Blood type could be linked to Covid-19 risk and severity

Blood type could be linked to Covid-19 risk and severity

While it's still not clear whether this link is a direct cause-and-effect relationship or simply a coincidental correlation, the two new bits of research further builds on the idea that blood type might have some role in how Covid-19 affects people. Experts say more research is needed.

As the number of coronavirus cases in the United States approaches 8 million and deaths near 218,000, an influential model foresees 171,000 more Covid-19 deaths by February. "Such patients stayed in the intensive care unit longer than those with the first and third blood groups". "When you vaccinate enough people, the disease stops spreading, and that might be 60%, 80%, 90% for different diseases". Nor should people worry unduly about the link between blood type and Covid-19, said Dr. Torben Barington, the senior author of the Danish paper and a clinical professor at Odense University Hospital and the University of Southern Denmark.

It is impossible to keep only the vulnerable protected from the spread, Frieden said.

"I think this has scientific interest, and when we find out what the mechanism is, perhaps we're able to use that proactively in some way in regard to treatment".

The researchers examined data from 95 critically ill COVID-19 patients hospitalised in Vancouver. They found that patients with blood groups A or AB were more likely to need mechanical ventilation, with 84 percent of A or AB patients requiring mechanical ventilation compared to 61 percent of O or B patients. Around 42 percent of the Danish population has blood type O and another 42 percent have blood type A. Despite equal representation, fewer people with blood type O caught Covid-19; just 38 percent of the people who tested positive were blood type O, while 44 percent were blood type A. Similarly, people with blood type B and AB also received more positive Covid-19 results than expected.

Previous findings inferred the production of antibodies from initial infections and suggested that levels of antibodies drop rapidly after infection, providing short-term immunity only.

"While we're not quite to the point where this is ironclad, it's clearly suggestive, and we have not seen anything inconsistent with this".

Adalja said that blood types and their susceptibility to various infections have been studied in the medical literature before. The Danish study analyzed data from nearly half a million people tested for the virus and found that people with blood type "O" had significantly reduced susceptibility to coronavirus infection. "I think we're in for a pretty bad fall and winter", said Dr. Peter Hotez, professor and dean of tropical medicine at the Baylor College of Medicine.

Correction: A previous version of this story inaccurately reported how numerous people who tested positive in the Danish study were blood type O.

Indiana State Health Commissioner Dr. Kristina Box on Wednesday said that she, an adult daughter and 23-month-old grandson have tested positive for COVID-19.

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