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CVS registered pharmacist Ken Ramey prepares to give a Covid-19 vaccine at the island of Vero coast assisted and independent an elderly living neighborhood in Vero Beach, Fla.Wilfredo Lee/AP
This story was last update on Oct. 20.

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Scientific teams around the world have emerged successful Covid-19 vaccines in incredibly brief order. In a feat that also a couple of years earlier would have actually seemed completely out the reach, vaccines come protect against the new an illness were being used before the first anniversary that the disclosure that a brand-new threat existed. This is truly extraordinary.

In the unified States, three vaccines are available. 2 — those from Moderna and Johnson & Johnson — have actually emergency usage authorizations, i beg your pardon are eco-friendly lights from the Food and Drug administration to it is in put into use, also though they have actually not however been totally licensed. In august 2021, the FDA gave complete approval to the vaccine emerged by the partnership of Pfizer and German manufacturer BioNTech for human being 16 and older. This vaccine is offered in younger teenagers under an EUA and is intended to be available for children five and also older through the an initial week of November.

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The Pfizer shot an initial received emergency authorization in mid-December, followed carefully by the one developed by Moderna with assistance from the national Institute of Allergy and also Infectious Diseases.

In so late February came a third. Janssen Pharmaceuticals, the vaccine division of Johnson & Johnson, secured an emergency usage authorization because that its one-dose vaccine. The vaccine was seen as a potential game-changer. The doesn’t require the fussy cold-chain essential to store the Pfizer and also Moderna vaccines from spoiling. The is cheaper, both on a per-dose basis and also because just one dose is needed. Plus that was believed a one-and-done option can entice some human being who couldn’t quickly get two doses to role up their sleeves.

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But since the J&J vaccine’s come on the step there have been a variety of challenges. A manufacturing snafu in the hands of a contract production agency contaminated 15 million doses, which had to it is in destroyed. And also in mid-April, the FDA and also CDC recommended claims pause use of the vaccine as they investigate whether the vaccine cause a rare but serious side effect — the advancement of diffuse blood clots, also though the couple of individuals who emerged the problem had low platelet levels.

What adheres to is a head-to-head comparison of the vaccines developed by Pfizer and also BioNTech, by Moderna, and also by J&J. This write-up will it is in updated as advancements occur.

Vaccine types

The Pfizer and also Moderna vaccines space made making use of messenger RNA, or mRNA, a modern technology that it is provided a little of hereditary code to cell — in effect, a recipe to do the surface protein (known as spike) on the SARS-2 virus. The protein made with the mRNA accuse activate the immune system, teaching it to view the spike protein as foreign and develop antibodies and also other immune weapons through which to fight it.

The J&J vaccine uses a different technique to instruct human being cells to make the SARS-2 spike protein, which climate triggers one immune response. That is what’s recognized as a famous vectored vaccine. A not authorised adenovirus — native a big family the viruses, some the which cause common colds — has been engineered to carry the hereditary code because that the SARS-2 spike protein. As soon as the adenovirus beginning cells, they usage that password to make spike proteins. J&J to work this same approach to make an Ebola vaccine that has been authorized for usage by the European medicines Agency.


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Target population

The Pfizer vaccine has actually been approved for use for civilization aged 16 and also older, despite its EUA additionally extends to youths ages 12 come 15. Later this month, the FDA is intended to broaden the age group covered by the EUA to include kids aged five to 11. Moderna’s vaccine has been clearing for usage in people 18 and older, though the agency has been trial and error its vaccine in 12- come 17-year-olds. J&J’s vaccine has actually been tested in people 18 and older, and that’s who it was authorized for. Until testing in children and also younger teenagers is conducted, this vaccine won’t be accessible for usage anyone under 18 years old either.

Vaccine efficacy

The Pfizer and Moderna vaccines presented astonishing — and essentially equivalent — degrees of efficacy, at the very least in the at an early stage stages after vaccination.

The Pfizer vaccine confirmed efficacy of 95% at staying clear of symptomatic Covid infection after two doses. The vaccine appeared to be more or much less equally protective across age groups and racial and also ethnic groups.

The Moderna vaccine was 94.1% effective at preventing symptomatic Covid-19 after the second dose. The vaccine’s efficacy appeared to it is in slightly reduced in human being 65 and also older, however during a presentation to the Food and Drug Administration’s advisory committee in December, the company explained the the numbers can have been affected by the fact there were couple of cases in that age group in the trial. The vaccine appeared to be same effective throughout different ethnic and also racial groups.

