That's the suggestion of a pair of new studies on COVID-19 patients, CBS2's Dr. Max Gomez reported Thursday.
On the other hand, those who the research deemed more susceptible to falling ill with Covid-19 include the 31 per cent of the population with blood type A and the 2 per cent of the population with blood type AB.
"This doesn't mean that if you're blood group O you don't have a risk of severe outcomes from covid, nor does it mean that if your blood group A you're doomed", said Dr. Catherine Diefenbach of NYU Langone Health.
Blood donation organisation Australian Red Cross says that 40 per cent of the Australian population has O blood type making it the most common group.
Recall that earlier studies also indicated that those with the second blood group are more likely to contract the coronavirus.
"It is very important to consider the proper control group because blood type prevalence may vary considerably in different ethnic groups and different countries", said study author Torben Barington, from the University of Southern Denmark.
"We do not know whether this is some kind of protection of group O, or whether it's some kind of vulnerability in the other blood groups", he said.
New York, Oct 14 (IANS) New research adds to the growing body of evidence that immunity persists for at least several months after being infected with SARS-CoV-2, the virus that causes Covid-19.
The researchers examined data from 95 critically ill COVID-19 patients hospitalised in Vancouver.
"Patients with blood group "A" or "AB" more often required mechanical ventilation and dialysis".
Sekhon said it could be explained by people with blood type O having less of a key clotting factor making them less prone to coagulation problems in the blood.
Thirty-five states are showing increases in new Covid-19 cases greater than 10% over the last week compared to the prior week.
They said that it can not be assumed that people who are at lower risk of severe illness and death from COVID-19 are also at low risk of ongoing COVID.
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.
Adalja said that blood types and their susceptibility to various infections have been studied in the medical literature before.
Researchers also found the blood type A or AB group had longer stays in the intensive care unit, a median of 13.5 days, compared to the other group with blood type O or B who had a median of 9 days.
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. "There's more science to be done here, but it seems to me that there's more evidence accumulating for this hypothesis".