Science, Safety and Efficacy
Why get the COVID-19 VaccineThe authorized COVID-19 vaccines are important tools in our fight against COVID-19 and will help to protect you and end the pandemic.
Based on both clinical trial and real-world data, the COVID-19 vaccines are:
- Safe with limited short-term side effects. Millions of Americans have now safely received a COVID-19 vaccine.
- Highly effective in prevention of: COVID-19 infections, hospitalizations related to COVID-19 and deaths related to COVID-19.
- Effective in reducing the severity of infection for those rare, vaccinated individuals who may still get COVID-19.
Get to Know the Vaccines
Additional Information for Johnson & Johnson (Janssen)
Keeping you informed is important to us. Here are a few things to know about the Johnson & Johnson (Janssen) COVID-19 vaccine and additional resources:
- The Johnson & Johnson (Janssen) COVID-19 vaccine is administered in a single dose.
- The FDA and CDC have recommended that the use of the Johnson & Johnson (Janssen) COVID-19 vaccine resume in the United States, effective April 23, 2021. Here is the CDC/FDAstatement.
- A review of all available data currently shows that the Johnson & Johnson (Janssen) COVID-19 Vaccine’s known and potential benefits outweigh its known and potential risks. The FDA released this Emergency Use Authorization fact sheet with more information about the vaccine and its allowed use.
- Women younger than 50 years old should be aware of the rare but increased risk of blood clots with low platelets after vaccination. Here are additional questions and answers provided by the CDC.
How Vaccines Work
Messenger RNA (mRNA) is a genetic coding material that is translated by cells into a protein. mRNA historically has been very unstable and easily broken down by the human body, which makes it challenging to study. Recent technological advancements have reduced these challenges and improved the stability, safety and effectiveness of mRNA vaccines. Both the Pfizer and Moderna vaccines use mRNA that encodes the spike protein from SARS CoV-2, which is the main protein the immune system uses to respond to the virus.
Unlike an mRNA vaccine, the Johnson and Johnson vaccine is an Adenovirus vector vaccine, which has been extensively studied and used safely in clinical studies involving vaccines for Ebola virus, RSV, HIV, Malaria, HPV and Zika virus.
Watch and listen as Spectrum Health experts briefly answer these commonly asked questions about how vaccines work:
- Pfizer and Moderna COVID-19 vaccine FAQs
- Johnson & Johnson COVID-19 vaccine FAQs
- Video: Darryl Elmouchi, MD, President, Spectrum Health West Michigan, answers questions about the Johnson & Johnson vaccine
Pregnant and lactating individuals
The American College of Obstetricians and Gynecologists (ACOG) recommends that COVID-19 vaccines should not be withheld from pregnant individuals who meet criteria for vaccination. Learn more about their recommendations for pregnant and lactating patients, and have a discussion with your health care provider about your specific situation.
At this time, the Pfizer vaccine has received emergency use authorization for individuals 12 and older. The Moderna and Johnson and Johnson vaccines are not authorized for anyone younger than 18.
The Advisory Committee on Immunization Practices (ACIP) recommends persons with immunocompromising conditions or on immunosuppressive medications receive COVID-19 vaccination unless otherwise contraindicated.
There are usually mild to moderate side effects from the COVID-19 vaccine. The most common side effect caused by the vaccine includes pain at the site where the vaccine was given, which is in the arm. Other side effects may include a headache, fever, chills or muscle aches. The symptoms below are commonly experienced after a vaccine:
- Injection site pain, swelling or redness
- Excessive tiredness or feeling weak
- Muscle pain, joint pain
- Nausea or upset stomach or diarrhea
- Swollen lymph nodes
If side effects are worrisome or do not seem to be going away after a few days, a person should contact their primary care provider to further discuss. If the person does not have a primary care provider, we suggest scheduling a virtual visit through the preferred health system’s electronic resources.
If your symptoms are life threatening, call 911 or go to the nearest emergency department.
Allergic or severe COVID-19 vaccine reactions
The Centers for Disease Control and Prevention has a helpful resource here about COVID-19 vaccines for people with allergies or who are concerned about allergic reactions.
Safety precautions after the COVID-19 vaccine
At this time, we do not know the impact vaccination will have on transmission of the virus. This will only be answered with studies after widespread vaccine rollout. Safety measures, including mandatory masking, social distancing and pre-procedure COVID-19 testing will still be required until more information is available.