But compare the efficacy of those vaccines to the efficacy that Johnson & Johnson’s is daunting because of distinctions in the draft of the step 3 clinical tests — basically the trials were experimentation for various outcomes. Pfizer’s and also Moderna’s trials both tested for any kind of symptomatic Covid infection. Pfizer began counting cases from seven days ~ receipt that the second dose that vaccine, while Moderna waited until day 14 to begin counting cases.

J&J, by contrast, seek to recognize whether one dose of the vaccine protected against moderate to major Covid disease — identified as a mix of a positive test and at the very least one symptom such together shortness of breath, start from 14 or 28 work after the single shot. (The company built up data because that both.)

Because that the distinction in the trials, making direct comparisons is a little like to compare apples and oranges. Additionally, Pfizer and Moderna’s vaccines to be tested before the appearance of troubling brand-new variants.

The J&J vaccine to be still being tested when the variants were making the rounds. Lot of the data created in the south African eight of the J&J trial associated people that were infected through the variant an initial seen in south Africa, dubbed Beta.


The J&J one-dose vaccine was displayed to be 66% protective versus moderate to severe Covid infections all at once from 28 job after injection, despite there was variability based on geographic locations. The vaccine to be 72% security in the united States, 66% security in southern America, and 57% safety in south Africa.

But the vaccine was displayed to it is in 85% protective versus severe disease, v no differences throughout the eight countries or three regions in the study, nor across age groups among trial participants. And also there were no hospitalizations or deaths in the vaccine arm of the trial after the 28-day duration in which immune developed.

The vaccines all show up to have lost part efficacy against infection through the Delta variant, which ended up being dominant in the United says in summer 2021 — despite it’s not clear exactly how much the the efficacy decline is due to the mutations that Delta or waning immunity together the months due to the fact that initial vaccination accumulate.

It additionally appears that, when the vaccines are avoiding many infections, vaccinated people who have actually breakthrough infections with the Delta variant deserve to transmit the virus to others (though they are not as transmittable as unvaccinated people). Still, even with Delta, studies show that the vaccines have actually maintained their protectiveness versus severe disease and death.

Number the doses/amounts that vaccine per dose

The primary series of both the Moderna and the Pfizer vaccines is two shots: a priming dose, adhered to by a booster shot. The interval in between Moderna sheep is 28 days; because that the Pfizer vaccine, it’s 21 days.

Each dose of Pfizer’s includes 30 micrograms that vaccine. Moderna went through a much larger dose the vaccine, 100 micrograms. It way the agency is utilizing a little much more than 3 times as much vaccine per human being as Pfizer is. If Moderna’s initial outcomes didn’t it seems ~ to justification the much bigger dose, data suggest the protection the company’s vaccine generates is declining at a slower rate than Pfizer’s is; part experts believe the higher dose may be at least partially responsible.

The J&J vaccine is, as mentioned, a single-dose vaccine. The agency has also tested a two-dose regimen, with the two shots provided 57 job apart. The results from that 30,000-person trial were presented throughout an Oct. 15 meeting of FDA’s Vaccines and also Related organic Products Advisory Committee, as component of its application for one EUA for its booster dose. (More top top this next.)

Durability that protection

Concerns about waning immunity room driving a number of countries to offer their citizens booster shots, regardless of the truth that the director-general that the people Health Organization, Tedros Adhanom Ghebreyesus, referred to as for a moratorium on offering vaccine boosters until 2022 in order to speed up first doses the vaccine to low-income countries.

What shows up to it is in happening is that as much more time passes after vaccination, protection versus all Covid infections starts to decline. Breakthrough situations — i m sorry are mostly mild — have started to increase. The decline has been most pronounced amongst Pfizer recipients. Data indigenous the huge health system Kaiser Permanente of southerly California says the waning is many pronounced versus the Delta different — the main family members of SARS-CoV-2 viruses circulating in the U.S. — but even against other variants protection has actually declined.


All 3 vaccines proceed to offer solid protection against severe illness, though there is worry within the Biden management that this also will undermine if boosters room not given.

A vital question in ~ this allude is even if it is the booster shots will solidify security in a method that is much more sustained, or if these added doses note the start of a continual booster shooting effort.

Booster status

For the objectives of this discussion, there are two kinds of boosters.

