https://www.yahoo.com/news/next-big-covid-variant-could-100250868.html

Even as daily new COVID cases set all-time records and hospitals fill up, epidemiologists have arrived at a perhaps surprising consensus. Yes, the latest Omicron variant of the novel coronavirus is bad. But it could have been a lot worse.

Even as cases have surged, deaths haven’t—at least not to the same degree. Omicron is highly transmissible but generally not as severe as some older variants—“lineages” is the scientific term.

We got lucky. But that luck might not hold. Many of the same epidemiologists who have breathed a sigh of relief over Omicron’s relatively low death rate are anticipating that the next lineage might be much worse.

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Fretting over a possible future lineage that combines Omicron’s extreme transmissibility with the severity of, say, the previous Delta lineage, experts are beginning to embrace a new public health strategy that’s getting an early test run in Israel: a four-shot regimen of messenger-RNA vaccine.

“I think this will be the strategy going forward,” Edwin Michael, an epidemiologist at the Center for Global Health Infectious Disease Research at the University of South Florida, told The Daily Beast.

Omicron raised alarms in health agencies all over the world in late November after officials in South Africa reported the first cases. Compared to older lineages, Omicron features around 50 key mutations, some 30 of which are on the spike protein that helps the virus to grab onto our cells.

Some of the mutations are associated with a virus’s ability to dodge antibodies and thus partially evade vaccines. Others are associated with higher transmissibility. The lineage’s genetic makeup pointed to a huge spike in infections in the unvaccinated as well as an increase in milder “breakthrough” infections in the vaccinated.

That’s exactly what happened. Health officials registered more than 10 million new COVID cases the first week of January. That’s nearly double the previous worst week for new infections, back in May. Around 3 million of those infections were in the United States, where Omicron coincided with the Thanksgiving, Christmas, and New Year holidays and associated traveling and family gatherings.

But mercifully, deaths haven’t increased as much as cases have. Worldwide, there were 43,000 COVID deaths the first week of January—fewer than 10,000 of them in the U.S. While deaths tend to lag infections by a couple weeks, Omicron has been dominant long enough that it’s increasingly evident there’s been what statisticians call a “decoupling” of cases and fatalities.

“We can say we dodged a bullet in that Omicron does not appear to cause as serious of a disease,” Stephanie James, the head of a COVID testing lab at Regis University in Colorado, told The Daily Beast. She stressed that data is still being gathered, so we can’t be certain yet that the apparent decoupling is real.

Assuming the decoupling is happening, experts attribute it to two factors. First, Omicron tends to infect the throat without necessarily descending to the lungs, where the potential for lasting or fatal damage is much, much higher. Second, by now, countries have administered nearly 9.3 billion doses of vaccine—enough for a majority of the world’s population to have received at least one dose.

Omicron Shows the Unvaccinated Will Never Be Safe

In the United States, 73 percent of people have gotten at least one dose. Sixty-two percent have gotten two doses of the best mRNA vaccines. A third have received a booster dose.

Yes, Omicron has some ability to evade antibodies, meaning the vaccines are somewhat less effective against this lineage than they are against Delta and other older lineages. But even when a vaccine doesn’t prevent an infection, it usually greatly reduces its severity.

For many vaccinated people who’ve caught Omicron, the resulting COVID infection is mild. “A common cold or some sniffles in a fully vaxxed and boosted healthy individual,” is how Eric Bortz, a University of Alaska-Anchorage virologist and public health expert, described it to The Daily Beast.

All that is to say, Omicron could have been a lot worse. Viruses evolve to survive. That can mean greater transmissibility, antibody-evasion or more serious infection. Omicron mutated for the former two. There’s a chance some future Sigma or Upsilon lineage could do all three.

When it comes to viral mutations, “extreme events can occur at a non-negligible rate, or probability, and can lead to large consequences,” Michael said. Imagine a lineage that’s as transmissible as Omicron but also attacks the lungs like Delta tends to do. Now imagine that this hypothetical lineage is even more adept than Omicron at evading the vaccines.

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That would be the nightmare lineage. And it’s entirely conceivable it’s in our future. There are enough vaccine holdouts, such as the roughly 50 million Americans who say they’ll never get jabbed, that the SARS-CoV-2 pathogen should have ample opportunities for mutation.

“As long as we have unvaccinated people in this country—and across the globe—there is the potential for new and possibly more concerning viral variants to arise,” Aimee Bernard, a University of Colorado immunologist, told The Daily Beast.

Worse, this ongoing viral evolution is happening against a backdrop of waning immunity. Antibodies, whether vaccine-induced or naturally occurring from past infection, fade over time. It’s not for no reason that health agencies in many countries urge booster doses just three months after initial vaccination. The U.S. Centers for Disease Control and Prevention is an outlier, and recommends people get boosted after five months.

A lineage much worse than Omicron could evolve at the same time that antibodies wane in billions of people all over the world. That’s why many experts believe the COVID vaccines will end up being annual or even semi-annual jabs. You’ll need a fourth jab, a fifth jab, a sixth jab, et cetera, forever.

Israel, a world leader in global health, is already turning that expectation into policy. Citing multiple studies that showed a big boost in antibodies with an additional dose of mRNA and no safety concerns, the country’s health ministry this week began offering a fourth dose to anyone over the age of 60, who tend to be more vulnerable to COVID than younger people.

That should be the standard everywhere, Ali Mokdad, a professor of health metrics sciences at the University of Washington Institute for Health, told The Daily Beast. “Scientifically, they’re right,” he said of the Israeli health officials.

If there’s a downside, it’s that there are still a few poorer countries—in Africa, mostly—where many people still struggle to get access to any vaccine, let alone boosters and fourth doses. If and when other richer countries follow Israel’s lead and begin offering additional jabs, there’s some risk of even greater inequity in global vaccine distribution.

“The downside is for the rest of the world,” Mokdad said. “I’m waiting to get my first dose and you guys are getting a fourth?”

The solution isn’t to deprive people of the doses they need to maintain their protection against future—and potentially more dangerous—lineages. The solution, for vaccine-producing countries, is to further boost production and double down on efforts to push vaccines out to the least privileged communities.

A sense of urgency is key. For all its rapid spread, Omicron has actually gone fairly easy on us. Sigma or Upsilon might not.