A preliminary study found it is "significantly" less infectious than its predecessor.
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A new COVID-19 subvariant is dominant in Canada. Here’s why that might be a good thing
A preliminary study found it is “significantly” less infectious than its predecessor.
May 16, 2024
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This 2020 electron microscope image made available by the Centers for Disease Control and Prevention shows SARS-CoV-2 virus particles, which cause COVID-19.
Hannah A. Bullock, Azaibi Tamin

By
Ben CohenStaff Reporter
Last month, Japanese scientists whipped up a test tube version of the most concerning new COVID-19 mutation. They then sicced this “pseudovirus” on some cells, to see how it measured up to previous generations of COVID.
The results, while not yet peer-reviewed, are promising. This new kind of COVID, KP.2, a child of Omicron, is “significantly” less infectious than its predecessor, the scientists found.
This means KP.2 isn’t going to “blow up” and create a surge of cases like Omicron did, said Dr. Gerald Evans, chair of the division of infectious diseases at Queen’s University.
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KP.2 has since become a dominant strain in Canada. For this to have happened, it must have some advantage over JN.1, the older subvariant it’s set to displace.
KP.2’s talent, according to the study, is that it’s more resistant to ”neutralization.” That means it’s better at infecting people who have immunity, through vaccination or previous infection, than the last dominant strain was.
It’s not as bad as it sounds. Summer is coming, which is always associated with a lull in COVID cases, as people get outdoors where risk of infection is mitigated by fresh air. And come fall a
new, updated COVID vaccine will be available that should be more effective against KP.2.
CANADA
The National Advisory Committee on Immunization has released its recommendations for this fall,
Meanwhile, KP.2’s reduced infectivity will, Evans said, limit the total number of people who will get sick with the subvariant.
“On balance, it means you shouldn’t worry about it,” he said.
If you do get infected with KP.2, as far as medical experts know, you will experience the same symptoms you would if you had caught any other past COVID strain. Severity of illness is trending downward as the virus evolves and is further reduced if you have immunity from vaccination or infection.
As always, older and immunocompromised people are at the greatest risk. For them, Evans suggests semi-annual booster shots. If it’s been a while since your last shot, it might be best to get another one now, rather than wait for the updated vaccine, which should start being distributed in late September or early October.