Skip to main content

Learn More About the Johnson & Johnson Vaccine From Our Experts

March 3, 2021
2 min read

When you arrive at Lowell General Hospital’s regional vaccination site, only one brand of COVID-19 vaccine will be offered to patients receiving their first dose. Clinical data shows that all three of the vaccines available to our patients are extremely effective at preventing serious illness and decreasing transmission of the virus in the community.

Person receiving needle injection in arm

The most recent vaccine that will be available to our patients is the Johnson & Johnson vaccine. Dr. Adam Weston, a Lowell General infectious disease physician, discusses the effectiveness of this new tool in the fight against the COVID-19 pandemic.

COVID-19 Janssen (Johnson & Johnson) Vaccine FAQ

How is the Johnson & Johnson vaccine different from the Moderna and Pfizer vaccines?

The biggest difference is it is a one-dose vaccine – it does not require a second appointment. According to data from nearly 22,000 patients, the vaccine is 70% effective at providing full immunity from COVID-19, and virtually 100% effective at preventing hospitalization and death. Where it really counts, it’s just as effective as the other vaccines.

If offered, why should I get the Johnson & Johnson vaccine?

The best vaccine for you right now is the one you can get. The Johnson & Johnson vaccine does what really matters – keeping people out of the hospital and from dying while decreasing transmission in the community. The faster we vaccinate our community, the faster we can get all of our lives back to normal.

If I take the Johnson & Johnson vaccine and get exposed to COVID-19, what will happen?

According to the data, about 7 in 10 people will be fully protected. For those who don’t achieve full immunity, cases may be very mild and the worst cases will have only moderate symptoms. Everyone is protected from severe illness, and that will significantly limit the ability of the virus to spread.

A man and a child planting a garden
Articles
Lyme Disease this Season: Symptoms, Prevention + What’s New in Treatment
April 3, 2026
Learn how to prevent Lyme disease, recognize early symptoms and explore new treatment advances, plus how Tufts Medicine is leading Lyme disease research.
Woman breathing
Articles
Ask the Experts: At-Home Tests for Respiratory Illnesses
February 4, 2026
Tufts Medicine experts explain how to effectively use at-home tests to detect respiratory viruses like COVID-19 and flu, helping patients make informed decisions about isolation, treatment, and seeking emergency care.
Man who is sick with the flu in bed with tea
Articles
Is It Too Late to Get a Flu Shot This Season? What to Know During the Flu Surge
January 12, 2026
Tufts Medicine’s Shira Doron, MD, Chief Infection Control Officer, and Professor, Tufts University School of Medicine, on what to know about the flu surge.

Be among the first to know

Enjoy the latest health updates from Tufts Medicine by signing up for our e-newsletter today.

Jump back to top