 0.08 to 0.70); p < 0.05; i2: 0%; moderate GRADE of evidence] without any significant difference in the risk of drug-related adverse events [odds ratio: 1.59 (95% CI: 0.87 to 2.93); p = 0.13; i2: 0%; moderate GRADE of evidence] following treatment with lobeglitazone as compared to those following treatment with the SOC. CONCLUSION: Treatment with adjunct lobeglitazone showed changes in the blood glycemic status and lipid profile similar to SOC in patients with T2DM, and the results were not statistically significant. Lobeglitazone was well tolerated; its safety profile was comparable to SOC.

Incorporating Radiopacity into Implantable Polymeric Biomedical Devices for Clinical Radiological Monitoring.

Longitudinal radiological monitoring of biomedical devices is increasingly important, driven by risk of device failure following implantation. Polymeric devices are poorly visualized with clinical imaging, hampering efforts to use diagnostic imaging to predict failure and enable intervention. Introducing nanoparticle contrast agents into polymers is a potential method for creating radiopaque materials that can be monitored via computed tomography. However, properties of composites may be altered with nanoparticle addition, jeopardizing device functionality. This, we investigated material and biomechanical response of model nanoparticle-doped biomedical devices (phantoms), created from 0-40wt% TaO x nanoparticles in polycaprolactone, poly(lactide-co-glycolide) 85:15 and 50:50, representing non-, slow and fast degrading systems, respectively. Phantoms degraded over 20 weeks in vitro, in simulated physiological environments: healthy tissue (pH 7.4), inflammation (pH 6.5), and lysosomal conditions (pH 5.5), while radiopacity, structural stability, mechanical strength and mass loss were monitored. The polymer matrix determined overall degradation kinetics, which increased with lower pH and higher TaO x content. Importantly, all radiopaque phantoms could be monitored for a full 20-weeks. Phantoms implanted in vivo and serially imaged, demonstrated similar results. An optimal range of 5-20wt% TaO x nanoparticles balanced radiopacity requirements with implant properties, facilitating next-generation biomedical devices.

Efficacy and Tolerability of Tenofovir/Lamivudine/Dolutegravir among Antiretroviral Therapy Naive Human Immunodeficiency Virus Infected Patients of a Tertiary Care Center in Eastern India.

BACKGROUND: Although many drug regimens have been used in the treatment of human immunodeficiency virus (HIV) infection, the National AIDS Control Organization (NACO) of India recommends the use of a fixed-dose combination of tenofovir/lamivudine/dolutegravir (TLD) as a first-line regimen since 2020. In spite of much global data on the use of this combination, experience in the Indian population is still limited. We aim to find out the efficacy and tolerability of this novel regimen, in a tertiary care center of Eastern India. MATERIALS AND METHODS: A descriptive observational study, longitudinal in design performed in the antiretroviral therapy (ART) center of a tertiary care hospital in Kolkata, West Bengal, India. All patients who attended the ART center from April 2021 to October 2022 were enrolled in the study following inclusion and exclusion criteria. A detailed history, clinical examination, necessary biochemical tests, and CD4 count of all patients were done at baseline. Subsequently, they were followed up for 6 months with monthly visits when they were enquired about any adverse effects requiring therapy interruptions. At the end of 6 months, CD4 count and viral load were measured. RESULTS: Out of a total sample of 249 patients, the TLD regimen was efficacious in 99.2% (n = 247) in whom viral load was suppressed to <1,000 copies/mL after 6 months of treatment. The regimen had to be temporarily discontinued in 6% of patients (n = 15). The most common cause of treatment interruption was hepatic dysfunction (3.2%) followed by cutaneous manifestation (2.4%). In 14 out of 15 patients, the regimen could be reintroduced and was safely tolerated afterward. Only one patient had to be shifted to an alternative regimen due to tenofovir-induced nephrotoxicity. Thus TLD was tolerated in 99.6% (n = 248) patients. CONCLUSION: The fixed-dose combination of TLD is a highly efficacious and well-tolerated first-line regimen for ART naïve patients with HIV infection having >95% adherence. How to cite this article: Sengupta D, Ghosh S, Pain S, et al. Efficacy and Tolerability of Tenofovir/Lamivudine/Dolutegravir among Antiretroviral Therapy Naive Human Immunodeficiency Virus Infected Patients of a Tertiary Care Center in Eastern India. J Assoc Physicians India 2023;71(9):72-74.

