A study of more than 3,000 young American sailors found that those without a history of COVID-19 had a five-fold higher risk of infection than those previously infected, according to findings published in the journal Lancet Respiratory Medicine.
The study also found that about 10% of young marine survivors of COVID-19 received a second infection.
“However, the infection of the past does not guarantee immunity, vaccination remains crucial,” the Lancet said on Twitter, providing the link to the findings.
“Of the 189 HIV-positive participants, 19 (10%) had at least one SARS-CoV-2 positive PCR test during the 6-week follow-up (1 · 1 case per person-year),” the study found.
Pre-infected marines that were re-infected had lower levels of antibodies and fewer neutralizing antibodies, compared to previously infected marines that did not re-infect, the study found.
“Although the antibodies induced by the initial infection are largely protective, they do not guarantee the effective activity of neutralizing SARS-CoV-2 or immunity against subsequent infection,” the study said.
“This analysis was performed as part of the potential COVID-19 Health Action Response for Marines (CHARM) study. at home, “he said. .
A separate study published in the Lancet in March found that most people who had COVID-19 are protected from taking it again for at least six months, but older people are more prone to reinfection than younger people. Read more
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