Instruct: Identify the main category of the given Medrxiv paper based on the title.
Query: Safety and immunogenicity of heterologous boost immunization with an adenovirus type-5-vectored and protein-subunit-based COVID-19 vaccine (Convidecia/ZF2001): a randomized, observer-blinded, placebo-controlled trial
Egg-derived anti-SARS-CoV-2 immunoglobulin Y (IgY) with broad variant activity as intranasal prophylaxis against COVID-19: preclinical studies and randomized controlled phase 1 clinical trial
Sex disparities and neutralizing antibody durability to SARS-CoV-2 infection in convalescent individuals
Adjustment for Unmeasured Spatial Confounding in Settings of Continuous Exposure Conditional on the Binary Exposure Status: Conditional Generalized Propensity Score-Based Spatial Matching
COVID-19 Test Positivity Rate as a marker for hospital overload
Effectiveness of BNT162b2 and mRNA-1273 COVID-19 boosters against SARS-CoV-2 Omicron (B.1.1.529) infection in Qatar
A Framework for Assessing the Impact of Accelerated Approval
Dexamethasone 12 mg versus 6 mg for patients with COVID-19 and severe hypoxia: an international, randomized, blinded trial
CNVxplorer: a web tool to assist clinical interpretation of CNVs in rare disease patients
Changes in symptomatology, re-infection and transmissibility associated with SARS-CoV-2 variant B.1.1.7: an ecological study
Monocyte, Neutrophil and Whole Blood Transcriptome Dynamics Following Ischemic Stroke
The impact of gastric acid suppression on the developing intestinal microbiome of a child
Support needs and barriers to accessing support: Baseline results of a mixed-methods national survey of people bereaved during the COVID-19 pandemic
A Qualitative Study Regarding Messages of the COVID-19 Vaccine from Vaccinated Healthcare Providers and Healthy Adults
Weighting of risk factors for low birth weight: A linked routine data cohort study in Wales, UK.
Chronic lithium therapy and urine concentrating ability in individuals with bipolar disorder: association between daily dose and resistance to vasopressin and polyuria
Nasogastric tube in critical care setting: combining ETCO2 and pH measuring to confirm correct placement
Decline in COPD Admissions During the COVID-19 Pandemic Associated with Lower Burden of Community Respiratory Viral Infections
CD14 Positive Extracellular Vesicles in Broncho-Alveolar Lavage Fluid as a New Biomarker of Acute Respiratory Distress Syndrome
Using next generation matrices to estimate the proportion of cases that are not detected in an outbreak
The Middle-Out Perspective -- an approach to formalise 'normal practice' in public health advocacy
The National COVID Cohort Collaborative: Clinical Characterization and Early Severity Prediction
SEED: Symptom Extraction from English Social Media Posts using Deep Learning and Transfer Learning
Exon variants associated with asthma and allergy
Modelling COVID-19 evolution in Italy with an augmented SIRD model using open data
Long-term Services and Supports, Cognitive Impairment, and Disease Management among Older Chinese Adults