Association between Polypharmacy and Cardiovascular Autonomic Function among Elderly Patients in an Urban Municipality Area of Kolkata, India: A Record-Based Cross-Sectional Study.

We assessed the association between polypharmacy and cardiovascular autonomic function among community-dwelling elderly patients having chronic diseases. Three hundred and twenty-one patients from an urban municipality area of Kolkata, India were studied in August 2022. The anticholinergic burden and cardiac autonomic function (Valsalva ratio, orthostatic hypotension, change in diastolic blood pressure after an isometric exercise, and heart rate variability during expiration and inspiration) were evaluated. Binary logistic regression analysis was performed to find out the association of polypharmacy and total anticholinergic burden with cardiac autonomic neuropathy. A total of 305 patients (age, 68.9 ± 3.4; 65.9% male) were included. Of these patients, 81 (26.6%) were on polypharmacy. Out of these 81 patients, 42 patients were on ninety-eight potential inappropriate medications. The anticholinergic burden and the proportion of patients with cardiac autonomic neuropathy were significantly higher among patients who were on polypharmacy than those who were not (8.1 ± 2.3 vs. 2.3 ± 0.9; p = 0.03 and 56.8% vs. 44.6%; p = 0.01). The presence of polypharmacy and a total anticholinergic burden of > 3 was significantly associated with cardiac autonomic neuropathy (aOR, 2.66; 95% CI, 0.91−3.98 and aOR, 2.51; 95% CI, 0.99−3.52, respectively). Thus, polypharmacy was significantly associated with cardiac autonomic neuropathy among community-dwelling elderly patients.

A rare presentation of scrub typhus: myocarditis, acute liver failure and leukemoid reaction.

Scrub typhus is a mite borne zoonosis, caused by Orientia tsutsugamushi, a gram-negative intracellular organism. This infection usually presents in high prevalence in the rural areas of East Asia and Western pacific islands. It usually presents with fever, chill, myalgia, headache, skin rashes, having pathognomonic and skin lesion i.e. eschar in ~10% cases in Indian subcontinent. It can present with life-threatening complications on occasional. The simultaneous presentation of more than two complications is uncommon, rarely reported in literature. Here we report a case of 37-year-old woman with acute febrile illness, complicated with myocarditis, acute liver failure and leukemoid reaction. She was diagnosed promptly and successfully treated with doxycycline with full recovery of the complications.

An Observational Study on Metabolic Derangements in People Living with HIV.

