So how exactly does influenza vaccine affect the chance of contracting COVID-19? – News-Medical.Internet

The coronavirus disease 2019 (COVID-19) is definitely an acute respiratory system ailment that is because infection using the severe acute respiratory system syndrome coronavirus 2 (SARS-CoV-2). Because of the rapid transmission of SARS-CoV-2 and it is high morbidity and mortality rates, COVID-19 remains a substantial threat.

Study:&nbspDoes Influenza vaccination reduce the risk of contracting COVID-19? Image Credit: alessandro guerriero /

Study:&nbspDoes Influenza vaccination prevent contracting COVID-19? Image Credit: alessandro guerriero /


Initially, the introduction of herd immunity when the vaccinated population arrived at 70% was thought to lessen the transmission of SARS-CoV-2.

However, the speed of vaccination in various nations varies based on their specific economy. Consequently, civilized world frequently possess a greater vaccination rate when compared with underdeveloped countries. This increases the chance of prolonging the pandemic because of the emergence of mutated strains of SARS-CoV-2.

Several research has observed that the chance of infection and disease transmission are separate from finishing a COVID-19 vaccination regimen. Although the chance of creating a severe infection is gloomier in vaccinated people, the transmission of SARS-CoV-2 variants between vaccinated and unvaccinated individuals still occurs and may subsequently result in the emergence of recent variants.

Presently, ten SARS-CoV-2 variants are now being monitored, a couple of that are considered variants of interest (VOCs). Thus, there remains a sudden have to better comprehend the evolution of SARS-CoV-2, in addition to develop novel treatments and preventive steps that mitigate its spread and negative effects on human health.

Previous research has assessed whether countermeasures accustomed to safeguard against other kinds of infections could lessen the negative effects of COVID-19. Influenza and COVID-19 are a couple of respiratory system viral illnesses which have similar modes of transmission, clinical outcomes, hospitalizations, complications, and dying rates. Furthermore, the transmission of those infections frequently peaks throughout the winter several weeks.

The very best technique to prevent and control influenza epidemics is annual influenza vaccination. Similar vaccination campaigns are also essential in manipulating the COVID-19 pandemic.

The SARS-CoV-2 Omicron variant, that was first detected in Nigeria on November 24, 2021, acquired a minumum of one of their mutations in the common cold virus which was also contained in exactly the same infected cell. The signs and symptoms of Omicron infection will also be much like those of the most popular cold.

Particularly, flu vaccination has formerly been found to lessen intensive care unit (ICU) admissions, hospitalizations, and mortality from SARS-CoV-2 infections. However, such findings are contradictory and inadequate. Further research is required to better comprehend the protective role from the flu vaccine on COVID-19 infections.

A brand new Spanish study printed around the preprint server medRxiv* describes the association between the chance of contracting COVID-19 and also the periodic flu vaccine in patients to whom influenza vaccine is suggested.

Concerning the study

The present study involved patients who have been considered high-risk for flu complications and were, consequently, suggested for vaccination. The clinical history of the sufferers was collected to acquire info on COVID-19 diagnosis and flu vaccination.

Study participants residing in nursing facilities were studied individually because of different living conditions. Both trivalent and quadrivalent flu vaccines were administered towards the study participants.

The Mortality in small Spanish areas and Socioeconomic and Ecological Inequalities (MEDEA) deprivation index was utilized for that analysis of health inequalities and identification of regions with socioeconomic vulnerability. Info on the gender, age, risks for flu vaccination, the incidence of COVID-19, and flu vaccine receipt were also collected.

Study findings

From the 429,537 study participants, about 45% were vaccinated from the flu, while 56.8% were women. Participants older than 80 were that appears to be vaccinated. Furthermore, about 4% of vaccinated people and 4.44% of unvaccinated people contracted COVID-19.

Patients with risks for flu complications, for example individuals with cardiovascular illnesses, lung problems, diabetes, and kidney problems, who also received influenza vaccine were in a lower chance of contracting COVID-19.

Probability of contracting COVID-19 depending on whether or not the patient had received the flu vaccine. Possibility of contracting COVID-19 based on set up patient had received influenza vaccine.

High MEDEA values were connected with lower vaccination rates along with a greater chance of COVID-19. Furthermore, at high MEDEA index values, people under 60 years old were connected with greater COVID-19 incidence rates when compared with individuals older than 60.


The present study shows that influenza vaccine could prevent COVID-19 among people who are at high-risk for flu complications. However, continuous and efficient immunizations are needed to lessen the responsibility of respiratory system illnesses, especially throughout a period by which influenza and COVID-19 overlap.

Further research is required to develop preventive strategies against both illnesses concurrently, as there’s a good venture of just living with infections for any lengthy time.

*Important notice

medRxiv publishes preliminary scientific reports that aren’t peer-reviewed and, therefore, shouldn’t be considered as conclusive, guide clinical practice/health-related behavior, or treated as established information.

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