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Biomedical subjects

John Wright

Publications and source records attributed to John Wright.

At least 55 records · Page 3Linked to original sources
PubMed2005

Survival following total hip replacement.

BACKGROUND: Several studies have shown that patients who undergo total hip replacement live longer than control subjects, but the reason for this apparent protective effect is not clear. The purpose of our investigation was to assess whether the association had the characteristics of a causal relationship or whether it might appear to be due to comorbidity or other factors. METHODS: We compared survival over a six-year period for 28,469 Medicare enrollees who had elective primary total hip replacement in 1996 and a control group from the general Medicare population, matched 5:1 on year of birth, sex, race, and whether the Medicaid program paid the Medicare premium (a proxy for low income). For both the patients treated with total hip replacement and the control subjects, we used Medicare hospital claims to ascertain comorbidity, that is, whether the patient had had any of sixteen serious discharge diagnoses in the year prior to the total hip replacement (or an equivalent date for the controls). The survival patterns for the total hip arthroplasty and control cohorts were compared with use of proportional hazards regression for three follow-up periods: the first ninety days after surgery (or an equivalent date for the controls), ninety days to five years after surgery, and more than five years after surgery. RESULTS: The total hip replacement cohort had less comorbidity than the controls, with an approximately 30% lower prevalence for most serious diseases. Sex, age, Medicaid eligibility, and earlier serious comorbid diagnoses were important predictors of survival, but, even in analyses that adjusted for these variables, the total hip replacement cohort had better long-term survival than the controls. The patients who had a total hip replacement had a higher rate of mortality than the controls immediately after surgery, but, by three months postoperatively, the mortality rate for the patients was well below that for the controls. The overall rate of survival during the first ninety days was comparable for the two groups. From three months to five years after surgery, the mortality rate for the patients who had a total hip replacement was only two-thirds of that for the controls. After five years, the mortality rates for the two groups appeared to be converging. CONCLUSIONS: Total hip replacement recipients survive longer than do matched controls in the Medicare population. The very rapid emergence of the lower mortality rate suggests that it is due to the selection of low-risk patients for elective surgery. However, our admittedly crude adjustment for comorbidity did not diminish the protective effect, so some effect of the procedure itself cannot be ruled out.

Aged↗
PubMed2005

Epidemiology of total knee replacement in the United States Medicare population.

BACKGROUND: There are limited population-based data on the utilization and outcomes of total knee replacement. The aim of the present study was to describe the rates of primary and revision total knee replacement and selected outcomes in persons older than sixty-five years of age in the United States. METHODS: Using Medicare claims, we computed annual incidence rates of unilateral elective primary and revision total knee replacement among United States Medicare beneficiaries in the year 2000. Poisson regression was used to assess the relationships between demographic characteristics and the incidence rates of primary and revision knee replacement. Proportional hazards models were used to examine the relationships between the ninety-day rates of complications and demographic and clinical factors. RESULTS: The rate of primary knee replacement was lower in blacks than in whites and in those qualifying for Medicaid supplementation than in those with higher incomes. The complications observed during the ninety days following primary knee replacement included mortality (0.7%), readmission (0.9%), pulmonary embolus (0.8%), wound infection (0.4%), pneumonia (1.4%), and myocardial infarction (0.8%). The complications observed during the ninety days following revision knee replacement were mortality (1.1%), readmission (4.7%), pulmonary embolus (0.5%), wound infection (1.8%), pneumonia (1.4%), and myocardial infarction (1.0%). Blacks had higher rates of mortality, readmission, and wound infection after primary knee replacement than whites did. Patients who qualified for Medicaid supplementation had higher complication rates, particularly after primary knee replacement. CONCLUSIONS: Overall, the rates of postoperative complications during the ninety days following total knee replacement are low. In the United States, blacks and individuals with low income undergo total knee replacement less frequently and generally have higher rates of adverse outcomes following primary knee replacement.

Aged↗
PubMed2005

Religious beliefs about causes and treatment of epilepsy.

