Will Civilisation Need Covid Booster Doses Forever

source – olhar digital

From New York to Timbaktu, there’s one thing occupying everyone’s minds – covid-19 and the havoc it has wreaked on life. When will it end? Do vaccines really work? Why do we need boosters? How long will covid boosters be in our lives? Here’s Healtiyer’s take.


Will Civilisation Need Covid Booster Doses Forever

Over the last 3 months, it seems as if a large number of individuals are receiving Covid-19 booster doses. Pfizer BioNTech's Cominarty vaccine has been licensed in Malaysia for the elderly, as well as at-risk vulnerable groups such as those with specific health problems and healthcare frontliners. 

AstraZeneca and Sinovac have also recently submitted documents to the National Pharmaceutical Regulatory Agency (NPRA) to seek approval as a booster dose at the next meeting by the Drug Control Authority on November 19th 2021.

However, underlying the booster craze lies an unresolved issue, according to many experts: What is the purpose of the additional shot?

Individually, the answer seems simple. Boosters seem to minimise the risk of infection and, most likely, disease transmission by boosting the immune system. Consequently, receiving a booster would protect you and the people around you by decreasing your risk of infection in the first place.

However, this straightforward response raises a new set of issues. If optimum protection against any kind of Covid-19 infection is sought, does this suggest that patients should be vaccinated every three, six, nine, or twelve months as antibodies fade? Is it even feasible? And does society benefit from vaccinated individuals gaining more protection, particularly if additional doses could be used to inoculate unvaccinated people globally?

According to some experts, there is little clarity around these issues, despite some country's extensive booster strategy. Céline Gounder, an epidemiologist at New York University told Vox in an interview, “What is it that you’re trying to achieve? That needs to be clearly defined.”

However, Malaysia's Ministry of Health, which has promised and pushed for booster shots for months, is confronted with an uncomfortable reality: A booster campaign may be the best course of action at this stage of the pandemic, particularly considering who is most inclined to follow federal officials' guidance.

Every expert would agree that vaccinating individuals who have not been vaccinated is a considerably more effective way to manage Covid-19 than booster vaccinations for those who have been vaccinated. However what really needs to be taken into consideration is the fact that countries all over the world are gearing up to reopen international borders in the near future, in a bid to mend the damages covid-19 brought upon global economies. 

Bearing this in mind, after a year, only around 70% of US people aged 18 and older are fully vaccinated. Approximately one in five individuals in the US continue to be determined that they will never be vaccinated or would do so only if it is mandatory. Months after campaigns urging individuals to be vaccinated, those who remain unvaccinated seem to find it incredibly hard to embrace the vaccinated.

Individuals who have previously had vaccinations are usually more receptive; after all, they have already received their initial shots. Therefore, for the Biden administration in the US, pressuring these individuals to have another shot may be the simplest way to raise population-level immunity, even though it would be ideal to persuade unvaccinated individuals to receive a shot or two instead. It is a realistic assessment of what can be accomplished today, rather than a pursuit of the ideal. 

Still, there is much disagreement around the why, who, and when of booster injections. Even professionals who devote their lives to this subject do not have all the answers to fundamental concerns, ranging from whether declining immunity is a significant issue to what a “booster dose" is. 

These unsolved concerns make it more difficult to evaluate the purpose of booster doses — and whether the benefits actually outweigh the risks.

source - clinical trials arena

Does Waning Immunity and Declining Antibody Levels Really Pose A Threat?

The primary argument for booster injections is that vaccine protection tends to decrease with time. However, even here, there is much experts do not know and array of conflicting information.

According to some studies, vaccine-induced immunity against any Covid-19 infection, even those that cause no disease or just moderate symptoms, does diminish. Between May and July 2021, the Centers for Disease Control and Prevention (CDC) observed that vaccine efficacy against infection decreased from 92% to 75% among New York adults. A more recent study published in Science revealed that between February and October 2021, vaccination efficacy against infections among military veterans decreased from 88% to 48%.

Vaccines still provide some protection against illness; 75% or 48% is better than 0%. Separate studies from the Netherlands and the United Kingdom have also shown that vaccinations continue to significantly lower the probability of transmission — not to zero, but to a statistically significant level.

Furthermore, vaccine-induced protection against severe illness and mortality has been mostly maintained. The vaccine's efficacy against hospitalisation was more than 93% in the New York study. Vaccine protection against mortality was 82% for veterans under the age of 65 and 72% for those 65 and over in the veterans study. Additionally, CDC statistics through September 2021 indicated that individuals who are not completely vaccinated are 11.3 times likelier to die from Covid-19 than those who are fully vaccinated.

