Insights into the dynamic trajectories of protein filament division revealed by numerical investigation into the mathematical model of pure fragmentation.

The dynamics by which polymeric protein filaments divide in the presence of negligible growth, for example due to the depletion of free monomeric precursors, can be described by the universal mathematical equations of 'pure fragmentation'. The rates of fragmentation reactions reflect the stability of the protein filaments towards breakage, which is of importance in biology and biomedicine for instance in governing the creation of amyloid seeds and the propagation of prions. Here, we devised from mathematical theory inversion formulae to recover the division rates and division kernel information from time-dependent experimental measurements of filament size distribution. The numerical approach to systematically analyze the behaviour of pure fragmentation trajectories was also developed. We illustrate how these formulae can be used, provide some insights on their robustness, and show how they inform the design of experiments to measure fibril fragmentation dynamics. These advances are made possible by our central theoretical result on how the length distribution profile of the solution to the pure fragmentation equation aligns with a steady distribution profile for large times.

Cellular and humoral immune response after mRNA-1273 SARS-CoV-2 vaccine in liver and heart transplant recipients.

Recently published studies have found an impaired immune response after SARS-CoV-2 vaccination in solid organ recipients. However, most of these studies have not assessed immune cellular responses in liver and heart transplant recipients. We prospectively studied heart and liver transplant recipients eligible for SARS-CoV-2 vaccination. Patients with past history of SARS-CoV-2 infection or SARS-CoV-2 detectable antibodies (IgM or IgG) were excluded. We assessed IgM/IgG antibodies and ELISpot against the S protein 4 weeks after receiving the second dose of the mRNA-1273 (Moderna) vaccine. Side effects, troponin I, liver tests and anti-HLA donor-specific antibodies (DSA) were also assessed. A total of 58 liver and 46 heart recipients received two doses of mRNA-1273 vaccine. Median time from transplantation to vaccination was 5.4 years (IQR 0.3-27). Sixty-four percent of the patients developed SARS-CoV-2 IgM/IgG antibodies and 79% S-ELISpot positivity. Ninety percent of recipients developed either humoral or cellular response (87% in heart recipients and 93% in liver recipients). Factors associated with vaccine unresponsiveness were hypogammaglobulinemia and vaccination during the first year after transplantation. Local and systemic side effects were mild or moderate, and none presented DSA or graft dysfunction after vaccination. Ninety percent of our patients did develop humoral or cellular responses to mRNA-1273 vaccine. Factors associated with vaccine unresponsiveness were hypogammaglobulinemia and vaccination during the first year after transplantation, highlighting the need to further protect these patients.

Obstetric emergencies at the United States-Mexico border crossings in El Paso, Texas.

OBJECTIVE: To describe the frequency, characteristics, and patient outcomes for women who accessed Emergency Medical Services (EMS) for obstetric emergencies at the ports of entry (POE) between El Paso, Texas, United States of America, and Ciudad Juárez, Chihuahua, Mexico. METHODS: A descriptive study of women 12-49 years of age for whom an EMS ambulance was called to an El Paso POE location from December 2008-April 2011 was conducted. Women were identified through surveillance of EMS records. EMS and emergency department (ED) records were abstracted for all women through December 2009 and for women with an obstetric emergency through April 2011. For obstetric patients admitted to the hospital, additional prenatal and birth characteristics were collected. Frequencies and proportions were estimated for each variable; differences between residents of the United States and Mexico were tested. RESULTS: During December 2008-December 2009, 47.6% (68/143) of women receiving EMS assistance at an El Paso POE had an obstetric emergency, nearly 20 times the proportion for Texas overall. During December 2008-April 2011, 60.1% (66/109) of obstetric patients with ED records were admitted to hospital and 52 gave birth before discharge. Preterm birth (23.1%; No. = 12), low birth weight (9.6%; No. = 5), birth in transit (7.7%; No. = 4), and postpartum hemorrhage (5.8%; No. = 3) were common; fewer than one-half the women (46.2%; No. = 24) had evidence of prenatal care. CONCLUSIONS: The high proportion of obstetric EMS transports and high prevalence of complications in this population suggest a need for binational risk reduction efforts.

Notes from the field: measles transmission at a domestic terminal gate in an international airport - United States, January 2014.

