RESULTS: A total of 140 pregnant and 140 nonpregnant females were

RESULTS: A total of 140 pregnant and 140 nonpregnant females were enrolled in the study. The IFN-gamma release selleck products assay was highly specific, and IFN-gamma release assay positivity was associated with a greater likelihood of exposure to M tuberculosis. The overall agreement between the tuberculin skin test and IFN-gamma release assay results was 88% for all pregnant patients, corresponding to a kappa of 0.452 (confidence interval 0.26-0.64). Interferon-gamma release from the mitogen did not appear to have

any temporal association with pregnancy trimester in cross-sectional or longitudinal studies. The IFN-gamma release assay performed equally well in pregnant and nonpregnant females.

CONCLUSION: The IFN-gamma release assay performed equally well in each trimester of pregnancy with comparable results to nonpregnant females. Interferon-gamma release assays are much more specific, at least

as sensitive, and may be a better predictor of disease progression than the tuberculin skin test. (Obstet Gynecol 2012;119:1088-95) DOI: 10.1097/AOG.0b013e3182546aff”
“Background: According to recent guidelines, patients with coronary artery disease (CAD) should undergo revascularization if significant myocardial ischemia is present. Both, cardiovascular ARN-509 magnetic resonance (CMR) and fractional flow reserve (FFR) allow for a reliable ischemia assessment and in combination with anatomical information provided by invasive

coronary angiography (CXA), such a work-up sets the basis for a decision to revascularize or not. The cost-effectiveness ratio of these two strategies is compared.

Methods: Strategy 1) CMR to assess ischemia followed by CXA in ischemia-positive patients (CMR + CXA), Strategy 2) CXA followed by FFR in angiographically positive HM781-36B chemical structure stenoses (CXA + FFR). The costs, evaluated from the third party payer perspective in Switzerland, Germany, the United Kingdom (UK), and the United States (US), included public prices of the different outpatient procedures and costs induced by procedural complications and by diagnostic errors. The effectiveness criterion was the correct identification of hemodynamically significant coronary lesion(s) (= significant CAD) complemented by full anatomical information. Test performances were derived from the published literature. Cost-effectiveness ratios for both strategies were compared for hypothetical cohorts with different pretest likelihood of significant CAD.

Results: CMR + CXA and CXA + FFR were equally cost-effective at a pretest likelihood of CAD of 62% in Switzerland, 65% in Germany, 83% in the UK, and 82% in the US with costs of CHF 5’794, (sic)1’517, 2’680 pound, and $2’179 per patient correctly diagnosed. Below these thresholds, CMR + CXA showed lower costs per patient correctly diagnosed than CXA + FFR.

Subsequently, we were able to identify eight novel inhibition tar

Subsequently, we were able to identify eight novel inhibition targets through constraint-based modeling methods. The results Selleckchem LEE011 of this study are expected to yield meaningful avenues for further research in the task of mediating the Toll-like receptor signaling network and its effects.”
“Pigmentation of various amino compounds with garlic thiosulfinates was investigated. Aminocarbonyl compounds including aldehydes, amino acids, peptides, and proteins formed compound-specific characteristic pigments with thiosulfinates, regardless of their origin. An intact amino group was essential, and the replacement of an amino group’s hydrogen atom made them unable to form pigment.

Water-soluble proteins exhibited relatively intense green pigmentation, whereas water-insoluble ones showed negligible pigmentation. Taurine, a natural amino compound, which has a sulfonate group in place of the carboxyl group of an amino acid, also participated in pigment formation with thiosulfinates.

Other sulfonates with an amino group, including aminosulfonic acid and ptoluenesulfonamide, did not form pigment. This is the first time that the pigmentation of proteins, amino aldehydes, ammonia and taurine with thiosulfinates has been reported.”
“Infertility is a major reproductive health threat; the frequency of male infertility due to Y-chromosome microdeletions is 13-18% in the human population; these microdeletions involve recurrent loss of three non-overlapping regions designated as AZFa, AZFb and AZFc, associated with spermatogenic failure. Several contradictory reports have been this website published regarding deletion frequency based KU-57788 cost on sequence-tagged site markers and genotype-phenotype correlation. We examined the prevalence of Yq- deletion in 64 clinically diagnosed infertile male patients. We found a 3% frequency

