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Interestingly, at least 20 cases show that COVID-19 patients experienced clinical parkinsonism following SARS-CoV-2 infection [17], pointing to a potential link between COVID-19 infection and newly formed parkinsonism

It has been suggested that a healthy, breast-fed infant with unconjugated hyperbilirubinemia, normal hemoglobin concentration, normal reticulocyte count, normal blood smear, no blood group incompatibility, and no other abnormality on physical examination may be presumed to have early breast-feeding jaundice

What the evidence does support is this: B12 deficiency causes fatigue and neurological symptoms, and correcting deficiency in people who are deficient improves those symptoms

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