In March 2014, CDC identified a possible cluster of four laboratory-confirmed measles cases among passengers transiting a domestic terminal in a U.S. international airport. Through epidemiologic assessments conducted by multiple health departments and investigation of flight itineraries by CDC, all four patients were linked to the same terminal gate during a 4-hour period on January 17, 2014. Patient 1, an unvaccinated man aged 21 years with rash onset February 1, traveled on two domestic flights on January 17 and 18 that connected at the international airport. Patient 2, an unvaccinated man aged 49 years with rash onset February 1, traveled from the airport on January 17. Patient 3, an unvaccinated man aged 19 years with rash onset January 30, traveled domestically with at least a 4-hour layover at the airport on January 17. Patient 4, an unvaccinated man aged 63 years with rash onset February 5, traveled on a flight to the airport on January 17.

Metabolic effects of the contraceptive skin patch and subdermal contraceptive implant in Mexican women: a prospective study.

BACKGROUND: The contraceptive skin patch (CSP) accepted by the U.S. FDA in 2001 includes ethinylestradiol and norelgestromine, whereas the subdermal contraceptive implant (SCI) has etonogestrel and is also approved by the FDA. In Mexico, both are now widely used for contraception but their effects on Mexican population are unknown. The objective of the study was to evaluate if these treatments induce metabolic changes in a sample of indigenous and mestizo Mexican women. METHODS: An observational, prospective, longitudinal, non-randomized study of women between 18 and 35 years of age assigned to CSP or SCI. We performed several laboratory tests: clinical chemistry, lipid profile, and liver and thyroid function tests. Also, serum levels of insulin, C-peptide, IGF-1, leptin, adiponectin, and C reactive protein were assayed. RESULTS: Sixty-two women were enrolled, 25 used CSP (0 indigenous; 25 mestizos) and 37 used SCI (18 indigenous; 19 mestizos). Clinical symptoms were relatively more frequent in the SCI group. Thirty-four contraceptive users gained weight without other clinical significant changes. After 4 months of treatment, significant changes were found in some biochemical parameters in both treatment groups. Most were clinically irrelevant. Interestingly, the percentage of users with an abnormal atherogenic index diminished from 75% to 41.6% after follow-up. CONCLUSIONS: The CSP slightly modified the metabolic variables. Most changes were nonsignificant, whereas for SCI users changes were more evident and perhaps beneficial. Results of this attempt to evaluate the effects of contraceptives in mestizo and native-American populations show that clinical symptoms are frequent in Mexican users of CSP and SCI. Although these medications may affect some metabolic variables, these changes seem clinically irrelevant. Induction of abnormalities in other physiological pathways cannot be ruled out.

Impact of SARS-CoV-2 Infection on Humoral and Cellular Immunity in a Cohort of Vaccinated Solid Organ Transplant Recipients.

The aim of the present study was to determine humoral and T-cell responses after four doses of mRNA-1273 vaccine in solid organ transplant (SOT) recipients, and to study predictors of immunogenicity, including the role of previous SARS-CoV-2 infection in immunity. Secondarily, safety was also assessed. Liver, heart, and kidney transplant recipients eligible for SARS-CoV-2 vaccination from three different institutions in Barcelona, Spain were included. IgM/IgG antibodies and T cell ELISpot against the S protein four weeks after receiving four consecutive booster doses of the vaccine were analyzed. One hundred and forty-three SOT recipients were included (41% liver, 38% heart, and 21% kidney). The median time from transplantation to vaccination was 6.6 years (SD 7.4). In total, 93% of the patients developed SARS-CoV-2 IgM/IgG antibodies and 94% S-ELISpot positivity. In total, 97% of recipients developed either humoral or cellular response (100% of liver recipients, 95% of heart recipients, and 88% of kidney recipients). Hypogammaglobulinemia was associated with the absence of SARS-CoV-2 IgG/IgM antibodies and S-ELISpot reactivity after vaccination, whereas past symptomatic SARS-CoV-2 infection was associated with SARS-CoV-2 IgG/IgM antibodies and S-ELISpot reactivity. Local and systemic side effects were generally mild or moderate, and no recipients experienced the development of de novo DSA or graft dysfunction following vaccination.

Instability of the Rayleigh-Jeans spectrum in weak wave turbulence theory.

We study the four-wave kinetic equation of weak turbulence linearized around the Rayleigh-Jeans spectrum when the collision integral is associated with short-range interactions between nonrelativistic bosonic quasiparticles. The technique used for the analysis of the stability is based on the properties of the Mellin transform of the kernel in the integral equation. We find that any perturbation of the Rayleigh-Jeans distribution evolves toward low-momentum scales in such a form that when t-->infinity, all the particles occupy a sphere of radius arbitrary small.

A new paradigm for quarantine and public health activities at land borders: opportunities and challenges.