BACKGROUND: It has been acknowledged that religious and complementary therapies are commonly used among South Asian communities in the UK. However, little is known about their religious beliefs in relation to epilepsy and the type of South Asian therapies that they use to treat the condition. AIM: To explore the influences of spiritual and religious beliefs on explanation of the cause of epilepsy, and the choice of treatment in people of South Asian origin who have epilepsy. DESIGN OF STUDY: Qualitative study using interviews with patients, carers, health professionals, and focus groups of people from minority ethnic communities. SETTING: Bradford and Leeds. METHOD: Semi-structured individual interviews with 20 Muslims, six Sikhs, and four Hindus with epilepsy; 16 nominated carers (family members, friends); 10 health professionals (specialist GPs, neurologists, specialists nurses, social workers, community GPs); and two focus groups with a total of 16 South Asians without epilepsy. RESULTS: It was found that over half of responders attributed their illness to fate and the will of God, or as punishment for sins of a past life. Some patients had experienced prejudice from people who believed that their epilepsy was contagious. A strong network of traditional healers was found, providing a parallel system of health care in the UK and on the Indian subcontinent. People turned to religiospiritual treatments in desperation for a cure, often under the influence of their families after the perceived failure of Western medicine. Such treatments were viewed as complementary rather than as an alternative to Western medication. Younger people in particular expressed considerable scepticism about the effectiveness of these traditional South Asian treatments. CONCLUSIONS: In this study's South Asian sample, patients commonly turned to traditional healers in search of better health. Health professionals should be aware of the belief systems of these patients and understand the types of treatments in common use. Although these treatments might potentially compete with Western health care, they are used as an adjunct rather than a substitute. Patients have a 'healthy' scepticism about the effectiveness of such treatments, and adherence to medical therapy does not appear to be affected.

Adolescent↗
PubMed2004

Phase II clinical experience with the novel proteasome inhibitor bortezomib in patients with indolent non-Hodgkin's lymphoma and mantle cell lymphoma.

PURPOSE: To determine the antitumor activity of the novel proteasome inhibitor bortezomib in patients with indolent and mantle-cell lymphoma (MCL). PATIENTS AND METHODS: Patients with indolent and MCL were eligible. Bortezomib was given at a dose of 1.5 mg/m2 on days 1, 4, 8, and 11. Patients were required to have received no more than three prior chemotherapy regimens, with at least 1 month since the prior treatment, 3 months from prior rituximab, and 7 days from prior corticosteroids; absolute neutrophil count more than 1,500/microL (500/microL if documented bone marrow involvement); and platelet count more than 50,000/microL. RESULTS: Twenty-six patients were registered, of whom 24 were assessable. Ten patients had follicular lymphoma, 11 had MCL, three had small lymphocytic lymphoma (SLL) or chronic lymphocytic leukemia (CLL), and two had marginal zone lymphoma. The overall response rate was 58%, with one complete remission (CR), one unconfirmed CR (CRu), and four partial remissions (PR) among patients with follicular non-Hodgkin's lymphoma (NHL). All responses were durable, lasting from 3 to 24+ months. One patient with MCL achieved a CRu, four achieved a PR, and four had stable disease. One patient with MCL maintained his remission for 19 months. Both patients with marginal zone lymphoma achieved PR lasting 8+ and 11+ months, respectively. Patients with SLL or CLL have yet to respond. Overall, the drug was well tolerated, with only one grade 4 toxicity (hyponatremia). The most common grade 3 toxicities were lymphopenia (n = 14) and thrombocytopenia (n = 7). CONCLUSION: These data suggest that bortezomib was well tolerated and has significant single-agent activity in patients with certain subtypes of NHL.

Adult↗
PubMed2004

What's the evidence that NICE guidance has been implemented? Results from a national evaluation using time series analysis, audit of patients' notes, and interviews.

OBJECTIVES: To assess the extent and pattern of implementation of guidance issued by the National Institute for Clinical Excellence (NICE). DESIGN: Interrupted time series analysis, review of case notes, survey, and interviews. SETTING: Acute and primary care trusts in England and Wales. PARTICIPANTS: All primary care prescribing, hospital pharmacies; a random sample of 20 acute trusts, 17 mental health trusts, and 21 primary care trusts; and senior clinicians and managers from five acute trusts. MAIN OUTCOME MEASURES: Rates of prescribing and use of procedures and medical devices relative to evidence based guidance. RESULTS: 6308 usable patient audit forms were returned. Implementation of NICE guidance varied by trust and by topic. Prescribing of some taxanes for cancer (P < 0.002) and orlistat for obesity (P < 0.001) significantly increased in line with guidance. Prescribing of drugs for Alzheimer's disease and prophylactic extraction of wisdom teeth showed trends consistent with, but not obviously a consequence of, the guidance. Prescribing practice often did not accord with the details of the guidance. No change was apparent in the use of hearing aids, hip prostheses, implantable cardioverter defibrillators, laparoscopic hernia repair, and laparoscopic colorectal cancer surgery after NICE guidance had been issued. CONCLUSIONS: Implementation of NICE guidance has been variable. Guidance seems more likely to be adopted when there is strong professional support, a stable and convincing evidence base, and no increased or unfunded costs, in organisations that have established good systems for tracking guidance implementation and where the professionals involved are not isolated. Guidance needs to be clear and reflect the clinical context.