of microdeletion of the AZFc region; hormone profiles (FSH, LH and testosterone) showed significantly (P < 0.001) elevated levels compared to controls. No mutations were observed in the AZFa and AZFb regions, perhaps due to the selective use of sequence-tagged site markers.”
“We consider a class of line-transformed cylindrical cloaks which have easily realizable constitutive parameters. The scattering properties of such cloaks have been investigated numerically for both transverse-electric and transverse-magnetic incidences of plane waves. A line-transformed invisibility cloak with a perfectly electric conducting (PEC) inner boundary is actually a reshaping of a PEC line to which the cloaked object is crushed. The numerical results of near-field distributions and far-field scattering properties have verified the above conclusions. We also investigate the relationship between the constitutive parameters of a line-transformed cloak and the length of the corresponding line. The changing range of constitutive parameters is large when the line is short, while the changing range becomes small when the line is long.

Results Six patients with lateral screw direction after a DVR ma

Results. Six patients with lateral screw direction after a DVR maneuver required screw removal because of proximity to the aorta. All patients had intraoperative confirmation of adequate screw placement before

introducing the rod and performing derotation.

Conclusions. The biologic limitations of vertebrae are approached as we strive to achieve further correction of the spine. Surgeons’ experience and methods to assess proper screw placement may give a false sense of adequate final implant position after DVR. Vigilance to ensure proper pedicle screw position can avoid potential iatrogenic catastrophes.”
“Study Design. A multicenter prospective cohort study.

Objective. To compare CYT387 order the effect of all pedicle screw versus hybrid constructs on patient self-assessment of appearance after posterior spinal fusion with instrumentation for adolescent idiopathic scoliosis (AIS). This will contribute to future cost-effective analyses on surgical management of AIS.

Summary of Background Data. For surgical management of AIS, the Spinal Appearance Questionnaire (SAQ) and the Scoliosis Research Society outcomes instrument (SRS-30) are

reliable surveys of patient satisfaction, but neither tool has been used to assess outcome by implant type.

Methods. Patients received either all pedicle screws or hybrid instrumentation. Self-assessment of appearance pre- and after surgery was measured by SAQ and SRS-30. Statistical significance was evaluated through P values (P < 0.01 in the SAQ, P < 0.05 in the SRS-30) and effect Selleckchem JQEZ5 sizes.

Results. There were 93 patients in the all

pedicle screw cohort and 61 in the hybrid cohort. There were no significant preoperative differences between the cohorts in the SAQ or SRS-30. All pedicle screw patients tended to see more improvement in shoulder level than hybrid patients in 2 separate S3I-201 SAQ questions (P = 0.025, Cohen’s D = 0.20; P = 0.013, D = 0.24). The screw patients also tended to have better scores than hybrid patients in the category, “”looking better in clothes”" (P = 0.017, V = 0.24) at 2 years postoperative. All pedicle screw patients self-reported significant greater improvement than hybrid patients in the SRS-30 Appearance and Mental domains (P = 0.016, ES = 0.038; P = 0.005, ES = 0.051). There were no significant differences between cohorts in age, gender, baseline curve, or major curve magnitude.

Conclusion. All pedicle screw constructs lead to better self-assessment of appearance in operative treatment of AIS, as determined by SAQ and SRS-30.”
“Study Design. This is a prospective in vivo study comparing radiation exposure to the surgeon during 10 minimally invasive lumbar microdiscectomy cases with 10 traditional open discectomy cases as a control.

Objective.

Electrical measurements on the OSFG nanowire devices showed stati

Electrical measurements on the OSFG nanowire devices showed static-induction transistorlike behavior in the drain output I(DS)-V(DS) characteristics and a hysteresis window as large as similar to 3.1 V in the gate transfer I(DS)-V(GS) characteristics. This behavior is ascribed to the presence of the CdTe nanocrystals, and is indicative of the trapping and emission of electrons in the 5-Fluoracil research buy nanocrystals. The numerical simulations clearly show qualitatively the same characteristics as the experimental data and confirm the effect,