BACKGROUND: HIV infection is a global pandemic. The adult HIV prevalence in India is 0.22%. Successful therapy is transforming HIV into a chronic medical condition, and there are many metabolic complications. This study aimed to evaluate the metabolic abnormalities in people living with HIV (PLHIV) who were on antiretroviral therapy (ART) for at least 2 years and compare it with ART-naïve patients as well as the effect of protease inhibitor-based (PI-based) and non-protease inhibitor-based (non-PI-based) ART was assessed. METHODOLOGY: Adult HIV-positive patients both ART-naïve and on ART for more than 2 years were included. Detailed history and clinical examination, including blood pressure and anthropometric measurements were done. This was followed by investigations like lipid profile including total cholesterol, triglyceride, high-density lipoprotein-cholesterol (HDL-C), low-density lipoprotein-cholesterol (LDL-C), fasting plasma glucose, and hemoglobin A1c (HbA1C) estimation. Standard statistical tools were utilized to assess derangements and association to therapy. RESULTS: The study was conducted for 1.5 years in a tertiary care hospital. A total of 70% of the study population was male with mean age of participants being 43.2 years, 40% were ART-naïve, 37% received non-PI-based ART, and 23% PI-based ART. The mean total cholesterol level and mean triglyceride value were significantly higher in the PI-based ART group than in the therapy-naïve group. The ART-naïve group was seen to have more subjects with abnormally low HDL-C values. The PI-based ART study subjects were found to have a greater number of cases of glucose intolerance in relation to the rest of the two groups significantly (p-value <0.001). The LDL-C systolic blood pressure (SBP), diastolic blood pressure (DBP), body mass index (BMI), and waist circumference had no association with the different ART regimens or with the HIV infection itself. CD4 T cell count at diagnosis in the three study groups was compared with all the variables of metabolic syndrome and no association was found. CONCLUSION: Total cholesterol, triglycerides, and glucose levels are the main parameters found to be affected in PLHIV on therapy.

COVID Associated Mucormycosis: A Study on the Spectrum of Clinical, Biochemical and Radiological Findings in A Series of Ten Patients.

BACKGROUND: There is more than twofold rise in prevalence of mucormycosis cases in India during the COVID-19 pandemic which needs to be evaluated. AIMS: The study aimed to document the spectrum of cases of mucormycosis seen at our Institute during COVID-19 times. METHODS: The study is a retrospective observational study carried out at our Institute from May 2021 to mid-June 2021. All patients with biopsy-proven mucormycosis were enrolled in the study. The patients were subjected to complete history taking, ophthalmological examination, and imaging studies. The patients were treated with a multidisciplinary approach with antifungal therapy as well as surgical intervention when needed. RESULTS: Ten patients (n=10) were seen, with a mean age of 50.3 years. The major risk factors included recent use of steroids, uncontrolled diabetes, and CKD. The most common presentation was swelling of unilateral eye and ptosis, followed by loss of vision. Inflammatory marker (CRP) and d-dimer were raised at presentation in all cases. Imaging showed the spread of infection from paranasal sinus to orbit and brain via cavernous sinus, which was a poor prognostic factor. Intravenous Amphotericin-B was given to all patients for at least 4 weeks. Two patients were discharged after completion of treatment and mortality was seen in three patients. CONCLUSION: We present an array of COVID-associated-mucormycosis (CAM) cases from Eastern India. CAM is presenting with rhino-orbito-cerebral involvement. There is poor outcome with cerebral involvement and high incidence of adverse effects with deoxycholate formulation of amphotericin-B. The causal association of COVID-19 with mucormycosis needs to be unearthed but possible preventive role of anticoagulation should be evaluated.

Role and regulation of Cdc25A phosphatase in neuron death induced by NGF deprivation or ß-amyloid.

Neuron death during development and in Alzheimer's disease (AD) is associated with aberrant regulation/induction of cell cycle proteins. However, the proximal events in this process are unknown. Cell cycle initiation requires dephosphorylation of cyclin-dependent kinases by cell division cycle 25A (Cdc25A). Here, we show that Cdc25A is essential for neuronal death in response to NGF deprivation or ß-amyloid (Aß) treatment and describe the mechanisms by which it is regulated in these paradigms. Cdc25A mRNA, protein and Cdc25A phosphatase activity were induced by NGF deprivation and Aß treatment. Enhanced Cdc25A expression was also observed in rat brains infused with Aß and in Aß-overexpressing AßPPswe-PS1dE9 mice. In cultured neurons Cdc25A inhibition by chemical inhibitors or shRNA prevented cell death and neurite degeneration caused by NGF deprivation or Aß. Additionally, Cdc25A inhibition diminished distal signaling events including Cdk-dependent elevation of phospho-pRb and subsequent caspase-3 activation. Mechanism studies revealed that Cdc25A induction by NGF deprivation and Aß is mediated by activation of Forkhead transcription factors that in turn suppress miR-21, a negative regulator of Cdc25A. Our studies thus identify Cdc25A as a required upstream element of the apoptotic cell cycle pathway that is required for neuron death in response to trophic factor deprivation and to Aß exposure and therefore as a potential target to suppress pathologic neuron death.

