Reinforcement is essential to maintain immunity against covid, says expert | F5 News

In recent weeks, it was possible to observe, in the epidemiological bulletins issued by the State Department of Health (SES), an increase in the number of cases of Covid-19 in Sergipe, in addition to a subtle increase in the number of deaths from the disease.

There is no data regarding the number of deaths that were vaccinated or not, according to the SES. However, it was observed by the folder that most deaths from Covid-19 registered in the state were elderly people, with multiple comorbidities and who did not have any of the booster doses of the vaccine.

This demonstrates the need to seek the complete vaccination schedule, especially in the most vulnerable groups, points out the SES.

“Only with the four doses applied, the individual obtains greater immunity against the new coronavirus, being able to get sick, but with a lower risk of evolving into a worsening or complications”, says Marco Aurélio, director of Health Surveillance of the folder.

In an interview with F5 NewsDiego Moura Tanajura, professor at the Federal University of Sergipe (UFS) and specialist in Immunization, explained better how the vaccine works on the immune system and why booster doses are essential to keep immunity against covid-19 active.

The specialist clarifies that there are two situations in which the body can develop immunity: by direct infection, when the person is exposed to the virus, and by vaccination. However, he explains that only vaccination is safe, since the infection is linked to a series of risks.

“The person can get sick, develop a more serious disease or even sequelae due to this infection. It is much safer for you to develop immunity through vaccination”, considers Diego Tanajura.

In this sense, he explains that vaccination “mimics” an infection to stimulate the body to create immunity against the disease. “Our body thinks it has been infected, and starts producing defense cells, antibodies, and also memory cells. It is these memory cells that are able to remember how to defend themselves from this infection, in case that person encounters the virus in the future,” he clarifies.

However, the expert points out that it was observed that these cells have a short-term memory, from 4 to 6 months, which limits the time of protection against the virus. That’s why booster doses are needed.

“These booster doses are important to update these memory cells, precisely to further extend protection in the vaccinated person”, he explains.

In addition, Diego Tanajura reinforces that vaccination is safe and poses no risk to the individual.

“I see a lot of people who have had the first and second doses and are not going to take the booster. It is important to take the booster dose, because the protection given by the vaccine does not last long. If the person has had this vaccine for more than six months, they need to go back to take these booster doses, otherwise they are at risk of getting complications due to the disease”, he warns.

This impression is confirmed by the data presented by the latest SES epidemiological bulletin. So far, 86.78% of the population has been vaccinated with the 1st dose, and 79.46% with the second. When looking at booster doses, however, these numbers drop a lot – just over half (55.4%) of the population took the 1st booster dose of the vaccine, and only 16.81% had already been vaccinated with the second booster.

Data support vaccine effectiveness
The effectiveness of the vaccine in protecting against complications from covid-19 can be observed if we analyze the history of the pandemic.

Vaccination against covid-19 was started in the country on January 17, 2021. The first doses of the immunizer sent by the Ministry of Health arrived in Sergipe the next day, and on January 19, immunization against the coronavirus was officially started in the country. state.

At the time, nurse Sonia Damásio, who at that time worked in the Intensive Care Unit (ICU) of the Emergency Hospital of Sergipe (Huse), received the first dose of the immunizing agent.

However, due to the limitation in the number of doses, vaccination remained restricted to the most vulnerable groups for a while, being gradually expanded to the rest of the population.

In mid-August 2021, the municipality of Aracaju had already vaccinated with the first dose almost 100% of people aged between 30 and 22 years. On the 19th of the same month, immunization was extended to the entire population over 18 years of age.

Since then, it is possible to observe, in the National Covid-19 Panel of the National Council of Health Secretariats (Conass), a certain stability and constant drops in the number of cases, a situation that changed in periods close to festivities, such as Christmas, New Year’s Eve and the carnival.

The death toll from the disease, on the other hand, remained stable even at these times. On February 4 this year, for example, Sergipe recorded 2,034 cases of covid-19. On the same day, 5 people lost their lives to the disease in the state. On the last day 7, Sergipe accounted for 524 confirmed cases of the disease. On the same day, a death was recorded.

Currently, the moving average of cases in Sergipe is 429. The moving average of deaths is three deaths, according to data updated by Conass on 07/20/22.

The director of Health Surveillance at SES reinforces that, even with vaccination, it is essential that the population maintain safety and personal protection measures, such as the use of masks, hand hygiene and social isolation, when necessary.

Cumulative number of cases and deaths
Since the beginning of the pandemic, 338,392 have tested positive for covid-19 and 6,392 have lost their lives to the disease in the state, according to data updated on 7/20/22 from the National Covid-19 Panel of the National Council of Health Secretariats (Conass). ).

Specialist
Diego Moura Tanajura holds a degree in Biomedicine from the Bahia School of Medicine and Public Health and a master’s and doctorate degree from the Federal University of Bahia (UFBA) and Oswaldo Cruz Foundation (Instituto Gonçalo Moniz/FIOCRUZ-BA).

He has experience in pre-clinical testing of vaccine and drug development, production of nucleic acid (DNA), protein subunit and inactivated microorganism vaccines, and in the use of nanotechnologies for vaccine improvement.

The teacher is also the coordinator of the Instagram profile Immuno News for the dissemination of topics related to immunology.