A tweet says that the vaccines against the coronavirus may lose the 99% of its effectiveness. That is fake; however, there are nasal vaccines under study that can protect the area where the virus enters and thus reduce the risk of infection and transmission of COVID-19.
The post belongs to a Username originally Dominican who has spread disinformation on other occasions. Furthermore, the statement is attributed to Luis Enjuanesa Spanish virologist who appears in the image of a note attached to the tweet.
Enjuanes says that the vaccines have lost efficacy because they have been applied intramuscularly, and suggests that they should be administered by the nasal route: “it is a respiratory virus (the coronavirus) that enters through the nose (…) if it were given by the correct route, we would gain in efficiency”.
The Data Verification and Fact-checking Unit of Cocuyo effect consulted health organizations to verify the effectiveness of the vaccines against COVID-19 and verify the veracity of the information.
Efficacy of intramuscular vaccines
According to the US Centers for Disease Control and Prevention (CDC), effectiveness of the vaccines varies depending on each case. In their estimation, they use as a reference the vaccines based on messenger RNAthat is, those manufactured by Pfizer – BioNTech and Moderna:
- Infection by SARS-CoV-2: 46.9%, for those vaccinated with two doses; 62.8%, for those vaccinated with three doses.
- Hospitalization: 90% after 3 doses of mRNA after 48 to 59 days after the application of the last injection
- Invasive mechanical ventilation (IMV) or death (omicron): 94%, average of 60 days after 3 doses.
CDC’s monitoring of vaccine effectiveness aims to “modify recommendations of the vaccines (as the case may be), guide the policies of vaccination and distribution of vaccines and justify the technology development for vaccine production.
The World Health Organization (WHO) explains that injections against the coronavirus reduce the risk of developing severe symptoms from disease and protects groups at risksuch as the elderly, health personnel and patients with certain diseases.
intranasal vaccines
Manuel Figuera, president of the Venezuelan Society of Infectious Diseases (SVI), explains that there intranasal vaccines against COVID-19 that are under study. There is already a nasal vaccine: the FluMist Quadrivalenta nasal spray flu vaccine.
In accordance with New York Times«mucosal vaccines would coat the mucosal surfaces of the nosethe mouth and the throat with long-lasting antibodies. The outlet quotes Jennifer Gommerman, an immunologist at the University of Toronto, who says that this type of vaccine is “the only way to truly circumvent person-to-person transmission.”
Dr. Figuera explains it as follows:
“The advantage of intranasal vaccines is that they will generate local immunity; vaccines that are injected generate systemic immunity; that is, at the blood level, but they do not do so in the respiratory mucosa, which lines the airways internally from the nose to the deepest part of the lungs ».
The infectologist explains that inhaled vaccines can generate immunity and produce IgA antibodies that, according to New York Timesare the ones present in mucosal surfacessuch as the nose and throat. In addition, Figuera considers that these vaccines can reduce the risk of infection and contagion.
“The vaccines we have today against COVID-19 do not completely prevent infection because, where the virus enters, there is no protection, but they do prevent severe infection and critical because in the end, within the body, we are protecting ourselves well».
In conclusion, it is fake that intramuscular (injected) vaccines against COVID-19 lose 99% effective. However, there nasal vaccinations in study that are intended to be added to immunization schedules as booster shots.
If you receive chains or see suspicious information on social networks, you can forward them to [email protected] or to the number of WhatsApp (0412) 015-0022and thus you will be helping to combat disinformation.
Do vaccines against COVID-19 lose 99% efficacy?
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