So far, more than 2 million people have been fully vaccinated against COVID-19 in Massachusetts.
On April 19, the Massachusetts vaccination plan moved to phase 3 where the general public became eligible.
Many people are wondering: As more of the public gets the COVID-19 vaccine, what will change? Will we still need to take the precautions we take now, like wearing masks and social distancing? And is there an end in sight?
Dr. Armando Paez, chief of Infectious Diseases at Baystate Medical Center, helps clear up some confusion about what getting vaccinated means for our community life.
What is considered fully vaccinated?
According to the Centers for Disease Control, you’re considered fully vaccinated:
- Two weeks after your second dose in a 2-dose series, such as the Pfizer or Moderna vaccines, or
- Two weeks after a single-dose vaccine, such as Johnson & Johnson’s vaccine (currently on hold until further notice)
Can I get COVID-19 after being fully vaccinated?
After you get vaccinated, it takes your body approximately 14 days from the last recommended dose of a series to build up immunity against COVID-19. In the meantime, you could still be infected if you don’t take appropriate precautions. Even after the 14 days, there is a small chance that you could get COVID-19 and pass the infection on to others, although this is less likely.
The vaccines have been shown to protect immunized people from serious illness and death, but that doesn’t mean we’re completely invincible after getting the shot.
How effective are the vaccines?
The CDC studied the effectiveness of the vaccines available, and real world data on vaccine effectiveness have also been reported.
After the second dose of the Pfizer or Moderna vaccines, researchers found them to be at least 90% effective and immunity from vaccination is expected to last for at least six months. A third booster shot is probably needed within a year after the 2-dose series according to the vaccine top executives.
In a Food & Drug Administration (FDA) briefing, the Johnson & Johnson vaccine (currently on hold) was deemed 74% effective against COVID-19 infections that do not show symptoms.
Dr. Paez says that circulating variants can affect vaccine effectiveness. Fortunately, the vaccines are effective so far against the most widespread variant, B.1.1.7 (UK variant). Other variants may not be so.
“What is important is the ‘herd immunity,’ which is the critical level of immune individuals that will end the pandemic by natural infection and vaccination,” Dr. Paez said.
He says that researchers previously estimated 60-70% of the population have to be immune either by natural infection or vaccination to achieve herd immunity. But he says that with the circulating variants a higher threshold will be needed to achieve this.
For perspective, the World Health Organization has herd immunity levels for polio at 80%. It puts herd immunity for measles at 95%.
Possible Need for Booster
We’re still learning about how long vaccines can protect people.
So far, research shows mRNA COVID-19 vaccines (that’s Pfizer and Moderna) can protect you for at least six months. Vaccinated people could have immunity for even longer than that, but it hasn’t been fully studied yet.
Some vaccines are a “one and done” deal. Other vaccines like the tetanus shot require boosters. Scientists still don’t know whether you’ll need regular shots, months or years after your initial ones.
Pfizer and Moderna top executives recently announced that people will probably need a third COVID-19 shot within a year after getting the first two. While it still needs to be investigated, he says people will probably need yearly vaccinations.
The National Institute of Allergy and Infectious Diseases is studying the effectiveness of the Moderna vaccine against a variant originating in South Africa. During the trials, they’ll be testing if a booster specific to that variant will help increase the vaccine’s effectiveness.
The “silent spreader”
Scientists are also still learning what effect vaccines will have on the spread of COVID-19.
Preliminary data from Israel suggest that those who received Pfizer-BioNTech COVID-19 vaccine and later developed COVID-19 have a four-fold lower viral load (key driver of transmissibility) than unvaccinated people. This supports the notion that vaccination can decrease virus transmission.
Some worry that while getting the vaccine may protect you from the virus, it could make you a “silent spreader” – unknowingly giving COVID-19 to unvaccinated family, friends, and strangers.
Dr. Paez explains “silent spreaders” are asymptomatic (don’t have COVID-19 symptoms).
“The virus is present in the nose and respiratory tract, but the person does not get sick – either because of their own immune system or because they’ve been vaccinated,” Dr. Paez says.
However, the virus can still transmit this to someone who doesn’t have those same immune system protections.
So when you get vaccinated, it’s important to know what you can safely do without harming others.
Once I’m fully vaccinated…
Do I have to follow social distancing guidelines?
The CDC now says you don't have to stay six feet apart from people unless it's required by federal, state, or local laws.
Some businesses and workplaces may still require you to social distance.
Do I have to wear a mask?
Fully vaccinated people do not have to wear a mask indoors or outdoors unless:
- It's required by federal, state, or local laws
- It's required by a business, like a grocery store or a bank
- Their workplace requires wearing masks
- They are traveling on planes, buses, trains, and other forms of public transportation
- They are visiting a healthcare location
- They are a patient in a healthcare setting
You can safely invite (or visit) unvaccinated people without wearing a mask. Just make sure no one in the house is especially vulnerable and at risk of severe COVID-19.
Do I need to quarantine if I am exposed to someone with COVID-19?
It depends on your living situation.
You don’t need to quarantine unless you have symptoms.
But the CDC says if you live in a more crowded setting like a group home or a detention center, you should quarantine for 14 days after being exposed to someone with COVID-19. You should get tested even if you don’t have symptoms.
Can I travel again?
The CDC has recently updated its guidance on travel.
The agency says vaccinated people do not have to self-quarantine or get COVID-19 tests in order to travel within the U.S.
If you travel internationally, you do not need a COVID-19 test unless your destination requires it.
If you are coming back to the United States, you need to get a negative COVID-19 test before catching a flight. You’ll also need to get tested again 3-5 days, but you won’t have to self-quarantine.
Make sure to research what rules your destination country may have in place, so you can be in compliance there, too.
Under Phase 4 of Massachusetts reopening plans, fully vaccinated people do not have to restrict their travel. The state encourages people to follow CDC guidelines.
Can I go to large gatherings?
The CDC recommends avoiding large gatherings.
Phase 4 of Massachusetts reopening plan puts some limits on gatherings.
For event venues and public places:
- 100 people indoors
- 150 people outdoors
For private house and backyard gatherings:
- 10 people indoors
- 25 people outdoors
Am I exempt from COVID-19 rules set by my employer?
Follow safety guidelines set by your employer. As Massachusetts businesses reopen, they’ll have to follow new workplace safety guidelines set by the state.
Healthcare workers still need to wear a mask while at work.
Learn more about the COVID-19 vaccine
If you are an eligible Massachusetts resident, schedule a vaccine with Baystate Health or Mass.gov. If you are a Connecticut resident, visit ct.gov.
Find out the differences between the three available vaccines.
Learn what to expect after you get vaccinated.