Herd immunity and COVID-19 (coronavirus): What you need to know

Herd immunity is an exceptional phenomenon that controls the spread of a disease in a population. Once that population reaches a particular threshold, everyone gets immune to the disease through either infection (recovery) or vaccination. Much has been said about achieving herd immunity for COVID-19, and today, we will take a detailed look at it.

If you experience any new COVID symptoms, get yourself checked at one of our centers in Seychelles.

How To Achieve Herd Immunity For COVID-19? 

There are two major ways to achieve herd immunity for COVID — community recovery from an infection, and vaccines.

Herd immunity can be attained when enough people in the crowd have recovered from a certain disease. That way, they develop protective antibodies against any future infection. 

While many people advocate for the spread of COVID-19 to the masses saying that takes us closer to achieving herd immunity- the matter is not so simple.

Before we start voting for mass infection, there are a number of issues we should think about.


It’s unknown for how long you are immune from the virus once you recover from it. There is no clear consensus on how long fully vaccinated people can stay safe after recovering from COVID-19. Even if you develop antibodies, you could get COVID-19 again.

2. Impact on public health 

Experts believe that when more than 200 million people (or 70% of the population of the USA) make a recovery from COVID, it will be sufficient to attain herd immunity in the country.

In any country- infecting 70% of the population can lead to a disaster. So many deaths, especially among older people, can have an adverse impact on public health. The health care system would soon get overwhelmed. People who need non-COVID-related care may not get the necessary healthcare access.

What is Herd Immunity Covid 19? 

Herd immunity is achieved when a big portion of the population becomes immune to certain infectious diseases, which reduces the spread of the disease. 

The disease spreads rapidly when only a limited number of people are sick. But when a large population has been through it, the community reaches herd immunity. It can be safe for immunocompromised people, because the spread significantly reduces. 

The portion of the population who should be immune for the community to reach the herd immunity threshold varies for each disease. For instance, highly contagious diseases like measles need almost 95% of the population to be immune, limiting disease transmission, and achieving herd immunity.

Herd Immunity Might Not Last Forever 

People infected with the SARS-CoV-2 virus develop some kind of immunity to the virus. But we don’t know for how long.

Given what’s known about the other COVID viruses and the nature of SARS-CoV-2, it seems that infection-associated immunity fades over time.

Modellers won’t be counting everybody who’s infected while calculating how close a population is to achieve the herd-immunity threshold. And they’ll have to consider that the vaccines are not 100% effective. If infection-based immunity lasts for a few months, that gives us a tight deadline for delivering vaccines.

It will also be important to understand how long vaccine-based immunity lasts. We also must consider if boosters are necessary over time. 

How To Build Immunity Against Covid? 

Whenever possible, get a COVID-19 vaccine. If you’re fully vaccinated against COVID, you can safely return to resume normal activities. However, if you live in an area with a high number of new COVID-19 patients, Center for disease control recommends wearing a mask indoors. Also, put on the mask outdoors in crowded areas or when in close contact with people who aren’t fully vaccinated.

If you have not taken the vaccine for COVID19, take these steps to reduce the risk of infection:

  • Maintain distance among yourself and others (within about 6 feet). This is especially significant if you have a weaker immunity, leading to a higher risk of serious illness. Remember that some people may be asymptomatic and spread the disease to others.
  • Avoid close contact (2 meters) with anyone sick.
  • Wash your hands with soap and water for 20 seconds at least, or use an alcohol-based hand sanitizer containing 60% alcohol.
  • Wear a face mask indoors. If you are in an area with a lot of new COVID-19 cases, wear a mask outdoors in crowds or when in close contact with others who are unvaccinated.
  • Cover your nose and mouth with your elbow or tissue while you cough or sneeze. Dispose of the used tissue.
  • Do not touch your face, mouth, eyes, and nose.
  • Do not share dishes, glasses, bedsheets, and other household items in case you’re sick.
  • Clean and disinfect the surfaces, such as doorknobs, counters, light switches, and electronics, daily.
  • Stay home from school, work, and public areas if you’re sick. Only go out if you want to seek some kind of medical care. Avoid public transportation such as taxis or cab-sharing if you’re sick.

How To Build Immunity Against Covid By Vaccination? 

Herd immunity is possible when enough people get the vaccines and develop antibodies against future infection. Unlike the usual infection method, vaccines create immunity without resulting in  complications or causing illness. Through the concept of herd immunity, vaccines have controlled contagious diseases such as diphtheria, smallpox, rubella, polio, and many others.

Herd immunity enables us to protect the population from a disease, even those who are not eligible for vaccination, such as infants/newborns or those who have weaker immune systems.

However, reaching herd immunity through vaccination against COVID-19 might be difficult for many reasons. For instance:

Vaccine hesitancy 

Some people might avoid getting a COVID vaccine because of religious objections, fear about the side effects, risks, or skepticism about the benefits. If the portion of vaccinated people in a community is less than the herd immunity threshold, the contagious disease can continue to spread.

