The virus is still kind of in control of what's going on
Omicron's extreme contagiousness provides more infection opportunities for viral mutation, potentially spawning unpredictable variants with unknown severity. Viruses don't necessarily evolve toward mildness; double infections could create hybrid variants, and animal reservoirs pose additional mutation risks.
- Omicron is at least twice as contagious as Delta, four times as contagious as the original virus
- WHO recorded 15 million new COVID cases in the week of January 3-9, a 55% increase from the previous week
- Dozens of countries have vaccinated less than 25% of their populations; WHO director-general seeks 70% global vaccination by mid-year
Experts caution that Omicron's rapid spread creates ideal conditions for new coronavirus mutations, with no guarantee future variants will be milder or vaccine-resistant.
The world has learned to read Greek letters. Delta. Omicron. And now scientists are warning that the alphabet is far from finished—that Omicron's explosive spread across the globe practically guarantees more variants will follow, each one a mystery until it arrives.
The math is simple and relentless. Every infection is an opportunity for the virus to change. Omicron has an advantage its predecessors lacked: it spreads with stunning speed even as much of the world has built up some immunity through vaccination or prior illness. That means more people, more infections, more chances for the virus to evolve into something new. In the week of January 3-9, the World Health Organization recorded 15 million new COVID cases—a 55 percent jump from the week before. Each of those infections is a roll of the dice.
What comes next remains unknowable. Omicron appears to cause less severe disease than Delta, and that has kindled a quiet hope: perhaps the virus is trending toward mildness, the way a pathogen might eventually settle into something like the common cold. But experts are careful not to mistake hope for certainty. Viruses don't always become less dangerous over time. A variant could spread efficiently while causing mild initial symptoms, only to turn severe later, after the infected person has already passed it on. There is no biological law pushing the virus toward gentleness. "There's no particular reason for it to do so," said Stuart Campbell Ray, an infectious disease expert at Johns Hopkins University. "I don't think we can be confident that the virus will become less lethal over time."
The pathways for evolution are numerous and unsettling. Animals—pet dogs and cats, deer, farm-raised mink—can harbor the virus and potentially incubate new variants that leap back to humans. With both Omicron and Delta still circulating, people could contract both simultaneously, creating what Ray calls "Frankenvariants," hybrids combining traits of each. The IHU variant, identified in France and carrying 46 mutations in its spike protein, shows that sheer genetic complexity doesn't predict spread; it has barely moved despite its dramatic mutations. Omicron itself has around 30 mutations in the spike protein and has raced across the world like fire through dry grass—at least twice as contagious as Delta, at least four times as contagious as the original virus.
The speed of Omicron's spread creates particular danger for people with weakened immune systems. When the virus lingers inside them for weeks or months, it has time to mutate, to develop potent new forms. "It's the longer, persistent infections that seem to be the most likely breeding grounds for new variants," Ray said. The virus doesn't need to kill quickly to succeed; it only needs to replicate. And Omicron is masterful at that, reinfecting people who have already had COVID and breaking through the defenses of the vaccinated while continuing to ravage the unvaccinated.
The solution, experts say, is vaccination—now, while today's shots still work. Vaccines remain protective, and boosters dramatically reduce serious illness, hospitalization, and death. But vaccination rates tell a story of global failure. The WHO's director-general, Tedros Adhanom Ghebreyesus, has called for 70 percent of people in every country to be fully vaccinated by mid-year. That target remains distant. Dozens of countries have vaccinated less than a quarter of their populations. In the United States, resistance to available vaccines persists. "These huge unvaccinated swaths in the U.S., Africa, Asia, Latin America and elsewhere are basically variant factories," said Prabhat Jha of the Centre for Global Health Research at St. Michael's Hospital in Toronto. "It's been a colossal failure in global leadership that we have not been able to do this."
Anne Thomas, a 64-year-old IT analyst in Rhode Island, is fully vaccinated and boosted. She stays mostly home in a state with one of the highest COVID case rates in the country. "I have no doubt at all that these viruses are going to continue to mutate and we're going to be dealing with this for a very long time," she said. The virus, experts agree, will not settle into the predictable rhythm of endemic disease—like the flu—as long as vaccination rates remain so low. With so many unvaccinated people worldwide, the virus remains in control. New variants are not a possibility. They are inevitable.
Notable Quotes
There's no particular reason for it to do so. I don't think we can be confident that the virus will become less lethal over time.— Stuart Campbell Ray, infectious disease expert at Johns Hopkins University
These huge unvaccinated swaths in the U.S., Africa, Asia, Latin America and elsewhere are basically variant factories. It's been a colossal failure in global leadership that we have not been able to do this.— Prabhat Jha, Centre for Global Health Research at St. Michael's Hospital in Toronto
The Hearth Conversation Another angle on the story
Why should we believe another variant is coming? Omicron is already everywhere.
Because Omicron is everywhere. Every infection is a chance for the virus to mutate. Fifteen million cases in a single week means fifteen million opportunities for change. The virus doesn't need to plan ahead—it just needs to keep spreading.
But Omicron seems milder than Delta. Shouldn't that trend continue?
That's the hope many people hold onto. But there's no biological reason viruses must become gentler. A variant could spread easily while causing mild symptoms at first, then turn severe later. By then, it's already moved to the next person. Evolution doesn't have a direction—it just has pressure.
What makes Omicron so good at spreading compared to earlier versions?
It's at least twice as contagious as Delta, four times as contagious as the original. It reinfects people who've already had COVID. It breaks through vaccination. And it's doing all this on a planet where immunity is patchy—some people vaccinated, some not, some with prior infection. It's found every gap.
You mentioned animals could create new variants. How does that work?
The virus can live in dogs, cats, deer, mink. If it mutates inside an animal and jumps back to humans, we have a variant that emerged outside our immune system's reach. We wouldn't have built any defenses against it.
What about the IHU variant with 46 mutations? That sounds dangerous.
It sounds like it should be, but it hasn't spread. Omicron has fewer mutations and conquered the world. We can't predict from genetics alone which variants will take off. The virus's success depends on transmission, not complexity.
So vaccination is the answer?
It's the armor we have. Vaccines still protect, boosters reduce severe illness and death. But only if enough people use them. When vaccination rates are low, you create space for the virus to keep circulating, keep mutating. The unvaccinated populations are essentially variant factories.
How long does this continue?
Until vaccination reaches the scale needed to slow transmission globally. The virus won't become predictable like the flu as long as huge portions of the world remain unvaccinated. We're not waiting for the next variant—we're waiting to see if we can vaccinate fast enough to stop creating them.