Background:Babesiosis, caused by the parasitic blood-borne piroplasm Babesia microti, is emerging in the Northern hemisphere. We aimed to study long-term symptoms of patients with B microti infection in New York. Methods:A prospective longitudinal cohort study of human babesiosis was conducted at Stony Brook University Hospital. Inclusion criteria were age ≥18 years with positive blood smear for Babesia spp. Symptoms were assessed in patients at presentation and at 1, 6, and 12 months by 3 validated surveys: a visual analog scale, a quality of life (QOL) questionnaire, and the 36-Item Short Form Survey (SF-36). Results:In total, 38 patients with acute B microti infection (26% female; age range, 54-73 years) were enrolled from 2020 to 2022. Compared with baseline, the visual analog scale total symptom scores (with high scores representing worse status) significantly decreased at 6-month follow-up for the immunocompetent (n = 9; P < .001) and immunocompromised groups (n = 6; P < .001). Scores remained significantly higher in the immunocompromised group (ratio, 2.6; P = .045). At 1-year follow-up, the scores in the 2 groups tended to be similar (ratio, 0.9; P = .82). Within QOL concept scores (with low scores representing worse status), physical functioning significantly increased after 6 months of follow-up in both cohorts (immunocompetent, n = 10 [P = .004]; immunocompromised, n = 5 [P = .008]) but was still significantly lower in the immunocompromised group at that time (ratio, 0.7; P < .001). By the 12-month follow-up, physical functioning scores in the 2 groups appeared to converge, though the difference remained borderline significant (ratio, 0.9; P = .06). Conclusions:The time to convalescence was similar among patients with babesiosis, though immunocompromised patients tended to have more prolonged symptoms and worsened QOL after babesiosis at 1-year follow-up, compared with immunocompetent patients.

Purpose of Review This article aims to review the relevant updates in pathogenesis, diagnostics, clinical manifestations, and treatments of tick-borne diseases involving the nervous system, with special emphasis on emerging viral and bacterial infections transmitted by deer ticks ( Ixodes scapularis ). Recent Findings Neuroborreliosis includes a wide array of peripheral and/or central nervous system syndromes, of which diagnosis depends on a combination of clinical gestalt, serum serologic testing, and CSF cellular and serologic analysis. Powassan virus may cause life-threatening neuroinvasive disease and diagnosis that is based on CSF serology with treatment being largely supportive. Neurologic manifestations of anaplasmosis and babesiosis are rare but have been documented in case reports. Diagnosis is dependent on serum molecular and microscopic and serologic testing, and the pathophysiologic mechanisms of these neurologic syndromes are not fully understood. Borrelia miyamotoi is an emerging pathogen and, in immunocompromised patients, can cause severe meningoencephalitis. Summary Ixodes scapularis -borne infections such as Lyme disease, anaplasmosis, babesiosis, Powassan virus, and Borrelia miyamotoi disease can have significant neurologic manifestations. Due to the potential for poor outcomes, physicians must have a working knowledge of these pathogens, and a high index of suspicion is required to screen for these diseases in patients with the correct risk factors. Future research will help realize the full range of neurologic manifestations of these pathogens and also clarify their underlying pathophysiologic mechanisms, which will aid in developing new methods of diagnosis and treatment.

Background: Babesiosis, an intra-erythrocytic protozoan disease, is an emerging zoonotic parasitic disease worldwide. Cholesterol levels are correlated with severe infections, such as sepsis and COVID-19, and anecdotal reports suggest that high-density lipoprotein (HDL) cholesterol declines during acute babesiosis. Our aim was to describe the cholesterol levels in patients with acute babesiosis diagnosed in an endemic area in New York, hypothesizing that HDL levels correlate with the severity of infection. Methods: We reviewed the medical records of adult patients with babesiosis diagnosed by identification of Babesia parasites on a thin blood smear and confirmed by polymerase chain reaction from 2013 to 2018, who also had available a lipid profile drawn at the time of clinical presentation. Additional lipid profile levels were considered as "baseline" if they were drawn within 2 months before or after the infection as part of routine care. Results: A total of 39 patients with babesiosis had a lipid profile drawn on presentation. The patients were divided into two groups for comparison based on the treating physician's clinical decision: 33 patients who were admitted to the hospital and 8 patients who were evaluated as outpatients. A history of hypertension was more common in admitted patients (37% vs. 17%, p = 0.02). The median levels of low-density lipoprotein (LDL) and HDL were significantly reduced in admitted patients compared to non-admitted patients (46 vs. 76 mg/dL, p = 0.04; and 9 vs. 28.5 mg/dL, p = 0.03, respectively). In addition, LDL and HDL levels returned to baseline values following resolution of acute babesiosis. Conclusion: LDL and HDL levels are significantly reduced during acute babesiosis, suggesting that cholesterol depletion may predict disease severity. Pathogen and host factors may contribute to a reduction in serum cholesterol levels during acute babesiosis.

