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An early symptom indicating the onset of an attack or a disease.

[French, from Latin prodromus, precursor, from Greek prodromos, precursor : pro-, forward; see pro-2 + dromos, running.]

pro·dro′mal (-drō′məl), pro·drom′ic (-drŏm′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adj.1.prodromal - symptomatic of the onset of an attack or a disease
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a. prodrómico-a, rel. a la fase inicial de una enfermedad.
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Among older adults, adherence to a Mediterranean diet is associated with lower probability of prodromal Parkinson's disease, according to research published in Movement Disorders.
United States-based Vaccinex has completed patient recruitment for the SIGNAL trial, a phase two multi-centre, randomised, double-blind, placebo controlled study in subjects with early manifest and late prodromal Huntington's disease to evaluate the safety, tolerability, pharmacokinetics, and efficacy of VX15/2503 (pepinemab), it was reported on Friday.
After a prodromal period of 7-10 days, unilateral or bilateral follicular conjunctivitis develops; within 2-4 days after onset of conjunctivitis, diffuse epithelial keratitis appears, followed by focal epithelial keratitis.
The disease can be broadly classified into three prominent categories: prodromal febrile stage followed by acute encephalitic stage marked by CNS involvement.
The prodromal symptoms of complications include myocarditis, hepatitis, encephalitis, low platelet count, and multiple organ failure, the agency added.
But late-life depression may be prodromal symptom of dementia and biologically linked to increased stress hormones, decreased hippocampal volume.
"Various clinical disturbances precede MS diagnosis by several years, supporting a prodromal phase to the disease and improving our clinical knowledge of early MS," the authors write.
Patients typically present with mild encephalopathy following prodromal symptoms such as fever, cough, vomiting and/or diarrhea.
The team analysed data from 39 studies of prodromal symptoms and risk factors for later development of BD.
This is the stage between normal and mutated cells and is called the pre-dormal and prodromal stages."