Tuesday, May 30, 2023

Why Do Some Vaccines Last A Lifetime

How Good Is The Immune Response

Why do some vaccines last a lifetime while others do not?

Vaccines aim to mimic natural immunity. By exposing the body to harmless imitations, they create an immune memory, teaching the body to recognize infections from disease-causing pathogens. When an infection is recognized, an immune response is mounted, with antibodies latching onto the invaders and preventing them from causing illness. T-cells, which can attack pathogen-infected cells, are also crucial to the bodys defences.

All vaccines, including the COVID-19 vaccines, produce an immune response, but the strength of that response, and the duration of the resulting antibodies, varies depending on the effectiveness of the vaccine.

And different levels of antibodies are required to protect against different viruses and bacteria.

Measles antibodies tend to be fairly long-lasting, so there are sufficient levels circulating in the body to ward off infection for years after vaccination. Research is still ongoing into the level of antibodies required to protect against COVID-19.

Where Can I Get Affordable Immunizations For My Child

Clearly, vaccines are one of the best tools we have to keep kids healthy. But they work best when everyone gets them. Vaccines are now required to be covered by health insurance plans with no charge to the patient. Some insurance plans only cover vaccines when they are given by your doctor or at specific locations. So check with your insurance company to make sure. You can also get inexpensive or free vaccines through many local public health clinics and community health centers, and campaigns to vaccinate kids often hold free vaccination days.

The U.S. government’s Vaccines for Children program covers Medicaid-eligible, uninsured Alaskan and Native American populations, and some underinsured kids for routine immunizations up to 18 years of age. The vaccines are provided by the government and administered in a doctor’s office. But the doctor’s visit itself is not covered . Some public health clinics may cover both the visit and the immunizations.

When Were Vaccines Developed

Vaccines are not new immunisation techniques were pioneered over 200 years ago, when smallpox was a feared and deadly disease. An eighteenth-century doctor named Edward Jenner noted that workers on farms who contracted the mild cowpox disease were immune to smallpox. Jenner guessed that the germ responsible for cowpox was similar enough to the smallpox germ to train the immune system to defeat both diseases. He was correct. Immunisation in Australia today relies on similar principles.

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Heres Why Seasonal Flu Vaccines Only Last A Few Months

  • With the COVID-19 pandemic already straining healthcare centers, this year its more important than ever to get your annual flu shot.
  • The flu virus changes yearly as multiple strains spread throughout the community and the virus adapts itself for survival.
  • It takes between 3 and 4 weeks for someone to develop immunity against the predicted strains of influenza after getting the flu shot.

The current pandemic has overwhelmed us with concerns about COVID-19, but theres a disease that routinely causes of deaths.

It affects millions of Americans every year, and its called influenza.

With the COVID-19 pandemic already straining healthcare centers, this year its more important than ever to get your annual flu shot.

While vaccination rates are relatively falls far below other vaccination rates.

One reason is that people have to get them every year, unlike vaccines for measles or mumps that require only a few doses for a lifetime.

So why doesnt the vaccine protect us long term?

Where Can I Find Out More About Immunizations

States hound parents about kids hearing tests. Why not about vaccines ...

Read Your Child’s Immunizations for details about each recommended immunization. You also can visit the CDC’s National Immunization Program website for more information about vaccinations.

And talk with your doctor about which immunizations your kids need. Working together, you can help keep your family healthy.

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Why Do I Need Boosters For Some Vaccines But Not Others

Similar to our natural active immunity, vaccine-induced immunity also undergoes the learning process of developing memory cells. So why is it that some vaccines seem to elicit a better learning response and grant us life-long immunity? While others sometimes require yearly boosters like the flu jab?

How long a vaccine lasts comes down to various factors. And unfortunately, there are still many gaps in our knowledge about how to create the ideal conditions for long-term vaccine-induced immunity across different diseases. However, here’s what we know so far:

Antibodies have different decay rates, and memory cells take time to develop

Firstly, antibodies don’t last forever and their rate of decay matters. For diseases like measles, this rate is relatively slow. The antibodies seem to stick around for longer and vaccine-induced immunity remains quite durable over time.

For some other vaccines , the antibodies get broken down faster. Scientists combat this with booster shots to cause a larger immune response to make up for its faster decay so that the overall threshold for protection is still met over time.¹²

Sometimes, memory cells also take time to develop and they only work in the presence of an infection or vaccine. If the vaccine from the first dose has waned, memory cells stop working. So boosters are there to also make sure that the memory cells stay active.¹³

Type of vaccine technology matters

Viruses mutate at different rates

Vaccine Efficacy And Effectiveness

Vaccine efficacy and effectiveness are measures that compare the rates of disease between vaccinated and unvaccinated people. Efficacy is measured in controlled clinical trials, whereas effectiveness is measured once the vaccine is approved for use in the general population. From these we can identify the proportion of vaccinated people we would expect to be protected by the vaccine.