The very first is boosters or third shots for human being who room moderately come severely immunocompromised — due to the fact that they room undergoing chemotherapy because that cancer, because they have had actually an body organ transplant and also are ~ above immunosuppressive therapy, or due to the fact that they have progressed or untreated HIV. These were authorized in respectable by the FDA because that the Pfizer-BioNTech and Moderna vaccines, due to the fact that of farming evidence the immunocompromised human being might not be protected by the standard vaccine regimen.

The plan did not use to the one-dose J&J vaccine. It is unlikely numerous immunocompromised world would have actually opted for this vaccine.

The second kind of booster is designed to optimal up protection from the early shot, in the case of J&J, or collection of shots, in the situations of Pfizer and also Moderna. All 3 companies have received authorizations because that booster shots indigenous the FDA.

Pfizer to be the an initial to record with the agency, and its booster was authorized in so late September for civilization 65 and older, human being 18 come 64 with medical conditions that raise their threat of serious Covid, and also people aged 18 come 64 whose work or living arrangements put them at higher risk of serious Covid.

On Oct. 20, the FDA approve EUAs for Moderna and also J&J’s boosters — and also in the process, developed a an extremely interesting situation. (More on this in the following section.)

Unique amongst the companies, Moderna’s third shot contains half as lot antigen together its very first two. (This is no the case for civilization who space immunocompromised. Their third dose that Moderna is a complete dose.) The emergency authorization states — and the Centers for condition Control and Prevention’s vaccine advisory committee is most likely to concur — that the Moderna booster deserve to be offered to the same groups of world as the Pfizer booster.


The FDA’s statement also presages that the boosters will soon be made accessible to more people. Peter Marks, director of FDA’s center for Biologics Evaluation and also Research, has been publicly signalling the agency’s desire to lower the age for booster sheep for all — with no limitations related to medical conditions or employment ar — to 40 from 65.

Both the Pfizer and Moderna boosters room going come be obtainable to human being six month or longer after the 2nd dose in the series.

Not so with the J&J booster. The firm had wanted the booster come be offered six month or more after the early stage shot, except in rare circumstances. However FDA’s vaccine advisers rejected that idea, expressing concern around the level the protection world get from the solitary shot. Lock recommended that everyone who obtained the J&J vaccine need to be vaccinated two months ~ the first dose — v a catchup duration for civilization who are currently further the end from their an initial shot.

Mix and match boosters

It appears getting a booster shot might be a “choose your own adventure” type of experience after the FDA regulation that world eligible for boosters have the right to choose any of the jabs, nevertheless of what brand they originally received.

There is a farming body of evidence that an enhancing with a various vaccine might induce a more comprehensive and longer-lasting immune response — though some combinations might work far better than others.

In announcing the emergency authorizations for the Moderna and J&J boosters, the FDA declared no preference for that gets what, or in what order. Human being who got J&J can obtain a second shot the Moderna (the fifty percent dose) or Pfizer. Civilization who got one that the mRNA vaccines can gain the J&J vaccine as their booster, the agency said.

Not stated in the FDA’s announcement is the reality that tThis brand-new policy will make life much simpler for folks transporting booster shots, especially those do the efforts to an increase people life in irreversible care, homeless house or prisons. Lock will need to carry only one vaccine once they walk to administer booster shots, rather than trying come match civilization to their initial vaccination brand.

Side-effect profile

In the vernacular the vaccinology, shots that trigger a variety of transient side impacts in a the majority of recipients are known as reactogenic.

All of this vaccines — in fact, most if not all the Covid-19 vaccines that have reported data so far — autumn into the reactogenic category. The Advisory Committee ~ above Immunization Practices, the CDC’s expert panel top top vaccines, recommend hospitals beforehand in the rollout that they can want come stagger vaccinations among employees in case some feel too unwell to job-related the job after being vaccinated.

The most typical side results are injection website pain, fatigue, headache, muscle pain, and joint pain. Some people in the clinical trials have reported fever. With the Pfizer and also Moderna vaccines, side results are an ext common ~ the second dose. Younger adults, that have much more robust immune systems, reported much more side impacts than older adults.

To it is in clear: this side results are a sign of an immune system kicking right into gear. They execute not signal the the vaccine is unsafe. To day there space no serious, permanent side effects associated with receipt of this vaccines, which will certainly be carefully monitored together their use expands.


There have actually been reports of severe allergic reactions to the mRNA vaccines. Both the Pfizer and Moderna vaccines appear, on rarely occasions, to trigger anaphylaxis, a severe and potentially life-threatening reaction. Civilization who develop anaphylaxis should be treated through epinephrine — the drug in EpiPens — and may need to be hospitalized to ensure your airways remain open. The CDC says civilization should be monitored because that 15 minute after getting a Covid-19 shot, and 30 minute if they have a background of severe allergies. J&J newly revealed the a solitary case of anaphylaxis has actually been reported in who who received its vaccine.