This paper proposes using a logic programming language to disentangle X.509 certificate validation policy from mechanism. Expressing validation policies in a logic programming language provides multiple benefits. First, policy and mechanism can be more independently written, augmented, and analyzed compared to the current practice of interweaving them within a C or C++ implementation. Once written, these policies can be easily shared and modified for use in different TLS clients. Further, logic programming allows us to determine when clients differ in their policies and use the power of imputation to automatically generate interesting certificates, e.g., a certificate that will be accepted by one browser but not by another. We present a new framework called Hammurabi for expressing validation policies, and we demonstrate that we can express the complex policies of the Google Chrome and Mozilla Firefox web browsers in this framework. We confirm the fidelity of the Hammurabi policies by comparing the validation decisions they make with those made by the browsers themselves on over ten million certificate chains derived from Certificate Transparency logs, as well as 100K synthetic chains. We also use imputation to discover nine validation differences between the two browsers' policies. Finally, we demonstrate the feasibility of integrating Hammurabi into Firefox and the Go language in less than 100 lines of code each.

Procalcitonin is gaining momentum in the study of protozoal sepsis, but its utility as a biomarker has yet to be fully discovered in human babesiosis. A total of 33 cases of acute babesiosis dating between 2012 and 2019 were retrospectively collected from Stony Brook University Hospital (SBUH) and Stony Brook South Hampton Hospital (SHH), both of which are located on Long Island, NY. Cases were cross-referenced for the need for ICU admission, and the procalcitonin levels were measured by the use of BRAHMS Elecsys assay at SBUH and BRAHMS Architect assay at SHH. Our study demonstrated that the log-transformed procalcitonin levels had a linear correlation with log-transformed maximum parasitemia, which suggests that procalcitonin directly correlates with parasitemia values. Furthermore, when comparing values that predict ICU admission, our ROC analysis of procalcitonin demonstrated similar AUC values to the percentage of parasitemia, suggesting that procalcitonin may assist in determining the severity of disease. We demonstrate that procalcitonin may directly correlate with the parasitemia percentage and have prognostic capabilities, which suggests that procalcitonin may have biomarker potential in human babesiosis.

This paper proposes using a logic programming language to disentangle X.509 certificate validation policy from mechanism. Expressing validation policies in a logic programming language provides multiple benefits. First, policy and mechanism can be more independently written, augmented, and analyzed compared to the current practice of interweaving them within a C or C++ implementation. Once written, these policies can be easily shared and modified for use in different TLS clients. Further, logic programming allows us to determine when clients differ in their policies and use the power of imputation to automatically generate interesting certificates, e.g., a certificate that will be accepted by one browser but not by another.

We have developed HandMATE (Hand Movement Assisting Therapy Exoskeleton); a wearable motorized hand exoskeleton for home-based movement therapy following stroke. Each finger and the thumb is powered by a linear actuator which provides flexion and extension assistance. Force sensitive resistors integrated into the design measure grasp and extension initiation force. An assistive therapy mode is based on an admittance control strategy. We evaluated our control system via subject and bench testing. Errors during a grip force tracking task while using the HandMATE were minimal (<; 1%) and comparable to unassisted healthy hand performance. We also outline a dedicated app we have developed for optimal use of HandMATE at home. The exoskeleton communicates wirelessly with an Android tablet which features guided exercises, therapeutic games and performance feedback. We surveyed 5 chronic stroke patients who used the HandMATE device to further evaluate our system, receiving positive feedback on the exoskeleton and integrated app.

Objective. Closed-loop mechanical ventilation has the potential to provide more effective ventilatory support to patients with less complexity than conventional ventilation. The purpose of this study was to investigate the effectiveness of an automatic technique for mechanical ventilation. Methods. Two closed-loop control systems for mechanical ventilation are combined in this study. In one of the control systems several physiological data are used to automatically adjust the frequency and tidal volume of breaths of a patient. This method, which is patented under US Patent number 4986268, uses the criterion of minimal respiratory work rate to provide the patient with a natural pattern of breathing. The inputs to the system include data representing CO2 and O2 levels of the patient as well as respiratory compliance and airway resistance. The I:E ratio is adjusted on the basis of the respiratory time constant to allow for effective emptying of the lungs in expiration and to avoid intrinsic positive end expiratory pressure (PEEP). This system is combined with another closed-loop control system for automatic adjustment of the inspired fraction of oxygen of the patient. This controller uses the feedback of arterial oxygen saturation of the patient and combines a rapid stepwise control procedure with a proportional-integral-derivative (PID) control algorithm to automatically adjust the oxygen concentration in the patient's inspired gas. The dual closed-loop control system has been examined by using mechanical lung studies, computer simulations and animal experiments. Results. In the mechanical lung studies, the ventilation controller adjusted the breathing frequency and tidal volume in a clinically appropriate manner in response to changes in respiratory mechanics. The results of computer simulations and animal studies under induced disturbances showed that blood gases were returned to the normal physiologic range in less than 25 s by the control system. In the animal experiments under steady-state conditions, the maximum standard deviations of arterial oxygen saturation and the end-tidal partial pressure of CO2 were ± 1.76% and ± 1.78 mmHg, respectively. Conclusion. The controller maintained the arterial blood gases within normal limits under steady-state conditions and the transient response of the system was robust under various disturbances. The results of the study have showed that the proposed dual closed-loop technique has effectively controlled mechanical ventilation under different test conditions.