Herd immunity is an important mechanism by which the larger community is protected. For some diseases, if enough people are immune then transmission of the disease is reduced or eliminated. This is particularly so for diseases such as rubella and pneumococcal disease. High vaccine coverage must be maintained in order to prevent the disease re-entering the population.

No vaccine is 100% effective, a small percentage of people are not protected after vaccination and for others the protection may wane over time. Also, some people are unable to be vaccinated due to certain conditions such as immune suppression. Maintaining immunity in those around these people protects them from disease.

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/8how Does The Protection Differ From Other Vaccines

The effectiveness of a given vaccine depends on a lot of likely factors- from the rate of decaying antibodies, the immune response the vaccine induces, location of the infection and lastly, mutations. Some of the other vaccines which are routinely used offer surprisingly higher odds of protection. The tetanus shot, chickenpox vaccine prevent infections for upto 10-12 years, the flu vaccine undergoes changes and the measles vaccine lasts for a lifetime.

Even though the protection and timeline of protection offered vaguely differs from other vaccines, researchers do tell that the COVID-19 vaccine fulfills all requirements, and provides three-pronged immune defense- from infection transmission , severity and mortality of illness.

/8what Do We Know About Lifetime Protection With Coronavirus Vaccines

Some expired COVID-19 vaccines, gets adjusted shelf life

It remains unclear whether or not, lifetime immunity, i.e. antibodies which completely cut out chances of contracting COVID-19 over the course of lifetime, could be possible with the vaccines we have.

Not only do we have a lot of current evidence about the weakened defence mounted by the vaccines, factored by variants, researchers feel that it’s right now, extremely far-sighted to think that COVID-19 vaccines could offer long-term protection, even if booster shots become a mandate in the coming months. Even with high odds of efficacy mapped with these vaccines, one of the prime reasons we are seeing a shockingly fast lowering down of prevention is the very nature of the virus, which also makes it so different from other vaccines in use.

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There’s A Vaccine For Hpv

Human papillomavirus is a common sexually transmitted virus and it can cause cancer. You can have HPV and pass it on without knowing it. The virus is spread by skin-to-skin or oral contact, so you don’t have to have intercourse to get it, and using a condom doesn’t fully protect you from the virus.

There are many types of HPV. Some cause warts on the genitals of both males and females. And the really bad news is that HPV can cause cancers, like cervical, vaginal, vulvar, penile, anal, throat, tongue and others!

Now for the good news! You can protect yourself against many of the types of HPV that cause warts and cancers by getting the HPV vaccine. The sooner you get it the better.

Here are the common vaccines you should get as a teen.


What Is In Vaccines

Depending on the infection, ingredients in vaccines can vary. They may also change from year to year as new strains of viruses appear. Some vaccines may contain a small dose of:

  • A live germ.
  • Dead germs.
  • Small parts of germs .
  • Inactivated toxins produced by bacteria.
  • Antibiotics or preservatives to stop the vaccine from becoming contaminated or going off.
  • Diluents .

Alternatively mRNA vaccines teach our cells how to make a protein that stimulates an immune response.

Australia has strict rules on vaccine safety. Before a vaccine is registered by the Therapeutic Goods Administration and made available to the public it goes through rigorous testing. And, even when it is used, it is constantly monitored for safety and effectiveness.

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Unscramble The Word To Learn About Vaccination

Hint: all answers can be found throughout this guide!

  • LPXSOLMA – There hasn’t been a case of this disease since 1977
  • DEELEN – Vaccines are given through this method, rather than through the mouth, because saliva can break down the vaccine
  • PHV VEICNCA – A vaccine that can prevent many types of cancer
  • SOOBTER THSOS – Some vaccines last a lifetime, others require more doses. These are called. . .
  • PPA ZINUANMCMEI – Something really useful that lets you keep track of your vaccinations
  • Answer key:

    How Long Does Immunity Last After Getting A Vaccine

    Why some may need just one vaccine shot

    A few vaccines, like the two for measles or the series for hepatitis B, may make you immune for your entire life. Others, like tetanus, last for many years but require periodic shots for continued protection against the disease.

    The whooping cough vaccine also does not give lifelong immunity, and that may be one reason why outbreaks still happen. Whooping cough isn’t a serious problem for older kids and adults, but it can be for infants and young children. Because of this, teens and adults now receive a pertussis booster along with the tetanus and diphtheria booster an important step in controlling this infection, particularly for pregnant women and other adults who will be around newborn babies.

    It’s important to keep a record of vaccinations so the doctor knows when your kids are due for a booster. Also make sure your kids get the flu vaccine each year. Having been immunized last year won’t protect someone from getting the flu this year because flu viruses constantly change. The vaccine is updated each year to include the most current strains of the virus.