Experts genuinely do not know how much these statistics reflect the waning of vaccination protection against the delta variant's superior ability to evade antibodies. Additionally, there are statistical paradoxes that may obfuscate all of this data.

source - roche

Nonetheless, doctors believe there is reason to anticipate that protection against any infection may eventually wane: Antibodies fade with time. That is natural; that is how our immune system functions. However, if the immune system retains certain defenses and is capable of activating them in the event of infection, an individual may get unwell and perhaps transmit the virus but will be mostly protected from hospitalisation and death.

“When people come into the hospital, they’re not in the ICU because they’ve not gotten a third dose, they’re in the ICU because they haven’t gotten any doses.” Paul Offit, director of the Vaccine Education Center at the Children’s Hospital of Philadelphia, told Vox in an interview. 

Infection immunity may be waning as a result of the new normal. Numerous specialists now anticipate that Covid-19 will become endemic, persisting in a similar manner as cold and flu viruses. However, in that case, the virus will very certainly be eradicated by a combination of natural and vaccine-induced immunity, as well as improved medications and other treatments.

“I’m still seeing on Twitter the desire for elimination, but it’s not going to happen. We’re so lucky. We prevented the worst thing that could ever happen, which is to get super sick from a horrible new virus,” Dr Monica Gandhi, an infectious disease expert at UC San Francisco, told Vox.

Perhaps, in the long term, waning immunity to infection may not be such a huge concern.

However, we are not there yet. As the world shifts towards endemicity and eventually reopens international borders, other country's vaccination rates and population immunity need to be taken into consideration.  Much of the global population remains unvaccinated, and thousands still die from Covid-19 daily across the world. At the moment, there is just too much transmission, too many variants emerging and increasing burdens on the medical systems. The entire world still requires protection from this deadly virus in the form of vaccinations, for now.

This implies that booster doses may eventually become situational. They may make sense, particularly for vulnerable populations, during periods of high risk of outbreaks (such as the autumn and winter), but we would not be bound in an endless cycle of vaccinations every few months for the rest of our lives.

This leads to another point.

source - the conversation

Who Truly Needs Booster Shots?

Experts agree on two cohorts of people that benefit from receiving booster shots: the elderly (60 years and older) and the immunocompromised.

There are two critical issues for older adults. To begin, this group has historically been far more susceptible to die from Covid-19.  Two, older immune systems seem to benefit less from vaccinations or, at the very least, see protection decrease more rapidly; as discovered in a study of veterans, vaccine efficacy against mortality was around 10% lower in those 65 and older compared to those younger than 65.

Meanwhile, immunocompromised individuals may receive little, if any, benefit from only two injections of the Pfizer/BioNTech, Sinovac or AstraZeneca vaccines.  However, there is some evidence that an extra dose may boost protection levels.

Apart from these two cohorts, “there’s just not great evidence for boosting,” Dr Gandhi added.

There is even an argument to be made that no one should get a booster injection while such a large proportion of the world population remains unvaccinated. Supplies — as well as the time, effort, and other resources required to conduct a vaccine campaign — are few. Each booster dose given to a previously vaccinated individual may be administered to an unvaccinated individual somewhere else in the world, where vaccination rates are much lower. As long as covid-19 spreads uncontrollably worldwide, it is more likely to mutate into a more lethal, infectious, or immune-evading variant of covid-19.

“It’s not just about morality and ethics, we are so losing sight of what is most important here,” Gounder added.

Nonetheless, it is likely that some individuals may need boosters even after worldwide vaccination efforts ramp up. And, in the meantime, some individuals are receiving boosters regardless. For the time being, an agreement exists that elderly adults and immunocompromised individuals should be prioritised. However, there is a great deal of cynicism among the general public – out of fear that the additional doses for vaccinated individuals do not outweigh the cost-benefit analysis.

That is OK, but should you, the reader, get a booster shot? The majority of experts have advised that everyone should register if they are eligible.

For one thing, it is always better to be safe than sorry when it comes to one's own health. And, while it may be preferable for the dose you're receiving to be distributed elsewhere, that shot's fate has already been determined — it's been purchased by the federal government for domestic use and distributed to your doctor's office, or wherever else you're receiving a vaccine. This is an issue that has to be addressed at the policy level, not by people boycotting booster doses.

However, there is another issue to consider: when to get a booster shot.

source - Osservatorio Balcani e Caucaso Transeuropa

How Often Will People Require Booster Doses?

Honestly speaking, no one really knows how often booster doses will be needed.