Pattern of Urinary Antibiograms in a Tertiary Care Hospital of Eastern India.

BACKGROUND: Indiscriminate use of antibiotics in urinary tract infections have led to emergence of 'superbugs' worldwide. Periodical review of antibiograms is of utmost importance for optimum patient benefit. OBJECTIVE: To identify the spectrum of organisms responsible for urinary tract infection and evaluate the pattern of antibiotic sensitivity of the organisms. METHODS: Urine samples were collected from all consecutive patients getting admitted in the medicine indoor irrespective of symptomatology. The clean-catch technique of midstream urine was used for patients able to void spontaneously while specimens of catheterized patients were obtained prior to catheter change. All samples were sent for routine examination as well as culture sensitivity tests. Descriptive statistical methods were used with the help of SPSS-15th version. RESULTS: The total number of patients was 262, 160 (60.3%) were male and 102 (39.7%) female. The age of the subjects varied from 18 to 85 years. Significant bacteruria was found in 35.9% patients. The commonest organisms isolated overall were E coli (59.6%) followed by enterococcus spp (14.9%) and Klebsiella (10.6%). Among catheterized subjects apart from E coli (64%), Klebsiella was found to be commoner (12%) than Enterococcus 10%. Most Enterobactereacae showed good response to aminoglycosides, cephoperazone sulbactam and nitrofurantoin. However, organisms like Enterobacter, Citrobacter, Morganella and pseudomonas were poorly responsive to the above and required higher antibiotics like carbapenems, and polymixin B. Staph. aureus was responsive to linezolid and vancomycin only. CONCLUSIONS: The progression of resistance of common urinary pathogens to higher antibiotics is an inexorable process. Our study reveals that new generation cephalosporins, quinolones and macrolides cannot keep up with the rapidity of emergence of multiresistant strains.

Urinary Ascites - A Consequence of Intraoperative Injury.

Patients with complications after surgery often pose enormous challenges to physicians. We report the case of a young lady developing fever, oliguria and intractable ascites refererred to us after undergoing abdominal surgery. She was diagnosed subsequently to have a urinoma with urinary ascites masquerading as a case of sepsis. Percutaneous nephrostomy followed by definitive repair and reimplantation of ureter later led to subsidence of the symptoms.

An observational study of dengue fever in a tertiary care hospital of eastern India.

BACKGROUND: Dengue fever (DF) has become a significant resurgent tropical disease in the past 20 years all over the globe. The recent outbreak in West Bengal has once again underlined our failure in vector control and prevention. Our study outlines the clinical spectrum as well as the geographical expansion of the disease beyond urban confines. MATERIAL AND METHODS: All patients with acute febrile illness positive for IgM antibody for Dengue virus were taken as cases. The patients were subjected to clinical examination and baseline investigations so as to fill in a structured proforma. RESULT: The total number of patients were 180 of whom 92 (51.1%) were male and 88 (48.9%) were female. The maximum number of patients belonged to the age group 20-29 years (26.9%). The patients mostly hailed from Kolkata followed by Nadia, 24- Parganas(S), Murshidabad and Midnapur. The most common presentation apart from fever and bodyache were gastrointestinal symptoms. 42% patients complained of abdominal pain, 24% had vomiting, 9.6% diarrhoea. Bleeding manifestations occurred in 23% of patients. CNS features were documented 10.4%. Case fatality came out to be 3.8%. Investigations revealed thrombocytopenia in 55% and leucopenia 32.7%, transaminitis in 72% Evidence of organomegaly (22.2%) and serositis (42%) were detected. Complications included intracranial haemorrhage, DIC, pancreatitis, myocarditis and even a solitary case of splenic rupture. CONCLUSION: The current outbreak was affecting both the genders equitably and mostly the younger age group from rural as well as urban areas. A febrile illness characterised by myalgia, mild bleeding and gastrointestinal symptoms, it was more or less promptly responsive to early conservative therapy like fluids, FFP and platelet transfusion where required.

