Can Vaccines Keep With Coronovirus Mutation? Bay Area variants will be a test


The discovery of several new variants of the coronavirus, which can spread more easily, including mutations occurring in the Bay Area in December, makes it even more necessary to correct the nation’s troubled vaccination rollout – another boom or learning before it develops Causes. To avoid vaccines.

Throughout the epidemic throughout the year, public health experts have advised that beating the virus was a marathon, which social remediation measures would take several months to win. This is still true. But in many ways, the race has intensified in recent weeks: amid a virus that is fleshing out new mutations that can be difficult to contain and a vaccination campaign marked by recurring idioms.

“We’re really in a race now,” UCSF virologist Dr. Charles Chiu said to have identified the L452R variant that has flown in parts of the Bay Area in the past month. “This only increases our urgency to vaccinate the population before additional variants develop and emerge.”

A worrying aspect: the more coronoviruses are circulating in the community, the more new opportunities are likely to change and develop. And more viruses have never occurred in California and the United States so far – and many other countries are also struggling to contain it, creating greater risks in a mutual world.

“By letting the virus run wildly, we are allowing it to accumulate a lot of mutations. And some of them may be beneficial for the virus, ”Dr. Catherine Belisch, an infectious disease specialist at Stanford. “The best thing we can do right now is to get the vaccine delivered to as many people as possible, so as to reduce the overall infection burden, so we are accumulating fewer mutations.

“We can’t stop the virus from mutating,” she said. “But we can really gain the upper hand here.”

The US and California particularly occupy an uncertain place in the epidemic. The country reported a total of 400,000 deaths from COVID-19 on Tuesday, and in California, daily cases and deaths are much higher in the week.

Meanwhile, the vaccination campaign that is needed to avoid the epidemic in the country has been beset by problems at both the state and national levels – most recently in California with 330,000 modern doses of concern due to allergy concerns.

A new version, or more than one, has the potential to make a bad situation worse. If the more infectious version of the virus takes over, it may reinvigorate a surge that is just beginning to stop. And it could potentially weaken vaccination efforts if vaccines are less effective against it.

The immediate threat to the Gulf region and the rest of the state from the new areas is not yet clear. The highly infectious B117 variant that is widespread in the United Kingdom has been identified in Southern California, but only in a few dozen cases. But the Centers for Disease Control and Prevention warned last week that this variant could become the dominant version of the virus in the US in March itself, and it could bring a massive new surge of cases.

The L452R variant, which was announced to have a presence in California on Sunday, seems to have set foot in parts of the state and has been tied to several major outbreaks in Santa Clara County, but scientists are unaware that it is from the virus Is more contagious. The type that is still operational in California. If the L452R becomes more contagious, it is unclear how the competition between it and the B117 version will occur.

The B117 variant is not capable of ejecting vaccines, but scientists are not aware of the L452R variant. Neither causes more serious illness – although a more contagious virus will inevitably lead to more disease and death.

The emergence of two new variants in California, with at least two more spread to other parts of the world, raises new concerns about whether mutations may still come together or may already occur here and yet It has not been detected. Experts say that with the introduction of these variants it becomes more apparent than ever that the epidemic should be contained quickly.

The chairman of the department, Dr. Robert Wachter said, “With 3,000 or 4,000 people a day (in the United States) we were already in a race with the virus that we knew, and now we’re going to add another element.” Drug use at UCSF “It’s like you’re in a race and suddenly the person you’re running against is all 50% faster.

“Once we had two amazingly effective and safe vaccines, that’s really how fast you could get into people’s arms,” ​​he said. “Not only the dangers that were apparently quite obvious, but the emerging dangers that will be exposed for longer.”

The coronavirus, like all other so-called RNA viruses, is regularly mutated. But the COVID-19 virus mutates slower than many other viruses, adopting only one or two mutations a month. Most of those mutations have little or no effect. Some viruses reduce their chances of survival. Other mutations make it less or more contagious. Or they change the way the virus interacts with the body’s immune system, making it a more challenging target for natural immunity or a vaccine.

When enough mutations are produced, a new variant emerges that is genetically distinct from its parents and behaves in a different way. The B117 variant has 23 mutations and is much more infectious than its parent. Another variant found in South Africa also appears to spread more easily.

The L452R variant has five mutations. Infectious disease experts worry that it may also become more contagious, if only because of how quickly it catches up in the region and other parts of the state. But they do not yet know how those mutations affect its behavior.

So many variants have been detected in such a short order that creates a more worrying situation: this coronovirus is mutating faster than most scientists thought. This is possible due to part of simple mathematics – a lot of viruses are circulating around the world right now, even at a slow mutation rate, changes are piling up.

Public health experts say that at the moment, there is no evidence that the new variants are not susceptible to vaccines. But laboratory tests suggest that some variants, including L452R, have a mutation that may make vaccines less effective. Much research needs to be done, Chiu and others said.

The good news is that a new type of vaccines now being used, infectious disease experts said, can be easily modified. This is not an ideal situation, however – it would certainly complicate an already chaotic vaccination campaign. And identifying new variants will require more aggressive surveillance efforts and determining how well vaccines work against them.

Infectious disease experts say the possibility of developing a version of the vaccine may be more pronounced as more people vaccinate. Vaccine people pressurize the virus to survive it. Random mutations that allow the virus to escape the vaccine will have a favorite – and are more likely to replicate.

“If you have a circulating virus that now faces immune control (from a vaccine), you will help to develop very high-probability variants that will adapt and grow optimally,” Gladstone Institute of Director of Virology Drs. Melanie Ott said. , An independent research group in San Francisco.

He also said that a clumsy vaccination program that left large gaps in protection could create a greater likelihood of variants emerging that could avoid vaccines, she said. Vaccines have not yet been used in most parts of the world, so even though the United States has christened the virus, it has to be vigilant about viruses reaching across borders.

Until the herd immunity is attained and the virus stops circulating, variants will remain an issue.

“If we are very slow, we will potentially have variants that may be less sensitive to the vaccine. We will have a situation where the vaccine is partially inactive, ”Ott said. “We have to get as many people vaccinated as soon as possible, so we have as few viruses as possible.”

Erin Alday is a San Francisco Chronicle staff writer. Email: [email protected] Twitter: @erinallday

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