It will certainly take time come come up with a firm calculation of how frequently this side effect occurs. The most recent data native the CDC suggest that anaphylaxis wake up at a price of about 2.5 situations per one million doses offered of the Moderna vaccine, and also 4.7 instances per million doses of the Pfizer. Many of the human being who have arisen anaphylaxis have a history of serious allergies and also some have had actually previous episodes of anaphylaxis.

The mRNA vaccines carry a small risk the myocarditis and pericarditis, two species of love inflammation that are most generally seen quickly after human being receive their 2nd shots, health and wellness officials have said. Men under 40 it seems ~ to be at highest possible risk, specifically those age 12 come 17. Most situations reported have been mild and resolved.

The J&J additionally appears to have a significant — thought different — problem. A small variety of individuals who obtained the vaccine have actually gone top top to build thrombotic occasions in the mainly or 2 after vaccination; one has actually died. The thrombotic events incorporate diffuse clots and low platelet levels, an unusual mix that deserve to be dangerous if treated improperly. The normal therapy for clots — a blood thinner dubbed heparin — would make the problem worse, the FDA said, warning medical professionals to ask because that a Covid-19 vaccination background if they check out patients v that configuration of symptoms.

Safety because that those who are pregnant, lactating, or planning a pregnancy

Early on in the Covid vaccine rollout, there were no data on which to determine if the vaccines were for sure for human being who room pregnant or lactating. Yet after numerous studies, professionals have break up the vaccines are safe throughout pregnancy and lactationand furthermore, castle are vital for this two groups to receive. This study in the brand-new England journal of Medicine, because that instance, looked in ~ the security of Pfizer and also Moderna vaccines in pregnant and lactating people.

The CDC and the American college of Obstetricians and also Gynecologists recommend that world who space pregnant or lactating should get vaccinated, because of the hazard Covid epidemic poses to them.

There room a lot of rumors making the ring that getting vaccinated against Covid will certainly negatively influence a person’s ability to develop a child. ESPN football reporter Allison Williams freshly announced she to be quitting the network — which has a vaccine mandate — because she desires to have an additional child.

There is no proof that getting vaccinated against Covid intimidates fertility. In fact, a study published last month contrasted pregnancy rates among patients undergoing in vitro fertilization, feather to view if there were differences amongst people who had been vaccinated, who had actually Covid antibodies from infection, or had actually neither. “The current study failed to identify the distinction in the implantation or pregnant rates in between women with recorded seropositivity come the spike protein and women without seropositivity,” the writer reported.

Storage requirements

The mRNA vaccines require an intricate cold chain, the term provided to describe the conditions under which vaccines must be stored during distribution and also when they space in the doctors’ offices, pharmacies, or public health clinics whereby they’ll be administered.

The J&J shot does not, which means this vaccine have the right to be given conveniently anywhere — in doctors’ offices, pharmacies, mass vaccination sites, public health clinics — when supplies space adequate. It can be stored because that at least three month at the temperature that a continuous refrigerator.

Of the mRNA vaccines, Pfizer’s was originally the more complicated to use. It had actually to it is in shipped and stored in ultra-cold freezers — ones that can keep the vials at -94 degrees Fahrenheit. However recently, the FDA announced the the vaccine have the right to be shipped and stored — because that a two-week period only — at temperature of typical pharmacy freezers, between -13 and 5 degrees Fahrenheit. That should make the last stage that the vaccine’s trip from production plant to syringe ready to plunge into an arm rather easier.


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Moderna’s have to be transport at -4 levels Fahrenheit, i beg your pardon is in ~ the temperature that a consistent refrigerator freezer.

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After thawing, a vial of the Pfizer vaccine must be supplied within five days; Moderna’s is stable at refrigerator temperature for 30 days and also at room temperature for 12 hours. J&J’s vaccine can be stored at room temperature — no to exceed 77 degrees Fahrenheit — for 12 hours when the vial hasn’t however been punctured. After ~ the first dose is withdrawn, the vial deserve to be save in a fridge for six hrs or in ~ room temperature for 2 hours.

Andrew Joseph added reporting. 

An previously version that this story mischaracterized the method in which viral vectored vaccines work and incorrectly stated that the solitary dose J&J vaccine contains much more antigen 보다 the sheep in that is two-dose regimen.