Female↗
PubMed2004

A phase 1 and pharmacodynamic study of depsipeptide (FK228) in chronic lymphocytic leukemia and acute myeloid leukemia.

Preclinical studies with the histone deacetylase (HDAC) inhibitor depsipeptide (FK228) in chronic lymphocytic leukemia (CLL) and acute myeloid leukemia (AML) have demonstrated that it effectively induces apoptosis at concentrations at which HDAC inhibition occurs. We initiated a minimum effective pharmacologic dose study of depsipeptide, targeting an in vivo dose at which acetylation of histone proteins H3 and H4 increased by 100% or more in vitro. Ten patients with CLL and 10 patients with AML were treated with 13 mg/m(2) depsipeptide intravenously days 1, 8, and 15 of therapy. Neither life-threatening toxicities nor cardiac toxicities were noted, although the majority of patients experienced progressive fatigue, nausea, and other constitutional symptoms that prevented repeated dosing. Several patients had evidence of antitumor activity following treatment, but no partial or complete responses were noted by National Cancer Institute criteria. HDAC inhibition and histone acetylation increases of at least 100% were noted, as well as increases in p21 promoter H4 acetylation, p21 protein, and 1D10 antigen expression. We conclude that depsipeptide effectively inhibits HDAC in vivo in patients with CLL and AML, but its use in the current schedule of administration is limited by progressive constitutional symptoms. Future studies with depsipeptide should examine alternative administration schedules.

Aged↗
PubMed2004

Phase II study of the proteasome inhibitor bortezomib (PS-341) in patients with metastatic neuroendocrine tumors.

PURPOSE: This phase II study was undertaken to assess objective response, toxicity, tumor marker response, and pharmacodynamics of bortezomib in patients with metastatic neuroendocrine (carcinoid and islet cell) tumors. EXPERIMENTAL DESIGN: A total of 16 patients with measurable metastatic carcinoid (n=12) or islet cell (n=4) tumors received i.v. bolus of single agent bortezomib at a dose of 1.5 mg/m2 on days 1, 4, 8, and 11 every 21 days. Tumor response was assessed at 12-week intervals using Response Evaluation Criteria in Solid Tumors (RECIST) criteria. All patients were chemotherapy naïve and had Eastern Cooperative Oncology Group performance status of 0 to 1. RESULTS: No patient achieved a partial or a complete remission. The patients received total of 264 doses of therapy with a median of 15 doses per patient. Grade 4 toxicities were not observed. The most common grade 3 adverse events included peripheral sensory neuropathy (37%), diarrhea (25%), vomiting (18%), and ileus (18%). Six of 10 patients who experienced grade 2 to 3 peripheral sensory neuropathy also had grade 2 to 3 dizziness (n=2), orthostatic hypotension (n=2), syncope (n=1), ileus (n=2), or abdominal cramps (n=1). Changes in tumor marker levels did not correlate with tumor response. The mean percentage of 20S proteasome inhibition achieved in whole blood at 1 and 24 hours after bortezomib administration was 68 and 30%, respectively. CONCLUSIONS: Despite achieving the surrogate biologic end point, single-agent bortezomib did not induce any objective responses in patients with metastatic carcinoid or islet cell tumors. Additional investigation is warranted to clarify the possible association of autonomic neuropathy with bortezomib.

Adult↗
PubMed2004

State of the translational science: summary of Baltimore workshop on gene re-expression as a therapeutic target in cancer January 2003.