An observational study of cutaneous manifestations in diabetes mellitus in a tertiary care Hospital of Eastern India.

BACKGROUND: Diabetes mellitus and its impact on the human body have been extensively dissected over the years. However, skin which is the largest organ in the body, has received minimum attention. Therefore, this study was designed to analyze the prevalence and pattern of skin disorders among diabetic patients from Eastern region of India. MATERIALS AND METHODS: This is an observational study, conducted in the General Medicine and Endocrinology departments of a Medical College and Hospital in Eastern India. The data were collected prospectively and systematically in a pre-established proforma designed by us, where clinical findings along with investigations were recorded. RESULTS: Six hundred and eighty (680) diabetic patients were examined, there were (64.8%) male and (35.1%) were female, of them 95.3% were Type 2 diabetics while 4.7% were Type 1. Five hundred and three patients (503) out of six hundred and eighty. i.e. 73.9% were found to have skin lesions. Thirteen (13) (41%) Type1 diabetics demonstrated skin lesions commonest being diabetic xerosis, infections and diabetic hand. Among Type2 diabetics 490(75.61%) showed skin lesions. Here infections, xerosis, hair loss beneath the knees, diabetic dermopathy were the most frequent. Majority of patients (67%) had combination of more than one type of skin lesion. There was statistically significant correlation of skin lesions with duration of diabetes, however similar correlation could not be demonstrated regarding metabolic control. CONCLUSION: Involvement of skin is inevitable and multifarious in diabetes mellitus. Higher prevalence is seen in Type 2 diabetic population. The duration of diabetes is positively correlated with lesions and infective dermatologic manifestations were associated with higher HbA1C values.

Spontaneous splenic rupture: A rare presentation of dengue fever.

Spontaneous rupture of the spleen with hemoperitoneum is a very rare, but serious manifestation of dengue fever (DF). We report a case of a young female who was presented with atraumatic abdominal pain, hypovolemic shock, anemia, ascites and hepatosplenomegaly with a recent history of a febrile illness. Subsequent investigations proved the presence of hemoperitoneum with spontaneous splenic rupture with seropositivity for DF. Early diagnosis and conservative management in this case resulted in a favorable outcome.

Tropical pyomyositis.

BACKGROUND: Tropical pyomyositis is characterized by suppuration within skeletal muscles, manifesting as single or multiple abscesses. Though primarily a disease of tropics, it is increasingly being reported from temperate regions in immunosuppressed patients. However, India has only few sporadic case reports. AIMS: The aim of this study is to evaluate the causative organisms, clinical presentations, diagnostic modalities, treatment protocols and outcome data in tropical pyomyositis patients. SUBJECTS AND METHODS: The study was carried out in Nilratan Sircar Medical College and Hospital, Kolkata over 3 years (July 2010 to June 2013). A total of 12 patients were diagnosed with tropical pyomyositis (confirmed with aspiration and culture of pus from muscle). All the investigation and treatment data were recorded systematically. RESULTS: The presenting feature was high fever and myalgia in all 12 patients. Quadriceps femoris was the most commonly involved muscle (50%); followed by iliopsoas (25%). Culture of the aspirate showed Staphylococcus aureus in nine patients (75%), Klebsiella pneumonia in one patient (8.33%) and no growth in two patients (16.67%) even after tubercular and fungal culture. CONCLUSIONS: Tropical pyomyositis can affect immune-competent individuals. S. aureus is the most commonly cultured organism. Immediate initiation of appropriate antibiotics and surgical debridement are required to avoid complications. The prognosis remains excellent if promptly treated.