Negative / Null Result ReportMedicine
Andronache J, Cichna-Markl M, Dobrovolny S et al. · 2026 · NPJ science of food
Food fraud through species substitution has been reported for edible gastropods, particularly in processed products where morphological identification is not feasible. DNA-based methods have been used to identify gastropod species in food…
View details →Failed Experiment ReportMedicine
Loeb SA, Tharp DL, Zawieja SD et al. · 2026 · Journal of cardiovascular pharmacology
Over 30 million individuals globally are afflicted with heart failure with preserved ejection fraction (HFpEF). Despite this substantial figure, treatment options for HFpEF remain limited. This is largely attributed to the variability in…
View details →Negative / Null Result ReportOpen accessMedicine
Otwell T, Knight B, Coryell M et al. · 2025 · Frontiers in cellular and infection microbiology
Molecular diagnostic assays are critical tools to test, diagnose and treat infectious and other diseases. For example, PCR test results have been extremely valuable during the COVID-19 pandemic, not only to provide appropriate health care…
View details →Negative / Null Result ReportMedicine
Gudmundsdottir H, Hernandez-Delima FJ, McDowell BC et al. · 2026 · Surgery
Background Regional lymph node involvement impacts prognosis for patients with pancreatic neuroendocrine tumors and may influence management decisions for small tumors. Conventional cross-sectional imaging modalities have low sensitivity…
View details →Negative / Null Result ReportOpen accessMedicine
Khoshakhlagh M, Dehghani T, Alizadeh A et al. · 2026 · Iranian journal of pathology
Background & objective Real-time PCR is widely used to detect SARS-CoV-2, the virus responsible for COVID-19, but false-negative results can occur even with internal controls. This study aimed to investigate the impact of using alternative…
View details →Negative / Null Result ReportOpen accessMedicine
Cañete FT, Williams L, Parry R et al. · 2026 · Forensic science international. Synergy
The Phadebas® Forensic Press Test (PFPT) is widely employed in forensic laboratories for presumptive saliva screening by observation of α-amylase activity. This enzyme hydrolyses starch embedded in the test paper, resulting in a blue…
View details →Negative / Null Result ReportMedicine
Liu M, Kong L, Sun W et al. · 2026 · Journal of immunotherapy (Hagerstown, Md. : 1997)
To investigate the clinical profile of nivolumab-induced autoimmune hemolytic anemia (AIHA) and to reveal the diagnostic and therapeutic patterns of this disease. Articles on nivolumab-induced AIHA published before October 31, 2025 were…
View details →Negative / Null Result ReportMedicine
Costa M, Rodrigues P, Araújo B et al. · 2026 · Diagnostic microbiology and infectious disease
Cryptococcal meningitis is a life-threatening opportunistic infection in advanced HIV disease. Cryptococcal antigen (CrAg) detection by lateral flow assay (LFA) is the diagnostic cornerstone, offering high sensitivity and specificity.…
View details →Negative / Null Result ReportMedicine
Li QX, Luo LZ · 2026 · BMC infectious diseases
Background Cutaneous infections caused by non-tuberculous mycobacteria (NTM) are rare. Atypical clinical manifestations and the need for precise microbiological identification often result in misdiagnosis and underdiagnosis. Case…
View details →Negative / Null Result ReportOpen accessMedicine
Gambuś K, Moszczyński K, Popovchenko S et al. · 2026 · Kardiochirurgia i torakochirurgia polska = Polish journal of cardio-thoracic surgery
Introduction Accurate assessment of mediastinal lymph node involvement is crucial for treatment planning in lung cancer. Combined endobronchial and endoscopic ultrasound (CUS) offers high sensitivity and negative predictive value (NPV),…
View details →Negative / Null Result ReportMedicine
Dellbrügge F, Schaumann N, Kruppa M et al. · 2026 · Pneumologie (Stuttgart, Germany)
Abstract We present the case of a 39-year-old Indian female patient diagnosed with tuberculous mastitis and lymph node tuberculosis. The patient had a history of tuberculosis infection treatment as a newborn. She initially presented with…
View details →Negative / Null Result ReportMedicine
Li X, Huang Y, Hao J et al. · 2026 · Current HIV research
Background Married Men who have Sex with Men (MSM) constitute a bridge population for HIV diffusion into low-risk groups, with spousal non-disclosure rates exceeding 60% in China. It will increase the risk of secondary transmission within…
View details →Negative / Null Result ReportMedicine
Tsang SM, Merino Gutierrez V, Yu J et al. · 2026 · Veterinary sciences
Canine babesiosis caused by Babesia gibsoni is prevalent in Hong Kong. While molecular diagnosis via PCR is highly sensitive, it typically requires reference laboratory access, delaying clinical decisions. This study evaluated the…
View details →Negative / Null Result ReportMedicine
Hijaze E, Razi T, Arbel R et al. · 2026 · Journal of clinical rheumatology : practical reports on rheumatic & musculoskeletal diseases
Objective To evaluate the diagnostic performance of BioPlex 2200 multiplex immunoassay (BI) for detecting antinuclear antibodies (ANA), compared with the gold standard, the indirect immunofluorescence assay (IIF), as a screening…
View details →Negative / Null Result ReportMedicine
Tri PM, Hung NT, Liet DH et al. · 2026 · Emergency radiology
Purpose To assess the diagnostic performance of computed tomography (CT) for predicting main pancreatic duct injury in surgically explored patients with distal pancreatic trauma. Methods We conducted a prospective single-center diagnostic…
View details →Negative / Null Result ReportMedicine
