Is It Safe to Get 1 COVID-19 Vaccine Now and Another Later?

Is It Safe to Get 1 COVID-19 Vaccine Now and Another Later?

  • Johnson & Johnson has announced its application with the FDA to obtain an EUA for its COVID-19 vaccine.
  • While this would help get the population vaccinated more quickly, there’s concern the company’s vaccine is not as effective as the Pfizer and Moderna vaccines.
  • Experts say there may not be a choice over which vaccine to choose until vaccine production can match population needs.
  • However, more effective vaccines will become available at a later time.
  • Experts emphasize that all three vaccines are safe and will help control the pandemic.

Johnson & Johnson announced on Feb. 4 that it had applied with the Food and Drug Administration (FDA) for an emergency use authorization (EUA) for its single-dose COVID-19 vaccine.

The company said it would be able to give the vaccine to the U.S. government immediately upon FDA approval.

Also, it expects to be able to supply 100 million doses in the first half of 2021.

However, one potential drawback to the new vaccine is that it may be less effective than the other two vaccines, Moderna and Pfizer, which have an EUA.

Though more vaccines would make it easier to vaccinate more people quickly, questions center on whether recipients of the Johnson & Johnson vaccine would be able to get a more effective vaccine later.

How Johnson & Johnson’s vaccine differs from Moderna and Pfizer

The Johnson & Johnson vaccine works similarly to the Moderna and Pfizer vaccines — it causes cells to produce the coronavirus’ “spike” protein, said Dr. H. Dirk Sostman, president of the Academic Institute at Houston Methodist,

However, it does this in a slightly different way.

Instead of using messenger ribonucleic acid (RNA) to deliver the instructions, it uses a DNA construct that produces the RNA in people’s cells, Sostman explained.

Also, rather than using an artificial lipid nanoparticle as a carrier like the Moderna and Pfizer vaccines, it uses an adenovirus as a carrier.

Though adenoviruses are common causes of diseases — such as the common cold — they are inactivated in the vaccine and cannot cause illness, explained Dr. Niraj Patel, who chairs the American College of Allergy, Asthma and Immunology COVID-19 Vaccine Task Force.

So, while Johnson & Johnson’s is a bit more complicated in how it delivers its payload, it accomplishes the same goal: safely triggering an immune response to the SARS-CoV-2’s spike protein.

How does it compare in its effectiveness?

Patel noted that in the phase 3 trial of the Johnson and Johnson vaccine, which included 40,000 participants, the vaccine was 66 percent effective in preventing moderate to severe COVID-19 disease.

Further, it was 85 percent effective in preventing severe disease.

“While this may seem disappointing compared to the Pfizer and Moderna, which reported about 95 percent effectiveness in preventing moderate to severe disease, the efficacy of the annual influenza vaccine averages about 60 percent,” said Patel, “and does prevent a significant amount of illnesses and hospitalizations annually.”

He added, “Any vaccine that reduces the burden of severe disease due to COVID-19, like the Johnson & Johnson vaccine, is going to help fight the pandemic.”

Also, the Johnson & Johnson vaccine has the advantage that it is a single-dose vaccination, he said.

Will we have a choice which vaccine to take?

Patel said that while it’s possible people may begin to request a particular vaccine based upon efficacy data, it is unlikely there will be a real choice in which to receive.

“At this time, it is expected that there will continue to be a limited supply of vaccine available until production can meet the overall demand,” he said.

Because of this, people will probably receive whatever vaccine is available at that time.

In the future, variables such as whether it’s difficult for an individual to get a second dose or temperature requirements for vaccine storage may factor into which vaccine a person might get.

Will we be able to get a more effective vaccine later if we do get the Johnson & Johnson vaccine?

Sostman said yes, it will be possible to take a different type of vaccine later.

“Getting one kind of COVID-19 vaccine does not make it unsafe or ineffective to get a different kind later,” he explained.

However, if receiving the Pfizer or Moderna vaccine for the first two shots, people should stay with the same vaccine. It is unknown if the effectiveness is the same with a mixed series.

“As far as future boosters, since the vaccine updates will be based on the current vaccines, it may make sense to stay with the same one you started with, but likely this will be less critical,” he said.

Sostman said that what boosters will look like in the future is unknown, but they may need to be updated each year, similar to flu vaccines.

A final word from our experts

Both experts emphasized that the vaccines are safe, and despite what is often shown in the media, severe allergic reactions are rare.

Maybe 5 per million will have a severe allergic reaction, Sostman said.

People with histories of severe allergies should tell their vaccination provider and speak with an allergist before obtaining a vaccination.

No other serious problems have been shown to be related to the vaccines, he said. The most common side effects include local reactions, such as a sore arm, swelling, fatigue, and headaches.

The side effects usually last one to two days and can be controlled with over-the-counter medications like acetaminophen (Tylenol) or ibuprofen (Motrin).

When compared with the genuine risks associated with COVID-19, these risks are small.

There is a 10 percent risk of being hospitalized with COVID-19, Sostman explained.

Also, if you are hospitalized, there is a 10 percent risk of dying.

Also, there are high risks of having long-term complications such as chronic fatigue, “brain fog,” or heart problems.

“Keep in mind that more than 440,000 people have died from COVID-19 in the U.S.,” Sostman said. “Don’t add to this grim total. Get vaccinated as soon as you can.”


First, here’s a quick review on how to properly wear a mask. Make sure it:

  • Covers your full nose.
  • Covers your entire chin.
  • Fits snug with no gaps.
  • Is made of thick material. (Hold it up to the light. If you can see between the fibers, it’s not a good filter.)

To help prevent the spread of COVID-19, a mask should be worn in all public places and when social distancing isn’t possible. Routine and frequent washing of your masks is recommended. While most of us are trying to stay home more and avoiding public places, sometimes that isn’t possible. If you find yourself wearing your mask more than a few hours total each day, it should be washed before reuse.

How to wash your cloth mask

If your mask is machine-washable, you can include it with your laundry using regular detergent and the warmest appropriate water temperature for the load. In the dryer, use the highest heat setting possible and don’t take it out until it’s completely dry.

If your mask can’t go in the washer or a machine washer isn’t available, you can sanitize it by hand with a bleach solution. First though, make sure the bleach you have is intended for disinfection. Some bleaches are made for colored clothing and might not disinfect properly. After confirming you have the correct bleach, follow these steps:

  • Mix ¼ cup of bleach and one quart of room temperature water.
  • Soak your mask in the solution for five minutes.
  • Rinse thoroughly with cool water.
  • Lay flat and allow to dry completely.

Other reminders to keep you and your mask hygienic:

  • Don’t touch the front of your mask. Use the ear or head fasteners to remove it.
  • Wash your hands immediately after removal.
  • Don’t store masks in pockets or purses. Instead, carefully fold the mask so the outside is folded inward against itself and place it in a clean paper bag.

Remember to do your part by wearing a mask to help reduce the spread of COVID-19 and continue to practice social distancing and frequent handwashing. These three simple steps are still the best defense we have to reduce transmission. And that’s always in fashion!

CINTAA Elder care shares useful information regarding healthcare on weekly basis. The post is only for information purpose only. Please check with your health care professional before using this information. To keep yourself updated with many other health tips, stay with us. We provide certified caregivers for seniors at home. If you need any help regarding eldercare, please feel free to call us today at 561-963-1915.





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