    The flu vaccine reduces the average person’s chances of catching the flu by up to 80%. It can’t prevent infection by all viruses that can cause flu-like symptoms, though, so being immunized isn’t a guarantee that someone won’t get sick during flu season. Still, even if someone who’s gotten the vaccine has the flu, symptoms usually will be fewer and milder.

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    How Are Vaccines Made And How Do They Work

    Type: Guide

    Date published: 2018-08

    First, researchers must spend time isolating and studying the virus or bacteria that causes the disease. Then, they must figure out how to isolate and produce weakened or dead germs that, when introduced into your body, will teach it how to build antibodies that fight the disease without causing any symptoms of the disease itself.

    Next, the scientists figure out the correct quantity of the vaccine to give and how long the protection lasts. The vaccine is then tested and retested in the lab. It is then used in many clinical trials, where it is given to an increasing number of volunteers. Finally the vaccine is determined to be safe to use. On you!

    For you, it’s just a very fast shot in the arm, but the journey it takes to get there is a very long and careful one, designed with nothing but your good health and safety in mind.

    Can A Vaccine Give Someone The Disease It’s Supposed To Prevent

    It’s impossible to get the disease from any vaccine made with dead bacteria or viruses or just part of the bacteria or virus.

    Only those immunizations made from weakened live viruses like the chickenpox and measles-mumps-rubella vaccines could possibly make a child develop a mild form of the disease. But it’s almost always much less severe than if a child became infected with the disease-causing virus itself. However, for kids with weakened immune systems, such as those being treated for cancer, these vaccines may cause problems.

    The risk of disease from vaccination is extremely small. One live virus vaccine that’s no longer used in the United States is the oral polio vaccine . The success of the polio vaccination program has made it possible to replace the live virus vaccine with a killed virus form known as the inactivated polio vaccine . This change has completely eliminated the possibility of polio disease being caused by immunization in the United States.

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    How Often Should I Get Vaccinated

    Now that you know keeping your shots up to date is a really smart thing to do, you should know when you need them.

    In Canada, each province and territory has its own vaccination schedule. So talk to your healthcare provider or public health nurse about what vaccines you need and the best time to get them. Some may be offered free right in your school. Now that’s convenient!

    How Successful Are Vaccines

    New studies find Covid-19 immunity could last years or a lifetime

    Vaccination is the most effective preventative measure against infectious diseases. Most vaccine-preventable illnesses are highly contagious, spread quickly and can cause severe complications which may impact on our quality of life.

    Vaccines give us immunity without us getting sick. They also protect vulnerable people in our community who cannot be immunised such as very young children or those who are too sick.

    When enough people in the community are vaccinated, the spread of a disease slows down or stops completely. So as long as enough people are vaccinated, diseases will not spread. We call this herd immunity or community immunity. The percentage of people who need to be immune in order to achieve herd immunity varies with each disease. For example:

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    How Are Vaccines Studied And Improved

    The FDA’s Center for Biologics Evaluation and Research is the government agency that regulates vaccines in the United States. Working with the CDC and the NIH, they continuously research and monitor vaccine safety and effectiveness.

    New vaccines are licensed only after thorough laboratory studies and clinical trials, and safety monitoring continues even after a vaccine has been approved. There have been and will continue to be improvements that will minimize potential side effects and ensure the best possible safety standards.

    How Mrna Vaccines Work

    mRNA is a piece of genetic material that cells use as “instructions” to create certain proteins in the body. It is like a bit of computer code.

    When it’s not inside a cell, mRNA needs protection to keep it from disintegrating. This is why the vaccines require cold temperature storage. To keep the mRNA from disintegrating when it enters the body, the COVID-19 vaccines use fat bubbles to shuttle the mRNA to certain cells.

    The mRNA instructs these cells to create “spike proteins.” These proteins simulate part of the SARS-CoV-2 cell structure and trick the body into believing it’s infected with the virus.

    In the case of the mRNA vaccines, your body is never exposed to the germ but is still able to produce an effective immune response.

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    Memory Is Key To Long

    Then come the real veterans of the immune system, which can provide long-lived and strong immunity against an infection based on their past experience.

    After performing their tasks of clearing the infection or the spike protein of the virus, the antibody-producing B cells and killer T cells get converted into what are called memory cells. When these cells encounter the same protein from the virus, they recognize the threat immediately and mount a robust response that helps prevent an infection.

    This explains why multiple doses of COVID-19 vaccines that increase the number of memory B cells prevent reinfection or breakthrough infections better when compared with a single dose. And a similar increase in memory killer T cells prevents severe disease and hospitalization.

    Memory cells can remain in the immune system for long periods sometimes even up to 75 years. This explains why people develop lifelong protective immunity in certain cases, such as after measles vaccination or smallpox infection.

    The trick, however, is that memory cells are highly specific. If new strains or variants of a virus emerge, as has been the case numerous times during the COVID-19 pandemic, memory cells may not be as effective.

    This raises the question: When do these different key players of the immune system emerge after infection, and how long do they last?

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