Wei XT, Zhu LY, Wu YL et al. · 2026 · Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi
Objective: To evaluate the screening performance and related factors of ultrasound for hepatic steatosis in community-based elderly populations using controlled attenuation parameter (CAP) measured by transient elastography as the…
View details →Negative / Null Result ReportOpen accessMedicine
Zorlutuna Kaymak N, Pekel İ, Demir Tekol S et al. · 2026 · BMC ophthalmology
Purpose To evaluate the diagnostic utility and real-world clinical impact of polymerase chain reaction (PCR) analysis of aqueous humor (AH) and vitreous samples in patients with uveitis including suspected infectious and mixed…
View details →Negative / Null Result ReportMedicine
Genetic And Metabolic Disorders Screening Subgroup Of The Birth Defects Prevention And Control Committee Chinese Preventive Medicine Association, Rare Diseases Branch Of Shandong Medical Association, Genetic Metabolism Branch Of Shandong Provincial Rare Disease Association et al. · 2026 · Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics
High-throughput sequencing technology has recently been used in neonatal disease screening. To address the issues related to the screening process, interpretation of screening results, and recall of positive cases in neonatal genetic…
View details →Negative / Null Result ReportMedicine
Inácio ML, Rusinque L, Nóbrega F et al. · 2026 · Plant disease
Aphelenchoides besseyi , the causal agent of the white-tip disease, is a quarantine nematode known to affect rice ( Oryza sativa ) by colonizing leaf tips and panicles. In January 2021, A. besseyi was detected in Portugal in imported…
View details →Negative / Null Result ReportMedicine
Goren T, Vashdi DR, Beeri I · 2026 · Social science & medicine (1982)
Political trust is considered crucial for enhancing civic compliance with government policies and instructions, particularly during a health crisis. However, evidence from the COVID-19 pandemic, a major global health crisis, suggest a more…
View details →Negative / Null Result ReportMedicine
Mohanta S, Tye KM · 2025 · Neuron
In this issue of Neuron, Biane et al. 1 used cellular-resolution recordings in ventral CA1 (vCA1) to comprehensively establish that it encodes stimulus features and identity, but not a generalized abstraction of valence. This suggests a…
View details →Negative / Null Result ReportMedicine
Zhou G, Dael N, Verweij S et al. · 2026 · Pharmaceuticals (Basel, Switzerland)
Background: The rapid emergence of immune-evasive SARS-CoV-2 variants necessitates the identification of accessible, low-cost prophylactic strategies. While drug repurposing offers a time-efficient alternative to novel drug development,…
View details →Negative / Null Result ReportMedicine
Brent DA · 2026 · Journal of the American Academy of Child and Adolescent Psychiatry
In this issue of JAACAP, Asarnow and colleagues report the results of their innovative, elegantly conducted clinical trial that assessed the added value of stratified, stepped care (SSC) for youth at risk for suicidal behavior in a health…
View details →Negative / Null Result ReportMedicine
Haroon A, Almuhaideb A, Adeleke S et al. · 2026 · Nuclear medicine communications
Objective To assess the accuracy of 18F choline PET/magnetic resonance (MR) when compared with the reference standard MRI-guided template mapping (TPM) biopsies for evaluation of biochemical relapse of prostate cancer in patients with…
View details →Negative / Null Result ReportOpen accessMedicine
Goldstein EL, Marcelo KR, Harjes WR et al. · 2025 · Emergency radiology
Purpose Controversy exists regarding analgesia premedication prior to right upper quadrant ultrasound (RUQUS) in the setting of abdominal pain when evaluating for acute cholecystitis (AC). The purpose of this study was to examine the…
View details →Negative / Null Result ReportMedicine
Bafaraj SM · 2025 · Current problems in diagnostic radiology
The primary aim of this study is to assess how well ultrasonography and 99mTc-sestamibi scintigraphy perform as diagnostic tools for hyperparathyroidism (HPT) when compared to the clinical measurements of parathyroid hormone (PTH) levels.…
View details →Failed Experiment ReportOpen accessMedicine
Puppo I, Vardanyan A, Shahsuvaryan G et al. · 2025 · The American journal of case reports
BACKGROUND Down syndrome, or trisomy 21, is one of the most common chromosomal disorders associated with intellectual disability. Prenatal screening is a proactive approach to identify fetuses with common chromosomal abnormalities.…
View details →Negative / Null Result ReportOpen accessMedicine
Obeidat A, Sabbah BN, Mandourah H et al. · 2025 · Annals of medicine and surgery (2012)
Introduction Testicular sperm extraction (TESE) is a common procedure for retrieving sperm in men with azoospermia. However, the success rates of a second TESE following an initial unsuccessful attempt remain low. This study aims to…
View details →Negative / Null Result ReportMedicine
Olaniyan H, Beckman J, Crosby E et al. · 2026 · Clinica chimica acta; international journal of clinical chemistry
Objectives Timely and locally relevant drug testing is helpful for overdose assessment; however, immunoassay (IA)-based urine drug screens (UDS) often fail to detect emerging substances. This study assesses fentanyl screen utilization and…
View details →Negative / Null Result ReportMedicine
Wang J, Jiang B · 2026 · Journal of infection in developing countries
Introduction Postoperative central nervous system (CNS) infections in craniotomy patients diagnosed through clinical signs and cerebrospinal fluid (CSF) bacterial culture, pose a challenge due to the morbidity and mortality of bacterial…
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