although it’s true there are still a lot of things we’re learning about the vaccines — like how effective they are against variants and how long their protection lasts — there are plenty of things we do know that give experts confidence in the long-term safety of the vaccines. the most recent example of this phenomenon is the johnson & johnson covid-19 vaccine. about 7.4 million americans had received the johnson & johnson vaccine when regulators paused its administration to investigate a handful of cases in which people had blood clots. upon reviewing information about the cases, federal health officials determined that the benefits of the vaccine outweighed the risk, and they approved resumed use of the vaccine. when new vaccines are released, the unknown side effects, if any, show up within two months of vaccination. because of this, scientists and public health officials continually monitor vaccine data before, during and after a vaccine becomes available to the public. the vaccines made by moderna and pfizer-biontech use messenger rna, or mrna, to deliver a message to your immune system with instructions on how to fight the coronavirus infection.
mrna vaccines have been studied before for influenza, zika and rabies. learn more about how mrna vaccines work. viral vector vaccines use a modified version of a different virus (the vector) to deliver instructions that teach cells how to fight the coronavirus infection. scientists began creating viral vectors in the 1970s, and they have been studied for gene therapy and cancer treatment. learn more about how the johnson & johnson vaccine works. all of the covid-19 vaccines went through this rigorous process before authorization. after vaccines are authorized and in use by the public, public health officials continue monitoring the data as an additional safety measure. manufacturers must have a plan to report follow-up data, including any events such as hospitalizations and deaths, and they must continue research to generate more data on safety and efficacy.
the pfizer-biontech covid-19 vaccine is 91% effective in preventing the covid-19 virus with symptoms in people age 16 and older. the moderna covid-19 vaccine is 94% effective in preventing the covid-19 virus with symptoms. if you were treated for covid-19 with monoclonal antibodies or convalescent plasma, there is no need to delay getting a covid-19 vaccine. however, fully vaccinated people with a breakthrough infection are less likely to have serious illness with covid-19 than those who are unvaccinated.
fact: you are considered fully vaccinated two weeks after you get a second dose of an mrna covid-19 vaccine or two weeks after you get a single dose of the janssen/johnson & johnson covid-19 vaccine. the technology he was referencing is not a microchip, has not been implemented in any manner and is not tied to the development, testing or distribution of covid-19 vaccines. fact: it’s recommended that you get a covid-19 vaccine if you are pregnant or breastfeeding, trying to get pregnant or might become pregnant in the future. the overall risk of covid-19 to pregnant women is low. due to the fluid nature of the covid-19 pandemic, scientific understanding, along with guidelines and recommendations, may have changed since the original publication date.
the cdc explained that the pfizer and moderna vaccines are preferred due to a greater risk for developing rare but severe blood clots, called thrombosis with suspicions grow that nanoparticles in pfizer’s covid-19 vaccine trigger rare allergic reactions. life-threatening responses seen in at least eight people but now europe’s watchdog is investigating safety concerns with the mrna vaccines produced by pfizer-biontech and moderna. (getty/hector pertuz)., .
covid-19 vaccine technologies have been studied for years and used in other treatments without issue. mrna vaccines. the vaccines made by moderna and pfizer- learn about the pfizer-biontech covid-19 vaccine (comirnaty), including general information, ingredients, possible side effects, and study results. the pfizer-biontech covid-19 vaccine is 91% effective in preventing causes coronavirus disease 2019 (covid-19) as variants of concern:., .
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