A workshop was held in Baltimore, Maryland in January 2003 to discuss translational aspects of cancer therapies targeted at impacting aberrant gene transcription due to epigenetic changes. The mission of the meeting was the development of strategies for scientifically sound, clinically feasible applications targeting epigenetics in cancer therapy. Sessions included preclinical discussions of DNA methylation, the histone code, chromatin remodeling, and transcriptional control. Data on the histone deacetylase and DNA methyltransferase inhibitors under preclinical and clinical investigation were presented and discussed. The optimal correlative laboratory studies for monitoring clinical trials with these agents remain controversial. DNA methyltransferase and histone deacetylase inhibitors will be combined with each other to maximally re-express genes silenced through promoter methylation. Other classes of agents that may be rationally combined with these classes of drugs include retinoids, steroid hormones, and cytotoxic drugs.

Acetylation↗
PubMed2004

Hospital at home for patients with acute exacerbations of chronic obstructive pulmonary disease: systematic review of evidence.

OBJECTIVES: To evaluate the efficacy of hospital at home schemes compared with inpatient care in patients with acute exacerbations of chronic obstructive pulmonary disease (COPD). DESIGN: A systematic review of randomised controlled trials. MAIN OUTCOME MEASURE: Mortality and readmission to hospital. RESULTS: Seven trials with 754 patients were included in the review. Hospital readmission and mortality were not significantly different when hospital at home schemes were compared with inpatient care (relative risk 0.89, 95% confidence interval 0.72 to 1.12, and 0.61, 0.36 to 1.05, respectively). However, compared with inpatient care, hospital at home schemes were associated with substantial cost savings as well as freeing up hospital inpatient beds. CONCLUSIONS: Hospital at home schemes can be safely used to care for patients with acute exacerbations of COPD who would otherwise be admitted to hospital. Clinicians should consider this form of management, especially as there is increasing pressure for inpatient beds in the United Kingdom.

Acute Disease↗
PubMed2004

Phase I study of bortezomib in refractory or relapsed acute leukemias.

Bortezomib (Velcade, formerly PS-341) is proteasome inhibitor with documented antitumor activity in multiple myeloma and other lymphoid malignancies. We performed a Phase I study to investigate the maximum tolerated dose and dose-limiting toxicity of bortezomib in patients with acute leukemias refractory to or relapsing after prior therapy. Fifteen patients were treated with 0.75 (n = 3), 1.25 (n = 7), or 1.5 (n = 5) mg/m(2) bortezomib administered twice weekly for 4 weeks every 6 weeks. Dose-limiting toxicity included orthostatic hypotension (n = 2), nausea (n = 2), diarrhea (n = 1), and fluid retention (n = 1), all at 1.5 mg/m(2) bortezomib. Proteasome inhibition was dose dependent and reached 68% at 1.5 mg/m(2) bortezomib. Peak inhibition was observed 1 h after treatment and returned to near baseline levels by 72 h after treatment. Incubation of blast cells with bortezomib in vitro showed induction of apoptosis in three of five patients investigated. We conclude that the maximum tolerated dose of bortezomib in patients with acute leukemia is 1.25 mg/m(2), using a twice-weekly for 4 weeks every 6 weeks schedule. The in vitro evidence of antileukemia and transient hematological improvements observed in some patients warrants further investigation of bortezomib in acute leukemias, probably in combination with other agents.

Adolescent↗
PubMed2004

Which patients with knee problems are likely to benefit from nonarthroplasty surgery? Development of a clinical prediction rule.

BACKGROUND: We examined factors associated with the clinical presentation of patients judged likely by orthopedic surgeons to benefit from nonarthroplasty knee surgery. METHODS: Consecutive patients presenting to orthopedic surgeons were eligible for the study and 103 were recruited. A trained research assistant took histories, performed physical examinations, and administered a standardized questionnaire. Surgeons provided diagnoses and, in each case, rated their confidence that nonarthroplasty knee surgery would help the patient. We assessed the relationship between patient characteristics and the orthopedic surgeon's level of confidence that the patient was likely to benefit from knee surgery. RESULTS: In multivariable logistic regression models, the following characteristics were associated with a surgeon's judgment that a patient would likely benefit from knee surgery: a history of sports-related trauma, low functional status, limited knee flexion or extension, medial or lateral knee joint line tenderness, a click or pain noted with the McMurray test, and a positive Lachmann or anterior drawer test (c statistic from model, 0.83). These items were combined into a clinical prediction score, and low-, medium-, and high-risk categories were identified. Independent evaluation by surgeons indicated that only 8% of patients in the low-risk category but 84% of patients in the high-risk category were judged likely to benefit from surgery (P for trend <.001). CONCLUSION: Using a small group of easily accessible patient characteristics, we developed a clinical prediction score that clearly differentiated patients who were viewed by experienced orthopedic knee surgeons as likely or not likely to benefit from nonarthroplasty knee surgery.