Objective.Supplemental oxygen treatment of patients on mechanical ventilation is crucial in maintaining the patients’ oxygen levels in the normal range. The purpose of this study was to evaluate the effectiveness of a closed-loop controller for automatic adjustment of the fraction of inspired oxygen, FIO2. More specifically, the aim of the study was to assess the robustness of the controller in correcting hypoxemia as well as its effectiveness in prevention of hyperoxemia and oxygen toxicity. Methods.The microprocessor-based feedback control system combines a rapid control algorithm with a proportional-integral-derivative (PID) control procedure to automatically adjust FIO2. The system is designed to prevent hypoxemia by applying a stepwise control procedure in response to rapid declines in arterial oxygen saturation while fine-tuning FIO2 and avoiding hyperoxemia by resuming to the PID control procedure when appropriate. The system includes a sophisticated safeguard unit which is designed to communicate any oxygenation problems or measurement artifacts to the medical personnel while keeping FIO2 at a safe and sufficiently high level. The control system has been tested by using computer simulations as well as animal studies. Results.In response to different disturbances, the arterial oxygen saturation returned to the normal safe range within less than 20 seconds, thereby avoiding any untoward effects of hypoxemia. Under steady state conditions, the variations in arterial oxygen saturation were kept within ± 3% of the mean value. The controller corrected hypoxemia within seconds while preventing hyperoxemia, rejecting artifacts, and minimizing exposure to high concentrations of oxygen. Conclusion.The results of the study attest to the reliability of the proposed closed-loop control scheme for automatic adjustment of FIO2. Further evaluation of the controller will require testing the effectiveness of the system on different patient groups.

In erythrocytes, 80-kD protein 4.1R regulates critical membrane properties of deformability and mechanical strength. However, previously obtained data suggest that multiple isoforms of protein 4.1, generated by alternative pre-mRNA splicing, are expressed during erythroid differentiation. Erythroid precursors use two splice acceptor sites at the 5′ end of exon 2, thereby generating two populations of 4.1 RNA: one that includes an upstream AUG-1 in exon 2′ and encodes high molecular weight isoforms, and another that skips AUG-1 in exon 2′ and encodes 4.1 by initiation at a downstream AUG-2 in exon 4. To begin an analysis of the complex picture of protein 4.1R expression and function during erythropoiesis, we determined the number and primary structure of 4.1R isoforms expressed in erythroblasts. We used reverse-transcription polymerase chain reaction to amplify and clone full-length coding domains from the population of 4.1R cDNA containing AUG-1 and the population excluding AUG-1. We observed an impressive repertoire of 4.1R isoforms that included 7 major and 11 minor splice variants, thus providing the first definitive characterization of 4.1R primary structures in a single-cell lineage. 4.1R isoforms, transfected into COS-7 cells, distributed to the nucleus, cytoplasm, plasma membrane, and apparent centrosome. We confirmed previous studies showing that inclusion of exon 16 was essential for efficient nuclear localization. Unexpectedly, immunochemical analysis of COS-7 cells transfected with an isoform lacking both AUG-1 and AUG-2 documented that a previously unidentified downstream translation initiation codon located in exon 8 can regulate expression of 4.1R. We speculate that the repertoire of primary structure of 4.1R dictates its distinct binding partners and functions during erythropoiesis.

Transcripts for two genes expressed early in alfalfa nodule development (MsENOD40 and MsENOD2) are found in mycorrhizal roots, but not in noncolonized roots or in roots infected with the fungal pathogen Rhizoctonia solani. These same two early nodulin genes are expressed in uninoculated roots upon application of the cytokinin 6-benzylaminopurine, Correlated with the expression of the two early nodulin genes, we found that mycorrhizal roots contain higher levels of trans-zeatin riboside than nonmycorrhizal roots. These data suggest that there may be conservation of signal transduction pathways between the two symbioses-nitrogen fixing nodules and phosphate-acquiring mycorrhizae.