Study shows that people with
Type A blood have a higher risk of catching coronavirus and of developing
severe symptoms, while people with Type O blood have a lower risk. People with
Type A blood had a 45% higher risk of becoming infected than people with other
blood types, and people with Type O blood were just 65% as likely to become
infected as people with other blood types.
Link to study: https://www.nejm.org/doi/full/10.1056/NEJMoa2020283
The authors are of the opinion that evidence regarding the complete loss of smell, or anosmia and the loss of taste or dysgeusia in people who had no other symptoms but who tested positive for COVID-19 are mostly anecdotal and therefore should be treated as preliminary and with caution.
Link to article: https://www.cebm.net/covid-19/what-is-the-evidence-for-anosmia-loss-of-smell-as-a-clinical-feature-of-covid-19/
A Statement from ENT UK at The Royal College of Surgeons of England, the association of ear, nose and throat physicians in the United Kingdom says a growing body of data from COVID-19 patients in several countries strongly suggests that “significant numbers” of those patients experienced the complete loss of smell known as anosmia as one of the disease’s symptoms.
Link to PDF: Loss of sense of smell as marker of COVID.pdf