showing that the change in the potential distribution across the channel, induced by both the wrapping-around gate and the drain, affects the transport characteristics of the device. The cross-sectional energy band and potential profile of the OSFG channel Nirogacestat corresponding to the “”programed (noncharged)”" and “”erased (charged)”" operations for the device are also discussed on the basis of the numerical capacitance-voltage simulations.”
“The pharmacokinetics properties of marbofloxacin were studied in adult Eurassian Griffon vulture after single-dose intravenous (IV) administration of 2 mg/kg. Drug concentration in plasma was determined by high-performance liquid chromatography and the data obtained were subjected to compartmental and non-compartmental

kinetic analysis. Marbofloxacin presented a volume of distribution at steady-state (Vdss) of 1.51 +/- 0.22 L and total plasma clearance (Cl) of 0.109 +/- 0.023 L/h kg. The permanence of this drug was long in vultures (T(1/2 lambda) = 12.51 +/- 2.52 h; MRT(infinity) = 13.54 +/- 2.29 h). The optimal dose of marbofloxacin estimated is 2.73 mg/kg per day for the treatment of infections in vultures with MIC(90) = 0.2 mu g/mL Published by Elsevier Ltd.”
“Adalimumab is a fully human, recombinant, monoclonal IgG1 antibody specific for the cytokine tumor necrosis factor-alpha. It www.selleckchem.com/products/epz004777.html is approved for the treatment of patients with inflammatory diseases, including adults with moderately to severely active ulcerative colitis who are refractory

to, or intolerant of, corticosteroids and/or immunomodulators. In two well-designed 8- and 52-week clinical trials in patients with moderately to severely active ulcerative colitis despite treatment with corticosteroids and/or immunomodulators, subcutaneous adalimumab (160 mg, week 0; 80 mg, week 2; 40 mg every other week starting at week 4) was more effective than placebo for inducing and maintaining clinical remission. A statistically significant effect size (albeit < 10 %) over placebo for the remission per Mayo score (primary endpoint) was observed with adalimumab at 8 weeks in both trials and at 52 weeks in one trial. Compared with placebo, adalimumab was associated with reductions in hospitalizations and improvements in other secondary endpoints, including clinical response, mucosal healing, corticosteroid-sparing, and health-related quality of life measures.

Bronchoalveolar lavage (BAL) was performed and cell counts record

Bronchoalveolar lavage (BAL) was performed and cell counts recorded. Direct skin tests were performed to assess skin reactivity to allergen and passive cutaneous anaphylaxis (PCA) tests were performed to determine titres of circulating IgE. Results: In a population of allergic rabbits, allergen challenge induced a significant bronchoconstriction, airway inflammation and BHR Skin test responsiveness to allergen did not correlate with various indices of pulmonary mechanics e.g. baseline sensitivity to methacholine and histamine, or allergen-induced BHR. In contrast, skin test responsiveness. Caspase inhibitor did predict airway inflammation as assessed by measurements of eosinophil

recruitment to the lung. Conclusion: The allergic rabbit is a useful model to further our understanding of allergic diseases. Recording lung function using a minimally invasive procedure allows repeated measurements to be made in rabbits longitudinally, and each animal may thus be used as its own control. Our

observations do not support EPZ 6438 the use of skin responsiveness to allergen as a predictor of airway sensitivity as we observed no correlation between skin sensitivity and airway responsiveness to inhaled histamine, methacholine or allergen. However, skin reactivity did predict airway inflammation as assessed by measurements of eosinophil recruitment to the lung. Our results also further highlight the likely dissociation between airway inflammation

and BHR. (C) 2011 Elsevier Inc. All rights reserved.”
“The aim of this study is to evaluate the oral colonization by Candida albicans in experimental murine immunosuppressed DBA/2 and treatment with probiotic bacteria. To achieve these objectives, 152 DBA/2-immunosuppressed mice were orally inoculated with a suspension of C. albicans containing 10(8) viable yeast cells, the animals were treated with nystatin or with the probiotics (Lactobacillus acidophilus and Lactobacillus rhamnosus). Evaluations were performed by Candida count from oral Ulixertinib clinical trial mucosa swabbing. The oral mucosa colonization by C. albicans started at day 1 after inoculation, remained maximal from day 3 until day 7, and then decreased significantly. Probiotics reduced the C. albicans colonization significantly on the oral mucosa in comparison with the untreated animal group. In the group treated with L. rhamnosus, the reduction in yeast colonization was significantly higher compared with that of the group receiving nystatin. Immunosuppressed animal model DBA/2 is a relevant model for experimental Candida oral colonization, and the treatment with probiotics in this model may be an effective alternative to prevent it. Oral Diseases (2012) 18, 260-264″
“Objective: To report a novel pioneering approach of endoscopic embolization (EE) and resection of juvenile nasopharyngeal angiofibroma (JNA) and describe all outcomes and results.

