The single dose of vaccine given to Quebec health-care workers and long-term care residents has been 80 per cent effective at stopping COVID-19 infections, the province’s immunization committee said Thursday.
While members of the committee said the results are preliminary, they recommended health officials give priority groups a single dose before anyone gets a second shot of the two-dose vaccine.
“We saw that in health-care workers and in residents of long-term care facilities, the vaccine gives a protection around 80 per cent in both groups,” Dr. Gaston De Serres, epidemiologist at Quebec’s government-mandated public health institute, told reporters.
That level of protection took two weeks to develop in health-care workers and three weeks to develop in long-term care residents, who generally have weaker immune systems, he added.
Around 80 per cent of long-term care residents and 50 per cent of public sector health-care workers have received a single dose of vaccine, De Serres said, adding that since early January, the number of COVID-19 cases in long-term care homes has dropped by around 95 per cent.
Quebec began its vaccination campaign in mid-December, focusing on long-term care residents and health-care workers. It has not yet begun giving people a second shot of the two-dose vaccines.
De Serres said the downward trend in cases is not entirely due to the vaccination campaign. The number of cases reported in private seniors residences _ where fewer people have been vaccinated _ has declined by 80 per cent over the same period.
On Thursday, Quebec reported 900 new cases of COVID-19 and 10 more deaths attributed to the novel coronavirus, including four within the preceding 24 hours. Five new cases were reported in long-term care homes, while 20 new cases were reported in private seniors residences.
Hospitalizations dropped by 19, to 747, and 129 people were in intensive care, a decrease of one. Officials said 2,234 doses of vaccine were administered Wednesday, for a total of 302,118.
Vaccine makers recommend the second shot be given within 21 or 28 days from the first one, depending on the vaccine. A federal committee has recommended a delay of up to 42 days. The Quebec government, however, says it wants to give the second shot within 90 days.
Dr. Nicholas Brousseau, chair of Quebec’s immunization committee, said that 90-day number comes from the provincial government, not the committee, which isn’t recommending a specific delay.
Brousseau said the committee is recommending Quebec give a single dose to all members of six priority groups before anyone receives a second shot. The priority groups include health-care workers, residents of long-term care and retirement homes, as well as people over 70 years old.
“That’s the way to decrease the number of hospitalizations and prevent deaths,” he said. “At the moment, we think that we have to favour a longer interval rather than a short interval to optimize the public health impact of the vaccine.”
Brousseau said that could change if there are signs the level of protection offered by the vaccine is declining.
Dr. Sophie Zhang, who oversees 15 long-term care centres in Montreal, said the steep decline of new COVID-19 infections in the long-term care homes may be an early sign Quebec’s vaccination strategy is working — but other factors are also likely contributing.
Zhang, who supports the province’s vaccine strategy, said “vaccination is part of the package” that has led to the decline in the number of new cases in long-term care.
“What we’re seeing is a combination of several things in synergy and really working together to decrease the cases and mortality,” she said in a recent interview. The lockdown and curfew, she added, have also contributed to the decline in the overall number of active infections in Quebec.
Joyce Shanks, a member of the Family Advocacy Committee at Maimonides, the long-term care centre where the first doses of vaccine were administered in Montreal, says she feels like the government is conducting an experiment on people who thought they would get two doses of vaccine within the time frame recommended by vaccine makers.
Her father, who lives at Maimonides, received one dose of vaccine more than 60 days ago but has not received the second. She worries the protection offered by a single dose won’t last.
“We’re holding our breath; we’re not breathing a sigh of relief,” she said Wednesday.View link »