Blood type O least vulnerable to Covid; A, AB at most risk

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COVID-19 increases risks for cancer patients common cold antibodies no help vs coronavirus

A study in June looking at patients in Italy and Spain found that blood type O had a 50 percent reduced risk of severe coronavirus infection (i.e. needing intubation or supplemental oxygen) compared to patients with other blood types. But the impact of SARS-CoV-2 infection on individuals with congenital heart defects, who are generally younger than those with adult-onset heart disease, was unknown.

The second study from Vancouver, Canada on 95 critically ill COVID-19 patients in a hospital found that-after adjusting for sex, age, and comorbidities-patients with blood types A or AB were more likely to require mechanical ventilation than patients with types O or B (84% vs 61%, P = 0.02), indicating higher rates of lung damage. Another study in April (pre-print and awaiting peer-review) found that among 1,559 coronavirus patients in New York City, a lower proportion than would be expected had Type O blood.

There's more evidence that blood type may affect a person's risk for COVID-19 and severe illness from the disease.

Adults and children born with heart defects had a lower-than-expected possibility of developing moderate or severe COVID-19 symptoms, according to a new study which cautioned that elderly patients with similar congenital conditions might have a different risk profile.

More than 80% (43) of these patients had mild symptoms.

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Though the study sample was small, the researchers conclude that congenital heart disease alone may not be enough to increase the risk of severe COVID-19 symptoms.

The two significant takeaways here are that there is as yet unquestionably more information needed before any definitive conclusions can be drawn from this research, and that regardless of whether ABO blood type assumes a function in the virus's ability to contaminate somebody or cause them serious harm, it's as yet not a sufficient distinction to influence pandemic best practices for anyone.

As COVID-19 cases continue to rise in the United Kingdom, more people will suffer "debilitating" long-term after-effects of a related infection, academics have warned.

The scientists, including those from the Columbia University Irving Medical Center performed a retrospective analysis of more than 7,000 patients from the congenital heart disease center at the Vagelos College of Physicians and Surgeons in the US. "We have yet to define what those risk factors are", Anderson added.

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