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pre-existing conditions risk factor

A pre-existing condition refers to an illness (e.g. high blood pressure) or health status (e.g. morbid obesity) that exists prior to some event occurring. 

risk factors
Bell's palsy or an aggressive infiltrating basaloid carcinoma post-mRNA vaccination for COVID-19? A case report and review of the literature
Characteristics and predictors of Long COVID among diagnosed cases of COVID-19
Covid-19-Navigating the Uncharted
Effects of Previous Infection and Vaccination on Symptomatic Omicron Infections
Freedom of Information (FOI) request: COVID-19 deaths and autopsies Feb 2020 to Dec 2021
Letter to the Editor: Severity of SARS-CoV-2 Reinfections as Compared with Primary Infections
Lost microbes of COVID-19: Bifidobacterium, Faecalibacterium depletion and decreased microbiome diversity associated with SARS-CoV-2 infection severity
Nearly 90% of People Hospitalized for COVID-19 Have Underlying Conditions, Says CDC
Risk of severe COVID-19 infection among adults with prior exposure to children
Serious Safety Signals and Prediction Features Following COVID-19 mRNA Vaccines Using the Vaccine Adverse Event Reporting System
Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Naturally Acquired Immunity versus Vaccine-induced Immunity, Reinfections versus Breakthrough Infections: A Retrospective Cohort Study
Sporadic Kaposi Sarcoma Following a COVID-19 Vaccine: Mere Coincidence or Something More?
Studies on Covid-19 Lethality
Underlying Medical Conditions and Severe Illness Among 540,667 Adults Hospitalized With COVID-19, March 2020–March 2021
Weekly Updates by Select Demographic and Geographic Characteristics - Provisional Death Counts for Coronavirus Disease 2019 (COVID-19)
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