Adult↗
PubMed2004

Biweekly 72-hour 9-aminocamptothecin infusion as second-line therapy for ovarian carcinoma: phase II study of the New York Gynecologic Oncology Group and the Eastern Cooperative Oncology Group.

PURPOSE: To determine the antitumor activity of the novel topoisomerase I inhibitor 9-aminocamptothecin (9-AC) given over 72 hours every 2 weeks in patients with ovarian carcinoma previously treated with one platinum-containing regimen. PATIENTS AND METHODS: Patients with ovarian carcinoma who received one prior platinum-containing regimen were eligible. Patients were stratified based on whether their disease was measurable, or nonmeasurable but assessable. 9-AC 35 microg/m(2)/h was administered by continuous infusion for 72 hours every 2 weeks via ambulatory pump. RESULTS: Sixty patients were entered, 32 with measurable and 28 with nonmeasurable but assessable disease. Ten (16.7%) of 60 patients responded (95% CI, 7.2% to 26.1%), with four complete responses and six partial remissions. The response rate for patients with measurable and nonmeasurable but assessable disease was 22% (95% CI, 7.6% to 36.2%) and 10.7% (95% CI, 2.3% to 28.2%), respectively. None of the responders were platinum-resistant. Nineteen patients (32%) had stable disease. The major toxicities were hematologic, with 25% of patients having grade 3 and 35% having grade 4 neutropenia, including five episodes of febrile neutropenia, 17% having grade 3 to 4 thrombocytopenia, and 27% having grade 3 to 4 anemia. Nonhematologic toxicity included grade 3 to 4 nausea (27%) and grade 3 to 4 vomiting (12%). CONCLUSION: This phase II multicenter trial of biweekly 72 hour 9-AC infusion as second-line therapy for ovarian cancer demonstrates comparable activity to standard approved agents in patients with both measurable and nonmeasurable but assessable disease. Toxicity consists mainly of moderate but controllable myelosuppression. Further studies combining 9-AC with other agents active in ovarian cancer for use as second-line therapy are warranted.

Adult↗
PubMed2004

The significance of "nonsignificance" in randomized controlled studies: a discussion inspired by a double-blinded study on St. John's wort (Hypericum perforatum L.) for premenstrual symptoms.

OBJECTIVES: This study aimed to investigate the efficacy of St. John's wort extract (SJW) as a treatment for premenstrual symptoms. DESIGN: The study was a randomized, double-blinded, placebo-controlled trial, with two parallel treatment groups. After a no-treatment baseline cycle, volunteers were randomized to either SJW or placebo for a further two menstrual cycles. SETTINGS/LOCATION: A postal trial conducted from The University of Reading, Berkshire, England. SUBJECTS: One hundred and sixty-nine (169) normally menstruating women who experienced recurrent premenstrual symptoms were recruited onto the study. One hundred and twenty-five (125) completed the protocol and were included in the analysis. INTERVENTIONS: Six hundred milligrams (600) mg of SJW (standardized to contain 1800 microg of hypericin) or placebo (containing lactose and cellulose). OUTCOME MEASURE: A menstrual diary was used to assess changes in premenstrual symptoms. The anxiety-related subgroup of symptoms of this instrument was used as the primary outcome measure. RESULTS: After averaging the effects of treatment over both treatment cycles it was found that there was a trend for SJW to be superior to placebo. However, this finding was not statistically significant. CONCLUSION: The possibility that this nonsignificant finding resulted from insufficient statistical power in the study, rather than a lack of efficacy of SJW, is discussed. Following this discussion the recommendation is made that, in future, similar studies should be powered to detect a minimum clinically relevant difference between treatments.

Adult↗
PubMed2004

Effective treatment of osteomyelitis with biodegradable microspheres in a rabbit model.

