COVID breakthrough infections: What we know about vaccinated people getting coronavirus

What are the probabilities of getting COVID-19 for those who’re absolutely vaccinated? Will you want a booster shot?

Sarah Tew/CNET

For essentially the most up-to-date information and knowledge about the coronavirus pandemic, go to the WHO and CDC web sites.

If you are absolutely vaccinated, must you be apprehensive about getting COVID-19? Not essentially, however don’t throw away your face masks but. Coronavirus infections are rising all through the US once more (nearly 69,000 new cases in someday) as a result of delta variant, and the virus is affecting areas with low vaccination charges. While nonetheless thought of unusual, more cases of absolutely vaccinated people contracting the virus are beginning to seem.

Currently, 162 million people within the US have been absolutely vaccinated — that is almost half of the nation’s whole inhabitants. However, throughout the globe solely 13.3% of people have been absolutely vaccinated — meaning greater than 86% of the overall international inhabitants has the potential to unfold COVID-19, inflicting new variants like delta, lambda and extra to emerge that may probably infect absolutely vaccinated people.

We’ll clarify what a breakthrough coronavirus an infection is, the way it’s doable for absolutely vaccinated people to turn out to be contaminated, and what it means. This data comes from the Centers for Disease Control and Prevention, the World Health Organization and different consultants.

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What is a breakthrough COVID-19 infection?

A breakthrough COVID-19 infection happens when a fully vaccinated person becomes infected with the coronavirus, experiences symptoms, is hospitalized or dies from the infection. While rare, a small percentage of fully vaccinated people can get COVID-19 if exposed to the virus, but they’re much less likely to become sick, according to the CDC

If someone’s fully vaccinated and does test positive for coronavirus, it’s likely they’ll have mild symptoms (see below) or be asymptomatic, Dr. Clare Rock, a Johns Hopkins medical professor, told me on the phone. 

It isn’t yet clear what role vaccinated people with COVID-19 might play in spreading infections. If you do become ill, experts urge you to isolate yourself to prevent others from getting sick — especially people with medical vulnerabilities.

How can a fully vaccinated person still become infected with coronavirus?

Someone can become infected with COVID-19 just before or right after they get the vaccination, as it takes roughly two weeks before the vaccine is most effective. However, even after the immunity builds up, there’s still a chance they can become infected, according to the WHO, since the vaccines aren’t silver bullets against any disease (Moderna and Pfizer are over 90% effective).

While there are still millions of unvaccinated people around the world, new variants will emerge, Rock says. For example, the delta variant currently circulating, can still pose a threat to people who have received full vaccination — especially those who have high risk medical conditions. This can potentially lead to hospitalization or even death (more below). 


It’s rare but possible for a fully vaccinated person to become infected with COVID-19.

Sarah Tew/CNET

How can you protect yourself from breakthrough COVID-19 infections if you’re fully vaccinated?

If you’re fully vaccinated but worried about getting sick, you can take the following precautions. 

  • Wear a mask in public places.
  • Social distance from those who haven’t been vaccinated.
  • Keep your home well-ventilated by opening windows.
  • Wash your hands.
  • Get a COVID-19 test if you’re experiencing symptoms.

Will fully vaccinated people need to get a booster shot?

At this time, there’s not a clear answer. While some say a booster shot may be necessary in the future, the CDC and the Food and Drug Administration don’t agree — at least not yet. Scientists are continuing to study the immunity of fully vaccinated people to get a better idea of how well the vaccines protect them. 

However, Moderna is currently researching if and when a booster shot may be necessary. For instance, vulnerable people who don’t have a robust immune system — such as those with serious medical conditions — may need an additional shot, Rock said.

Pfizer says it’s working on a booster shot for its COVID-19 vaccine (PDF) to enhance immunity for those who have already received both doses. The UK is also prepping for booster shots, with vaccine experts in Britain saying a booster shot may be needed before winter.

Are COVID-19 symptoms still severe if you’re fully vaccinated?

It’s very rare for someone who’s fully vaccinated to experience severe symptoms from COVID-19. People who have received both doses of the vaccine are less likely to be hospitalized or die than those who haven’t been vaccinated, the CDC says. Vaccinated people typically see symptoms like a runny nose, which they mistake as a common cold, Rock said.

But that’s not to say it can’t happen. The CDC says some fully vaccinated people can still be hospitalized and die. This can include people who have medical conditions that make them immunocompromised, Rock said, including those with cancer and people who have had organ transplants — in general, people who are more vulnerable.


Wearing a mask can help protect yourself from COVID-19.

Sarah Tew/CNET

Which variants are causing the breakthrough infections?

The variant causing the most concern right now is the delta variant, which is now the dominant strain in the US and other countries. This variant has caused an increase in COVID-19 cases, which is also impacting some people who are fully vaccinated. 

In comparison to the alpha variant, researchers have found delta to be 60% more transmissible, and hospitalization risks are much higher in unvaccinated people.

In most instances, the cases are happening in areas of low vaccination rates. For example, US states like Louisiana and Florida have low vaccination rates and their COVID-19 cases are surging again.

What do experts say about the efficacy of the COVID-19 vaccines?

The breakthrough infections don’t mean the vaccines aren’t effective. “The effectiveness against severe disease is still substantial,” Dr. Anthony Fauci said during a White House press briefing Thursday. “Get vaccinated. It offers good protection against disease.”

The main reason for breakthrough cases is due to the number of people who still haven’t been vaccinated. Once more people are fully vaccinated, it’ll help reduce the spread of COVID-19 throughout the world because the virus won’t be able to infect as many people.

Until then, the virus will continue to mutate and spread, creating new variants. 

For more information, here’s everything you need to know about the coronavirus delta variant. Also, here are more details about a potential COVID-19 booster shot and the debate over whether fully vaccinated people should continue wearing masks.

The information contained in this article is for educational and informational purposes only and is not intended as health or medical advice. Always consult a physician or other qualified health provider regarding any questions you may have about a medical condition or health objectives.

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