Group 3 defects showed higher amounts of newly formed bone (37 89

Group 3 defects showed higher amounts of newly formed bone (37.89%) than the defects of all the other

groups (P < 0.05). The amounts of new bone in defects of groups 1 and 4 were not significantly different from each other (24.00% and 24.75%, respectively), but were significantly different from the amounts in the other groups (P < 0.05). The amounts of new bone in the defects of groups 2 and 5 were not significantly different from each other (31.42% and 31.96%, respectively), but were significantly different from the amounts in the other groups (P < 0.05). Group 6 defects had 14.10% new bone formation, and this was significantly different from the amounts in the other groups (P < 0.05). It can be concluded that LLLI administered during surgery effectively accelerated healing of critical bone defects filled with pure rhBMP-2, achieving a better result than LLLI alone or the use of rhBMP-2 alone.”
“Background and objective: HDAC inhibitor Because the mortality and social burden associated with COPD is increasing, repeated surveys of the prevalence of COPD have been used to assess

risk factors, detect potential patients, and establish early diagnoses and management protocols. We report the prevalence of spirometrically detected COPD in Korea in 2008, using data from the fourth Korean National Health and Nutrition Survey.

Methods: BEZ235 concentration Using nationwide stratified random sampling, based on the Korean Statistical Office census, 6840 subjects aged >= 19 years underwent spirometry, which was performed by four trained technicians, during 2008. The place of residence, levels of education and income and smoking status, as well as other results from a COPD survey questionnaire were also assessed.

Results: Airflow obstruction (FEV(1)/FVC < 0.7) was detected in 8.8% of subjects aged >= 19 years (11.6% of men and 5.9% of women) and COPD was detected in 13.4% of subjects aged >= 40 years (19.4% of men and 7.9% of women). Of the 6840 subjects, 27.3% were current smokers and 17.2% were former smokers, and the prevalence of COPD was higher in current and former smokers than in never smokers.

Approximately 94% of patients with COPD had mild-to-moderate disease, without apparent symptoms; only 4EGI-1 Others inhibitor 2.4% had been diagnosed by a physician and only 2.1% of patients had been treated. The independent risk factors for COPD were smoking, advanced age and male gender.

Conclusions: Although the prevalence of COPD in Korea is high, the disease is underdiagnosed and most COPD patients are under-treated.”
“Bariatric revision surgery is associated with several complications that can be attributed to decreased quality of tissue and complexity of the surgery. A laparoscopic sleeve gastrectomy is a simple technique with potential advantages. Therefore, the results of this procedure were evaluated as a revisional option. Fifty-one patients underwent laparoscopic sleeve gastrectomy (LSG).

(C) 2011 American Institute of Physics [doi:10 1063/1 3608130]“<

(C) 2011 American Institute of Physics. [doi:10.1063/1.3608130]“
“To evaluate the scientific contribution of Brazilian Spine Surgeons not only in number of publications but also in their quality between January 2000 to December 2011.

A literature search of

publications by Brazilian spinal surgeons on topics concerning the spine or spinal cord was performed using an online database; Pubmed.gov. The results were limited to articles published from January 2000 to December 2011. A total of 1,778 articles were identified after www.selleckchem.com/products/tariquidar.html a Medline search. After exclusion criteria, the study comprised 206 articles. The quality of the Journals was assessed with IF and the article quality using the Oxford classification.

An increasing number of publications by Brazilian spine surgeons was observed in recent years: 45.1 % of those papers were published during the last 4 years (2008-2011).

Clinical studies and case reports were the most frequent types of article published (37.5 vs 31.1 %). An increasing number of Brazilian publications in non-Brazilian journals has been observed in recent years (linear-by-linear association: 5.449, P = 0.020). The Arquivos de Neuro-Psiquiatria was the most frequent journal in which the papers were published (N = 67, 32 %). The IF of the publications varied from 0.021 to 8.017. The analysis of quality of the articles using the Oxford classification demonstrated that most of them provided LOE 4 (N = 113, 54.9 %) or 5 (N = 45, 21.8 %).