How long does booster dose protection last? How frequently do we need booster doses? Will we need boosters forever? What are the long-term health implications of booster doses? Experts don’t seem to know the answers to these questions. 

Recent evidence suggests that vaccine-induced immunity begins to decrease after a few months. However, this is only true once an individual has been fully vaccinated for the first time.

There is reason to believe that a booster dose might have a longer-lasting impact. “There’s some reasons to believe, immunologically, that once you get a booster six months after your second shot, that that should have a lot more durability than the first two shots did,” Brown University School of Public Health dean Ashish Jha told Vox. But, right now, we “can’t prove that. We don’t know for sure. We don’t have that long-term data.”

Even if vaccine-induced immunity does decline, there are other factors to consider. If Covid-19 cases are low in six, eight, or twelve months, vaccination protection against severe disease and death is sufficient, and particularly if few people die from the virus, maybe using boosters to slow the spread of the disease is not worth it.

There is a danger associated with excessive boosting: vaccine-related adverse events, including uncommon but potentially fatal diseases such as myocarditis (inflammation of the heart muscle). “Every time you boost your immune response, especially with [Moderna and Pfizer’s] mRNA vaccines, you do have a certain percent of people who are going to get myocarditis,” Offit said. Even with uncommon conditions such as myocarditis, “if there’s not a clear benefit to that booster dose, that serious adverse reaction becomes more important.”

As the virus spreads globally, one feasible model is an annual Covid-19 dose akin to the flu vaccination. It is currently possible to get a flu vaccine and a Covid-19 booster at the same time in American pharmacies, so it is logistically viable. This would help limit transmission to a minimum, therefore preventing the virus from retaliating.

However, all of this is theoretical. Experts agree on just one point: we need further data.

source - the straits times

Why Are Booster Doses More Important Now Than They Were In September

The basic justification for booster doses was straightforward: certain individuals need more protection against Covid to avoid hospitalizations and fatalities, but the majority did not. For the vast majority of completely vaccinated individuals, contracting Covid resulted in relatively minimal symptoms or none at all.

This paradigm has shifted, according to Dr. Colleen Kelley, an associate professor of medicine in Emory University School of Medicine's division of infectious diseases. The virus that causes Covid continues to spread, primarily because millions of people around the world are still unvaccinated, and vaccination protection is eroding more rapidly than researchers anticipated two months ago.

This indicates that the likelihood of developing a new infection in fully vaccinated individuals — with potentially dangerous symptoms — is growing. Booster injections, Kelley adds, may boost antibody levels enough to help avoid such infections and reduce or eliminate any breakthrough symptoms.

Israeli researchers published a study last month comparing the rates of breakthrough infections in individuals four to six months after becoming fully vaccinated. Six months later, the rate almost quadrupled to 3.3 cases per 1,000 individuals, up from 1.7 cases per 1,000 people at four months.

“While the Delta variant surely has played a role in the resurgence of Covid-19 in recent months, these findings suggest that waning immunity also is an important factor,” Dr. Francis Collins, director of the National Institutes of Health, addressed the Israeli study in a blog post.

“Boosters have a role there to pick that up, and not allow so much breakthrough to occur,” Christopher Mores, a global health professor at the George Washington University Milken Institute School of Public Health, told CNBC Make It.

source - guidelines

Why You Should Get Your Booster As Soon As You Are Eligible

Each person's health and risk profile are unique, so consult your doctor before proceeding – but in general, most individuals should have a booster dose once eligible. According to experts, this is a low-risk, high-reward strategy.

“There’s no indication that there’s something inherently risky about obtaining a booster of this vaccine,” Mores added. “There is certainly something inherently risky about becoming infected with Covid.”

You should schedule a booster injection in advance if you expect to spend time inside with other people throughout the holiday period, advises Dr. Sadiya Khan, assistant professor of medicine at Northwestern University Feinberg School of Medicine, in an interview with CNBC.

The more pressing matter may be which booster to get. Malaysians do not have a choice in the matter, for now. The majority of Malaysians received Sinovac’s covid vaccine as their first and second dose, however, Malaysia’s Ministry of Health and NPRA has only authorised Pfizer BioNTech’s Cominarty vaccine as a booster dose. 

Despite this, AstraZeneca and Sinovac have recently submitted documents to the National Pharmaceutical Regulatory Agency (NPRA) to seek approval as a booster dose at the next meeting by the Drug Control Authority on November 19th 2021. So Malaysians can keep their hopes up and anticipate being able to make a choice in the matter.

All things considered, accepting that we need booster doses moving forward, may be the key to a quicker return to normal life in the near future. 

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