The Institute of Medicine (IOM) report Quarantine Stations at Ports of Entry: Protecting the Public's Health focused almost exclusively on U.S. airports and seaports, which served 106 million entries in 2005. IOM concluded that the primary function of these quarantine stations (QSs) should shift from providing inspection to providing strategic national public health leadership. The large expanse of our national borders, large number of crossings, sparse federal resources, and decreased regulation regarding conveyances crossing these borders make land borders more permeable to a variety of threats. To address the health challenges related to land borders, the QSs serving such borders must assume unique roles and partnerships to achieve the strategic leadership and public health research roles envisioned by the IOM. In this article, we examine how the IOM recommendations apply to the QSs that serve the land borders through which more than 319 million travelers, immigrants, and refugees entered the U.S. in 2005.

Unauthorized border crossings and migrant deaths: Arizona, New Mexico, and El Paso, Texas, 2002-2003.

OBJECTIVES: We examined the major causes of and risk factors for death among migrants who died while making unauthorized border crossings into the United States from Mexico. METHODS: Decedents were included in the study if (1) their remains were found between January 1, 2002, and December 31, 2003, in any US county along the 650-mi (1040-km) section of the US-Mexican border from Yuma, Ariz, to El Paso, Tex; (2) their immigration status was unauthorized; and (3) they were believed to have died during transit from Mexico to the United States. Characteristics of the decedents and causes of and risk factors for their deaths were examined. RESULTS: Among the 409 decedents meeting our inclusion criteria, environmental heat exposure (n=250; 61.1%) was the leading cause of death, followed by vehicle crashes (n=33; 8.1%) and drownings (n=24; 5.9%). Male decedents (n= 298; 72.8%) outnumbered female decedents (n = 105; 25.6%) nearly 3 to 1. More than half of the decedents were known to be Mexican nationals (n=235; 57.5%) and were aged 20 to 39 years (n=213; 52.0%); the nationality of 148 (36.2%) decedents was undetermined. CONCLUSIONS: Deaths among migrants making unauthorized crossings of the US-Mexican border are due to causes that are largely preventable. Prevention strategies should target young Mexican men, and focus on preventing them from conceiving plans to cross the border, discouraging them from using dangerous routes as crossing points, and providing search-and-rescue teams to locate lost or injured migrant crossers.

Civil Surgeon Tuberculosis Evaluations for Foreign-Born Persons Seeking Permanent U.S. Residence.

Foreign-born persons in the United States seeking to adjust their status to permanent resident must undergo screening for tuberculosis (TB) disease. Screening is performed by civil surgeons (CS) following technical instructions by the Centers for Disease Control and Prevention. From 2011 to 2012, 1,369 practicing CS in California, Texas, and New England were surveyed to investigate adherence to the instructions. A descriptive analysis was conducted on 907 (66%) respondents. Of 907 respondents, 739 (83%) had read the instructions and 565 (63%) understood that a chest radiograph is required for status adjustors with TB symptoms; however, only 326 (36%) knew that a chest radiograph is required for immunosuppressed status adjustors. When suspecting TB disease, 105 (12%) would neither report nor refer status adjustors to the health department; 91 (10%) would neither start treatment nor refer for TB infection. Most CS followed aspects of the technical instructions; however, educational opportunities are warranted to ensure positive patient outcomes.

Border Lookout: Enhancing Tuberculosis Control on the United States-Mexico Border.

We evaluated the use of federal public health intervention tools known as the Do Not Board and Border Lookout (BL) for detecting and referring infectious or potentially infectious land border travelers with tuberculosis (TB) back to treatment. We used data about the issuance of BL from April 2007 to September 2013 to examine demographics and TB laboratory results for persons on the list (N = 66) and time on the list before being located and achieving noninfectious status. The majority of case-patients were Hispanic and male, with a median age of 39 years. Most were citizens of the United States or Mexico, and 30.3% were undocumented migrants. One-fifth had multidrug-resistant TB. Nearly two-thirds of case-patients were located and treated as a result of being placed on the list. However, 25.8% of case-patients, primarily undocumented migrants, remain lost to follow-up and remain on the list. For this highly mobile patient population, the use of this novel federal travel intervention tool facilitated the detection and treatment of infectious TB cases that were lost to follow-up.

Outcomes of multidrug-resistant tuberculosis among binational cases in El Paso, Texas.

In the United States, multidrug-resistant tuberculosis (MDR-TB) is more commonly seen among foreign-born patients. We report outcomes for 46 patients with MDR-TB who were born in Mexico and treated along the United States-Mexico border. According to our definition, 30 were cured, 3 showed treatment failure, 3 died, and 10 abandoned treatment. Multidrug-resistant tuberculosis can be successfully treated on an ambulatory basis.