Biodegradable microspheres were manufactured from a high molecular weight copolymer of 50% lactic and 50% glycolic acid and the antibiotic tobramycin. It was hypothesized that the microspheres would be more effective than polymethylmethacrylate beads in the local delivery of tobramycin and that the microspheres would not inhibit bone healing. Osteomyelitis was established in 40 New Zealand White rabbits using Staphylococcus aureus. All animals had irrigation and debridement of the infected radii four weeks after inoculation and were divided into five treatment groups: debridement alone, microspheres alone, microspheres containing tobramycin plus parenteral treatment with cefazolin, polymethylmethacrylate beads containing tobramycin plus parenteral cefazolin, and parenteral cefazolin. All animals were sacrificed after 4 weeks of treatment. The group treated with microspheres plus parenteral antibiotics was the only group to have a significantly higher percentage of animals without bacteria after 4 weeks of treatment when compared with the control group. Additionally, the animals treated with microspheres had a higher degree of bone healing in the defect than the animals treated with bone cement. The most effective treatment was biodegradable microspheres combined with parenteral antibiotic in this rabbit osteomyelitis model.

Animals↗
PubMed2004

Direct observation of treatment for tuberculosis: a randomized controlled trial of community health workers versus family members.

We implemented community-based direct observation of treatment, short course (DOTS), including a randomized controlled trial of direct observation either by community health workers (CHWs) or family members, under operational conditions in a region of Swaziland. There was a high death rate of 15%, due to the high HIV rates in the region. There was no significant difference in the cure and completion rate between direct observation of treatment by CHWs and family members [2% difference (95% CI -3% to 7%), exact P = 0.52]. A before-and-after comparison of outcomes demonstrated that the cure and treatment completion rate improved from a baseline of 27-67% following implementation of community-based DOTS. We conclude that community-based tuberculosis DOTS can improve successful outcomes of treatment. However, direct observation can be undertaken effectively using either daily family or CHW supervision. The choice of treatment supporter should be based on access, patient preference and availability of CHW resource.

Adolescent↗
PubMed2004

Self-destructive and delinquent behaviors of adolescent female victims of child sexual abuse: rates and covariates in clinical and nonclinical samples.

Self-destructive and delinquent behaviors were assessed in three samples of adolescent females. The first sample (N=140) were substantiated victims of sexual abuse recruited from clinical settings. They were contrasted to a second sample (N=430) of secondary school students, and a third sample from the same school setting (N=94), that reported that they had been sexually abused. Few differences were found between the two groups of sexually abused girls, and both groups reported significantly more at-risk behaviors than nonabused girls. Family adversity was a consistent predictor of both self-destructive and delinquent behaviors. However, violence during the abuse, lower quality mother-daughter relationships, and depression were also related to self-destructive behaviors, while family economic problems and self-blame for the abuse were the only correlates of delinquent behavior.

Adolescent↗
PubMed2004

Corticosteroid treatment does not reactivate canine herpesvirus in red foxes.

To study canine herpesvirus (CHV) reactivation from red foxes (Vulpes vulpes), 29 foxes with varying CHV antibody and CHV carrier status were treated with methylprednisolone acetate, a glucocorticosteroid drug with prolonged immunosuppressive effect in dogs. In the first experiment, 17 foxes with unknown CHV carrier status were treated once with methylprednisolone: in the second experiment, five foxes were treated twice, 4 mo after being intravenously CHV infected; and in the third experiment, six foxes were treated five times, 11 mo after peroral CHV infection. Infectious CHV was not isolated after treatment from either naturally or experimentally CHV-infected foxes or from untreated, CHV-seronegative in-contact foxes. Canine herpesvirus DNA was not detectable in mucosal secretions or white blood cells of any of the foxes, whereas all trigeminal ganglia of experimentally CHV-infected foxes were polymerase chain reaction-positive. In CHV-seropositive foxes, anti-CHV antibody titers did not change with time after treatment, and CHV-seronegative in-contact controls did not seroconvert. Hematologic parameters remained mostly unchanged. We conclude that CHV is not as easily reactivated in foxes following corticosteroid treatment as in dogs, although there was no obvious sign of immunosuppression. Canine herpesvirus was not spread from virus carriers to naive in-contact foxes, which may be among possible explanations for the reported low CHV prevalence in wild foxes.

Animals↗