During the mission, the crew was contained on board and the members were, therefore, exposed at the same time and in the same place to SARS-CoV-2. The first confirmed case occurred on February 28, 2020. A SARS-CoV-2 epidemic broke out on-ship, requiring its early (2 weeks) return to Toulon (the ship’s main harbor). The aircraft carrier was deployed at sea from January 22 to Apas part of an operational mission. It is also necessary to determine whether different rates of infection reflect the effect of infection prevention strategies or a sharp increase of asymptomatic or mild forms (not seeking medical assistance), which would affect collective immunity.Ī COVID-19 outbreak occurred in April 2020 on the French Navy nuclear aircraft carrier “Charles de Gaulle”, which had 1,769 crewmembers. On this background, it is important to further explore the relationships between ABO blood groups and SARS-CoV-2 infection. 1-4 These studies could be criticized for the lack of data about patients’ exposure to the virus before developing COVID-19 and for probably not including all forms of the disease. Numerous studies indicated that people with blood group A had a significantly higher risk of SARS-CoV-2 infection, whereas people with blood group O had a significantly lower risk. Our study confirms that in this period of the SARS-CoV-2 epidemic, no young adults can consider themselves more or less at risk in relation to their blood type. Unlike the other studies, we did not compare the distribution of blood groups in hospitalized patients with SARS-CoV-2 infection and in the general population, but rather the distribution of SARS-CoV-2 infection according to blood groups in people exposed at the same time and in the same place to SARS-CoV-2. These data contrast with those of previous studies. Our results show that ABO and Rh(D) blood groups are not associated with increased or decreased risk of infection by SARS-CoV-2. 1–4 This study assessed a large population of 1,769 crewmembers confined to an aircraft carrier who, therefore, constituted an excellent epidemiological model. Four studies have previously implicated ABO blood groups in susceptibility to COVID-19 (symptomatic SARS-CoV-2 infection).
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