There have been an increasing number of publications by Brazilian spine Selleckchem CCI-779 surgeons in recent years and the quality of the articles

published AZD8186 cell line has improved. Also the number of publications by Brazilians in non-Brazilian journals has increased in recent years.”
“Objective: The purpose of the study was to compare the psychological adjustment of caregivers of children with brain tumors who are on-treatment with caregivers of children who are off-treatment.

Methods: Data were collected from 90 participants: 47 (52.2%) caregivers of children undergoing active treatment (on-treatment) and 43 (47.8%) caregivers of children off-treatment on measures of global psychological distress and illness and caregiving related distress.

Results: Results revealed that the two groups differed significantly in their reported symptoms of general psychological distress, with the off-treatment caregivers reporting significantly lower levels of general distress. However, off-treatment caregivers continued to experience elevated levels of uncertainty and caregiving burden related to their child’s illness.

Conclusions: There is significant evidence suggesting that the burden of caring for a child with a brain tumor is ongoing, continuing well into the off-treatment period. These results also suggest that the psychosocial functioning of these caregivers is best assessed using measures designed specifically to evaluate illness-related psychosocial functioning (e.g.

Sixty-nine percent of patients (90/130) were in stable SR after a

Sixty-nine percent of patients (90/130) were in stable SR after a median period of 48 months, whereas 28% (36/130) were in AF and 3% (4/130) were in atrial flutter. In between the 12-month follow-up and the long-term follow-up, seven patients converted to AF after having documented SR, two patients converted to typical right atrial flutter after being in SR, and two patients from AF to left atrial macroreentry. After left and biatrial SICTRA, SR rates were comparable (73% vs 66%, P = 0.45). Echocardiography revealed 73% of patients in SR to have effective left atrial contraction.

Conclusions:

SICTRA restores long-term stable SR in 69% of all patients. Nine percent of patients reconverted back to atrial arrhythmia after having documented buy DAPT SR at 12 months. (PACE 2009; 32:653-659)”
“Background: One year after the adoption of artesunate-amodiaquine (AS/AQ) as first-line therapy for the treatment

of uncomplicated malaria, this study was designed to assess the treatment practices regarding anti-malarial drugs at health facilities in four rural areas in southern Cameroon.

Methods: Between April and August 2005, information was collected by interviewing fifty-two health professionals from twelve rural health facilities, using a structured questionnaire.

Results: In 2005, only three anti-malarial drugs were CHIR-99021 used in rural health facilities, including: amodiaquine, quinine and sulphadoxine-pyrimethamine. Only 2.0% of the health professionals prescribed the recommended AS/AQ combination. After reading the treatment guidelines, 75.0% were

in favour of the treatment protocol with the following limitations: lack of paediatric formulations, high cost and large number of tablets per day. Up to 21.0% of professionals did not prescribe AS/AQ because of the level of adverse events attributed to the use of amodiaquine as monotherapy.

Conclusion: The present study indicates that AS/AQ was not available in the public health facilities at the time of the study, and health practitioners were not informed about the new treatment guidelines. Results of qualitative analysis suggest that prescribers should Adriamycin be involved as soon as possible in projects related to the optimization of treatment guidelines and comply with new drugs. Adapted formulations should be made available at the international level and implemented locally before new drugs and treatments are proposed through a national control programme. This baseline information will be useful to monitor progresses in the implementation of artemisinin-based combination therapy in Cameroon.”
“PATHOWIKI (www.pathowiki.org) is a new specialized information system in the form of a web-based wiki with content from all sub-disciplines of human pathology. Essential components are articles and specimens which are located thematically in dermatopathology.

The patient’s symptoms immediately improved after the procedure,

The patient’s symptoms immediately improved after the procedure, with no procedure-related complications. The mean pressure gradient across the valve decreased to 19 mmHg, and the mitral valve area increased to 1.21 cm(2) in postprocedural echocardiography. We conducted a literature search and Selleckchem Dibutyryl-cAMP identified 26 cases of balloon valvuloplasty for degenerated bioprosthetic valves.