Obstetric emergencies at the United States-Mexico border crossings in El Paso, Texas / Urgencias obstétricas en la frontera entre los Estados Unidos y México en El Paso, Texas

Objective. To describe the frequency, characteristics, and patient outcomes for women who accessed Emergency Medical Services (EMS) for obstetric emergencies at the ports of entry (POE) between El Paso, Texas, United States of America, and Ciudad Juárez, Chihuahua, Mexico. Methods. A descriptive study of women 12-49 years of age for whom an EMS ambulance was called to an El Paso POE location from December 2008-April 2011 was conducted. Women were identified through surveillance of EMS records. EMS and emergency department (ED) records were abstracted for all women through December 2009 and for women with an obstetric emergency through April 2011. For obstetric patients admitted to the hospital, additional prenatal and birth characteristics were collected. Frequencies and proportions were estimated for each variable; differences between residents of the United States and Mexico were tested. Results. During December 2008-December 2009, 47.6% (68/143) of women receiving EMS assistance at an El Paso POE had an obstetric emergency, nearly 20 times the proportion for Texas overall. During December 2008-April 2011, 60.1% (66/109) of obstetric patients with ED records were admitted to hospital and 52 gave birth before discharge. Preterm birth (23.1%; No. = 12), low birth weight (9.6%; No. = 5), birth in transit (7.7%; No. = 4), and postpartum hemorrhage (5.8%; No. = 3) were common; fewer than one-half the women (46.2%; No. = 24) had evidence of prenatal care. Conclusions. The high proportion of obstetric EMS transports and high prevalence of complications in this population suggest a need for binational risk reduction efforts.

Objetivo. Describir la frecuencia, las características y los resultados asistenciales de las mujeres que recibieron atención médica de urgencia por problemas obstétricos en los puntos fronterizos entre El Paso (Texas, Estados Unidos) y Ciudad Juárez (Chihuahua, México). Métodos. Se realizó un estudio descriptivo de las mujeres de 12 a 49 años de edad para las que se solicitó una ambulancia de urgencia desde los puntos de ingreso de El Paso entre diciembre del 2008 y abril del 2011. Para identificar a las mujeres se hizo un seguimiento de los archivos de los servicios de urgencias. Se resumieron los historiales de los servicios de urgencias y del departamento de urgencias hasta diciembre del 2009 en el caso de todas las mujeres y hasta abril del 2011 en el caso de las mujeres con una urgencia obstétrica. Respecto a las pacientes ingresadas en hospitales por cuadros obstétricos, se recopilaron además las características prenatales y los datos del parto. Se calcularon las frecuencias y las proporciones relativas a cada variable; se analizaron las diferencias entre las residentes de los Estados Unidos y las de México. Resultados. En el período comprendido entre diciembre del 2008 y diciembre del 2009, 47,6% (68/143) de las mujeres atendidas de urgencia en un punto fronterizo de El Paso presentó una urgencia obstétrica, casi 20 veces la proporción correspondiente al estado de Texas en general. Entre diciembre del 2008 y abril del 2011, 60,1% (66/109) de las pacientes obstétricas con historial en el departamento de urgencias fueron ingresadas en un hospital y 52 dieron a luz antes de recibir el alta. Fueron frecuentes los partos prematuros (23,1%; No. = 12), el peso bajo al nacer (9,6%, No. = 5), los partos en tránsito (7,7%; No. = 4) y las hemorragias posparto (5,8%; No. = 3); en menos de la mitad de los casos (46,2%; No. = 24) no se constató que las mujeres hubiesen recibido asistencia prenatal. Conclusiones. La elevada proporción de transportes por urgencias obstétricas y la alta prevalencia de complicaciones en esta población ponen de manifiesto la necesidad de actuaciones binacionales para reducir los riesgos.

[Extracorporeal tumorectomy and autotransplantation in a patient with a single kidney and a multicentric clear cell carcinoma]. / Enucleación extracorpórea y autotransplante en paciente con riñón único con cáncer renal multicéntrico de células claras.

