A new study conducted among the U.S. Marine Corps military highlights this point: “Subjects with low levels of neutralizing antibodies have been re-infected, indicating that people who were previously infected with the virus will still be infected again in the second moment. Infection”.
Those who have been infected with the Sars-Cov-2 coronavirus can re-infect the virus and spread it to other people. Data from a new observational study of more than 3,000 soldiers in the U.S. Marine Corps from May 2020 to November 2020 shows this. Although most recruits are between 18 and 20 years old, the authors found that the risk of reinfection found in the study may be similar to that of many other young people, although the incidence of cases is not exactly the same. In the military, it is mainly because basic training requires close personal contact, which may lead to a higher overall infection rate than other environments.
For analysis, involving teams from the US Naval Medical Research Center and other civil and military university research centers, the Marines completed a two-week quarantine at home before entering Military quarantine facility Two more weeks. During the first and second weeks of isolation, all had an antibody test to verify seropositivity (previous Sars-Cov-2 infection), and another test to verify positive for Covid-19. Each study participant also filled out a questionnaire containing demographic information, risk factors, medical history and Covid-19 symptoms. Patients who were positive for the coronavirus during the quarantine facility were excluded from the study.There is no evidence that the recruits who are being infected have undergone basic training and been tested For new Sars-Cov-2 infection Once every two weeks. Those who tested positive for the second infection were then isolated, and the research team conducted further tests.
Overall, of the 2,346 Marines who completed the study, there were 189 HIV positive and 2,247 negative at baseline.1,098 new infections occurred in both groups, of which 19 (10%) HIV-positive participants Who is infected with the virus again.
Research results, published in detail in Lancet Respiratory Medicine, Found that among the HIV-positive people, the newly infected recruits Reduce the level of antibodies against Sars-Cov-2 Than those who have not been reinfected. In addition, in the same seropositive group, neutralizing antibodies were detected in 45 out of 54 non-reinfected Marines (83%) and 6 out of 19 reinfected Marines (32%).
The comparison between the two groups of new infections also showed: Viral load The measurable amount of SARS-Cov-2 in reinfected HIV-positive recruits was on average 10 times lower than in infected HIV-negative Marines, indicating that some reinfected participants may have the ability to transmit Infect others. However, approximately 84% of reinfection cases were asymptomatic, compared with 68% of seronegative reinfection cases at baseline, or had mild symptoms and did not require hospitalization.
“Those with low levels of neutralizing antibodies are re-infected, indicating that people who were previously infected with the virus and cured are still susceptible Infect a new virus later -Lieutenant Dawn Wier of the Naval Medical Research Center- As observed in most cases in the study, these reinfections may be asymptomatic. Therefore, the message to all young people, including military service personnel, is clear: There is no guarantee of immunity from natural infections. Even if you have been vaccinated with Covid-19 and cured, you still need to be vaccinated“.