Unspecified protection period 

We are not sure how long the COVID-19 vaccines can protect us from COVID. Further research is necessary to see in this area.  Also, research suggests that COVID-19 vaccines might be less effective against some COVID variants. New variants, which can be more resistant to vaccines, are repeatedly emerging.

Uneven vaccine roll-out 

The supply of COVID-19 vaccines has significantly varied among and within countries. If a community achieves a high COVID vaccination rate and surrounding areas don’t, outbreaks could occur if the population’s mix.

Can You Build Coronavirus Immunity From Herd Immunity? 

Yes, herd immunity to COVID is achievable, but it does not mean that we can achieve everlasting immunity.  Returning to life as before the pandemic, without seeing coronavirus outbreaks, is unlikely to happen for several years.

The reasons that hinder achieving herd immunity are:

  • Vaccine hesitancy and skepticism

First, it is proving much harder to get people vaccinated against COVID than against measles. As of September 2021, just half of the United States population was vaccinated against COVID-19. Although we know that the FDA authorized vaccines (FDA approved) are safe and have been highly effective against new variants like the delta variant.

  • No vaccines for children

The second is, young children are still not qualified for the vaccine, and more (susceptible to COVID-19) are born every day. Until we get vaccines that are good to use for all ages, spread of the coronavirus among kids, (who would be able to infect adults, especially unvaccinated ones) is likely to continue.

  • No vaccine is 100% effective

Vaccines against COVID-19 are very effective and vividly reduce the risk of infection. However, they do not narrow down that risk to zero. Vaccinated people can still become infected (breakthrough infections), and people who have had COVID-19 can get it again. This means that we will need an even higher level of vaccination against COVID to achieve herd immunity.

For these reasons, it will be very difficult to get to the level of population immunity against COVID that we have seen with measles in the US. Hence, we should expect to see some level of continuing coronavirus transmission in our population for a couple of years (if not forever). But as we build immunity against SARS-CoV-2, the risk of severe illness will decline, and future waves of infection will not be as disruptive.


Vaccines are our best bet against COVID-19. We are still not sure if contracting this disease gives us lasting immunity against reinfection. To reach the herd immunity threshold, a large number of people have to get the infection and recover from it. However, a situation like this can overwhelm the health care system and lead to deaths and complications.

To stop the transmission of COVID-19, keep your distance from others, wash your hands often with soap and water. Use a sanitizer containing at least 60% alcohol, and put on a mask in public spaces. 

To stop the spread, get yourself tested at one of Seychelles Medical’s centres and stick to a proper care regimen.

Frequesntly Asked Questions

Researchers found strong immune responses in the majority of people studied. Antibodies against the protein of SARS-CoV-2, which the virus uses to get into cells, were present in 98% of participants one-month post symptom onset. As observed in previous studies, antibodies vary widely between individuals. But, their levels remained fairly stable over time, declining only discreetly at 6 to 8 months after infection.

The research, appearing in The Lancet Microbe, shows that unvaccinated people might expect immunity against reinfection to last 3–63 months after catching COVID-19. 

Sleep. We restore our bodies when we sleep. A healthy immune system can fight infections more than a sleep-deprived immune system. Teens and adults should get six to eight hours of sleep a night. Maintain a regular bedtime and wake-up routine. Sleeping in a warm, dark room is a good idea. A melatonin supplement could be a good option if you have trouble sleeping.

Lower stress levels. Although you should exercise, lowering your stress levels year-round, practicing amidst this virus outbreak is important as stress directly affects your immune system. Find ways to reduce stress levels by exercising, meditating, and breathing exercises.

A balanced diet. Nutritional deficiencies make us more vulnerable to bacteria and viruses; that’s why it is important to have nutritional foods to maintain a healthy immune system. Whole foods including beans, grains, nuts, and seeds offer daily nutritional value along with sweet-tasting leafy greens and vegetables.

As COVID-19 vaccination rates rise worldwide, people have rationally begun to ask how long this pandemic will last. Its answer is uncertain. But the idea that enough people will eventually get immune to SARS-CoV-2 to block most transmission — the ‘herd-immunity threshold’ is still far off.

That threshold is generally reached only with high vaccination rates. Many scientists thought that mass vaccinations, herd immunity would let society return to normal. Most estimates had put the threshold at 60–70% of the population gaining immunity through vaccinations or past exposure to the virus.

But as the pandemic enters its third year, the thinking has begun to shift. In February, data scientist Youyang Gu changed the name of his famous COVID-19 forecasting model to ‘Path to Normality’ from ‘Path to Herd Immunity. He claimed that reaching a herd-immunity threshold was unlikely because of vaccine hesitancy, the arrival of new variants, and the delay in vaccinations for children.

Experts estimate that herd immunity would need around 80-90% of the population to have COVID immunity, either through vaccination or prior infection. That’s why experts encourage the public to get the COVID-19 vaccine.

Experts say that in the United States., 70% of the population — over 200 million people — would need to recover from COVID to halt the pandemic to achieve herd immunity?

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