COVID-19 (Coronavirus) Update

Based on the facts and science behind the COVID-19 vaccines, the Froedtert & the Medical College of Wisconsin health network believes that getting vaccinated against COVID-19 will be one of the best ways to protect yourself and everyone around you.

Clinical trials found the COVID-19 vaccines to be at least 94% effective in preventing COVID-19 and serious COVID-19 illness across trial participants from multiple backgrounds. For that reason, we are working diligently to offer the vaccine to as many people as possible, as soon as possible.

Understandably, you may have questions and concerns about the COVID-19 vaccines and getting vaccinated. Below you will find helpful facts about the vaccines and the science behind them to help answer your questions and put myths to rest as we work together to curb the COVID-19 pandemic.


V-safe is a new smartphone-based, after-vaccination health checker to track side effects for people who receive COVID-19 vaccines across the country. V-safe uses text messaging and web surveys from the CDC to check in with COVID -19 vaccine recipients. V-safe also provides second vaccine dose reminders if needed, and telephone follow up to anyone who reports medically significant adverse events.

The COVID-19 vaccines are given through two shots in the arm. The second shot is needed in order for the vaccine to work optimally. Depending on which vaccine you receive, the doses are administered approximately 21 days (Pfizer) to 28 days (Moderna) apart.

Mild to moderate side effects like fever, body aches,soreness at the injection site and chills may occur in some people who receive a COVID-19 vaccine–a good sign your immune system is working. Your arm may feel sore at the place where the shot was given for several days afterward.

Those who have received a flu shot can receive the COVID-19 vaccine, and vice versa. The CDC recommends waiting at least 14 days between COVID-19 and other vaccinations to ensure the safety and effectiveness of both.

Even after vaccination, it's important to continue to wear your mask, social distance, wash your hands and stay home if you are feeling ill to prevent future infection.

The COVID-19 mRNA vaccine cannot affect or interact with your DNA. mRNA vaccines teach our cells how to make a protein that triggers an immune response. The vaccine doesn't enter the nucleus of the cell, which is where our DNA is located. This is one of the reasons it is advised that most people get it.

The FDA’s scientific reviewers found the Pfizer vaccine was 95% effective in preventing COVID-19 from seven days after the second dose. Moderna was 94.1% effective in preventing from 14 days after the second dose. The vaccines were shown to be equally effective among all who participated in the trials, including people of Asian, Black, Hispanic/Latinx and Native American descent.

It took less time to develop the COVID-19 vaccine because it is an mRNA vaccine, not a conventional vaccine. Many conventional vaccines require a lot of bacteria or virus, which can take months (or years) to grow. Because the COVID-19 vaccine is synthetic, it can be produced faster in response to large outbreaks.

While it took less than a year to develop the COVID-19 vaccines, the technology used to create them was developed after 30 years of research. As mRNA vaccines, COVID-19 vaccines are produced in a lab and don't contain egg preservatives or latex, which trigger the allergic reactions associated with some conventional vaccines.

If you have tested positive for COVID-19, a vaccination is still recommended for you. Research shows that while contracting COVID-19 gives you some natural immunity for about 90 days, it may not protect you for long and puts you at risk of reinfection. Individuals that have been infected should wait at least 90 days from the time of diagnosis before getting the COVID-19 vaccine.

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