Of these, 14 cases were bioprosthetic mitral valves, and the results were favorable. However, more case reports are required to establish an evidence base for future expert recommendation of balloon valvuloplasty of prosthetic mitral valve. Meanwhile, balloon valvuloplasty will serve a niche role in highly selected patients with prosthetic mitral valve selleck screening library stenosis.”
“Guillain-Barr, syndrome (GBS) is well known as presenting with acute immune-mediated polyneuropathies, with strong associations with antecedent infections. Several variant forms of GBS have

been described, including acute inflammatory demyelinating polyneuropathy, acute motor axonal neuropathy, acute motor-sensory axonal neuropathy, and sensory GBS. We present a rare case of 2-year-old boy with acute motor and sensory polyneuropathy and left-sided facial nerve paralysis after rotavirus infection. He received immunoglobulin i.v. with subsequent satisfactory recovery.”
“Post-transplant malignancies present an aggressive course and are a significant cause of morbidity and mortality. Tumours of viral ethiology have the greatest risk in renal transplant recipients. Oncogenic effect of immunosuppressive therapy is another major risk factor of post-transplant malignancy. We report cases of three different types of malignancies developed after kidney BMS-777607 mouse transplantation: non-Hodgkin’s lymphoma, Kaposi’s sarcoma and germ cell testicular cancer (nonseminoma).”
“Objectives:To review the safety of biologic agents used to treat rheumatoid arthritis (RA) and other autoimmune diseases, with a focus on rituximab.

Methods: Information was gathered from a search of the PubMed database and from major congress abstract

listings through June 2007.

Results: Rituximab is approved for treating RA in patients with an inadequate response to TNF inhibitors and is under Study in other indications for RA and other autoimmune disorders. The Current safety profile of rituximab in RA is known from Phase II and III Studies conducted preapproval, treating approximately 750 patients, as well as from long-term extension studies with repeated therapy. Clinical trials have established that the most common adverse events are infusion-associated reactions, seen In 29 to 40% of patients, most of which are mild to moderate and Occur following the first rituximab infusion, with incidence and severity decreasing with subsequent infusions.

The constant parallel improvements in both microarray

and

The constant parallel improvements in both microarray

and sample amplification techniques in the near future may lead to a radical progression in medical diagnostics and systems for efficient detection of microorganisms in the environment.”
“It remains controversial as to whether neonatal seizures have additional direct effects on the developing brain separate from the severity of the underlying encephalopathy. Using data collected from infants diagnosed with hypoxic-ischemic encephalopathy, and who were enrolled in an National Institute of Child Health and Human Development trial of hypothermia, we analyzed associations between neonatal clinical seizures and outcomes at 18 months of age.

Of the 208 infants enrolled, 102 received whole body hypothermia and 106 were controls. Clinical seizures MEK inhibitor were generally noted during the first 4 days of life and rarely afterward. When adjustment was made for study treatment and severity of encephalopathy, seizures were not associated with death, or moderate or severe disability, or lower Bayley Mental Development Index scores at 18 months of life. Among infants diagnosed with hypoxic-ischemic encephalopathy, the mortality and morbidity often attributed to neonatal seizures can be better explained by the underlying severity of encephalopathy.”
“The (Au,Ag)/Nb-1.0 wt %-doped SrTiO3 (NSTO), i.e., Au/NSTO, Ag/NSTO, selleck Ag/Au/NSTO, and Au/Ag/NSTO junctions were fabricated by magnetic controlled sputtering and annealing process. Backward diodelike behaviors were observed in all as-prepared samples, and forward rectifying characteristics were gradually developed in the four junctions after annealed in oxygen at 400 degrees C, 550 degrees C, 700 degrees C, and 850 degrees C, respectively. Compared with the Ag/NSTO junctions, the Au/NSTO junctions showed higher temperature evolving procedure

of forward rectifying behavior. Moreover, ideal Schottky behaviors appeared in the samples annealed at 850 degrees C, which were attributed to the formation of interface states. X-ray photoelectron spectroscopy and secondary ion mass spectrometry analysis showed that PD0332991 purchase the interface states mainly originated from the migration of metal into NSTO matrix and the changes in chemical composition at the metal/NSTO interfaces. The results of current-voltage measurements reveal that annealing at higher temperature alters the interface barrier and thereby ameliorates the stability of leakage current remarkably. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3512866]“
“The use of microarray and comparative genomic technologies for the analysis of host-pathogen interactions has led to a greater understanding of the biological systems involved in infectious disease processes.