OBJECTIVE: To demonstrate that "bench surgery" and autotransplantation are still alternatives in the treatment of complex renal cancer cases. METHODS: 58 y/o female with history of radical nephrectomy due to renal cancer who asked for medical attention because of back pain. Renal masses were found during her evaluation and she was referred to our service. RESULTS: Lumbar incision was the preferred approach. After removal, the kidney was irrigated with EuroCollins solution and bench surgery was performed. Cold ischemia time was 63 minutes. The kidney was transplanted into the right pelvic region. Diuresis was immediately achieved after vascular anastomosis. Lich-Gregoir ureteral implant was carried out. During the first 48 hrs no complication was reported, urine output was about 80 cc/hour. She eventually developed renal failure and after 6 sessions of hemodialysis recovered to void in the previous volume range. She had a urinary leak that was resolved with CFT-guided percutaneus drainage. Twelve months after the procedure, she has no complaints; serum creatinine is 1.6 mg/dl and CT scan shows no evidence of recurrences. CONCLUSIONS: Bench surgery is still a therapeutic alternative for the treatment of complex renal cancer cases in order to avoid dialysis.

Locally acquired hepatitis E virus infection, El Paso, Texas.

Hepatitis E virus (HEV) is an enterically transmitted RNA virus that causes both epidemic and sporadic cases of acute hepatitis. Despite sero-surveys showing antibody to HEV in up to 36% of the US population, acute hepatitis E has been reported among individuals with no history of international travel only three times in the United States. We report a case of apparently locally-acquired hepatitis E that occurred in El Paso, Texas that was 98% similar to a previously isolated HEV found in swine in the United States. Like the three previous cases, a thorough investigation found no conclusive sources of infection. Active case surveillance found no additional cases.

Cáncer hepático primario: características epidemiológicas, clínicas y bioquímicas / Primary hepatic cancer: epidemiological, clinical and biochemical characteristics

En este trabajo se revisaron retrospectiva y prospectivamente algunos aspectos clínicos, epidemiológicos, bioquímicos y de gabinete del cáncer hepático primario (CHP) en pacientes internados en nuestro hospital. Este estudio comprende 76 pacientes estudiados de 1971 a 1990. 49 hombres y 27 mujeres. La edad promedio fue de 67.1 ñ 11.7 años. El carcinoma hepatocelular (CHC) fue el tipo histológico más frecuente (84.1 por ciento), seguido por el colangiocarcinoma (CC) con 8.7 por ciento, el carcinoma mixto (CM) con 4.4 por ciento y finalmente el hepatoblastoma (HB) con 2.9 por ciento. A parte, se revisó material de 1485 autopsias, encontrándose que la prevalencia de CHP fue de 0.74 por ciento y los sitios más frecuentes de metástasis fueron los pulmones (66 por ciento) y la vena porta (50 por ciento). El 80 por ciento de los casos de CHC diagnosticado por autopsia presentaban concomitantemente cirrosis hepática. Los síntomas generales y el dolor abdominal fueron las manifestaciones clínicas más comunes (72.5 por ciento). Además, se observó la fosfatasa alcalina elevada en el 77 por ciento de los casos, hiperbilirrubinemia en el 62 por ciento y anemia en el 62 por ciento. En el 61.7 por ciento el tumor fue bilateral o difuso. Todos los tumores solitarios medían más de 5 cms de diámetros por ecografía al momento del diagnóstico. La AFP fue normal en el 18 por ciento de los casos de CHC y el 40 por ciento de estos pacientes tuvo al menos un marcador positivo para el virus de la hepatitis B

Trasplante hepático ortotópico. Experiencia en Monterrey, N. L. [simposio] / Orthotopic liver transplantation. Experience in Monterrey, NL, Mexico [symposium]

Objetivo. Estudiar el curso clínico y la supervivencia de 4 pacientes con trasplante hepático ortotópico (THO) realizados en Monterrey, N.L. Antecedentes. El programa de THO en humanos se inicio en 1991 en el Hospital Universitario de la UANL en Monterrey. Resultados. Tres pacientes pediátricos con diagnóstico de cirrosis hepáticos por atresia de vías biliares y un paciente adulto con cirrosis hepática alcohólica, todos con clasificación C Child-Pugh. El trasplante realizado fue completo en dos pacientes. Uno pediátrico y un adulto, reducido en dos pacientes pediátricos, uno de éstos con injerto de donador vivo relacionado. El esquema de inmunosupresión fue a base de ciclosporina, esteroides y azatriopina. Complicaciones: hemorragia abdominal; hipertensión arterial; colangitis y colestasis; insuficiencia renal aguda; neumonía, datos de rechazo, sepsis y fuga biliar en dos casos, respectivamente y pancreatitis aguda en un caso. Sobrevida: límites de 16 horas a 3 años con 5 meses. Conclusiones. El THO en pacientes con enfermedades terminales del hígado es una terapéutica quirúrgica moderna capaz de rehabilitar y prolongar la sobrevida de estos pacientes. La factibilidad de THO reducido con donadores vivos constituye una opción ante la escasez de órganos