A study of more than 3,000 young U.S. Marines found that those without a history of COVID-19 had a five-fold higher risk of infection than those previously infected, according to results published in the journal Lancet Respiratory Medicine.
The study also found that about 10% of young marine survivors of COVID-19 had 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.
“Among 189 HIV-positive participants, 19 (10%) had at least one positive PCR test for SARS-CoV-2 during the 6-week follow-up (1 · 1 case per person-year),” the study found.
The study found that previously infected sailors who were reinfected had lower antibody levels and fewer neutralizing antibodies, compared to previously infected sailors who were not reinfected.
“Although antibodies induced by the initial infection are largely protective, they do not guarantee effective SARS-CoV-2 neutralizing activity or immunity to subsequent infection,” the study mentioned.
“This analysis was conducted as part of the COVID-19 Potential Marine Response to Health (CHARM) study. CHARM included predominantly male U.S. Marine recruits, aged 18 to 20. years, after an unsupervised quarantine of two weeks at home, ”he said. .
A separate study published in the journal Lancet in March found that most people who have had COVID-19 are protected from re-inducing it for at least six months, but older people are more prone to reinfection than people teens. Read more
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