Herd immunity alone may not protect you from COVID-19, say experts

More than 325,000 people, roughly three in 10 Nova Scotians, have received at least one dose of COVID-19 vaccine.

But two experts say that is not enough to have an effect on the spread of the virus across the province.

"We need to get up closer to 50 to 60 per cent before we can really see that," said Dr. Scott Halperin, the director of the Canadian Centre for Vaccinology in Halifax. "We're well on our way to that.

"Hopefully, we'll start seeing that effect soon."

Part of the problem, according to Halperin, is thatfew peoplewere infected during the first two waves of the pandemic. As a result, Nova Scotians have had to rely on vaccines for protection.

He saidhad the third wave arrived after more people had their jabs, we mighthave been spared community spread in the Halifax area.

"If that could have been held off for another three or four weeks we might have gotten to the point where we wouldn't have seen this surge," he said.

'The vaccine should do just fine'

This surge is being driven primarily bythe variant strainfirst detectedin the U.K., but Halperin saidthe three vaccines currently available in Nova Scotia offer enough protection against it.

"The vaccine should do just fine," saidHalperin. "What the future holds?That's what we don't know."

Halperin saidthe race is on to protect enough people before the virus mutates to the point where current vaccines provide so little protection that new vaccines have to be created to deal with the new strains.

Meanwhile, Dr. Rodney Russell,an immunology and virology professor at Memorial University ofNewfoundland, has a warning for those who think they don't need to be vaccinated because herd immunity will protect them against COVID-19.

"It's very, very important for people to realize that we may not be able to rely on herd immunity," he said. "If you want immunity, you have to get the vaccine yourself because I think the virus will find the unvaccinated people and keep spreading in them."

It's also unclear how many people will need to be vaccinated to createherd immunity or community protection, but Russell saidthe current thinking is that it will take at least 75 per cent of the population.

"Seventy-five per centshould give us enough immunity that we won't have massive outbreaks and explosions in cases like we see now in Halifax, like we saw in Newfoundland back in February," saidRussell.

"If three-quarters of the populationare vaccinated, then three out of four times that the virus tries to spreadit gets blocked," he said. "So then you won't have outbreaks and that means we can have a normal life."

Disagreement on vaccinating children

But the two experts disagree when it comes to the importance of vaccinatingchildren as part of the plan to protect all Nova Scotians.

Russell isn't concerned because children "for the most part ... haven't gotten that sick from this virus."

"Usually if your symptoms aren't too bad, you're not spreading too bad either," he said.

Halperin takes a different view, suggesting the province will need to vaccinateas many people as possible, regardless of their age.

"Until we get down into children, 25 or so per cent of our population is staying fully susceptible, and while they may not have the most severe disease they may provide a sufficient susceptible pool to keep the virus circulating," he said.

Halperinsaidif the Nova Scotia government is able to remain on track to immunize at least 75 per cent of its population by the end of June, Nova Scotians should see a return to more normal activities.

"I think the new normal will be towards the fall, mid-fall, maybe," he said. "I think we have to hang in there."

MORE TOP STORIES