Canadian Prime Minister Justin Trudeau that he would remain in self-imposed isolation even though his wife, who had contracted the coronavirus, has recovered.
Although Sophie Gregoire Trudeau received the all-clear from her physicians on Saturday, the prime minister said, and he himself has no symptoms, he had been "sharing a roof with someone who tested positive for COVID-19."
"I have to continue in isolation in order to be sure that we're following all the protocols and the recommendations by Health Canada," Trudeau said.
Since doctors did not know exactly when Sophie Trudeau became virus-free, the prime minister said he would observe another 14 full days of confinement.
Addressing reporters from the porch of his Rideau Cottage residence in Ottawa, Trudeau noted that workers across Canada had discovered that they can do an "awful lot of work via telephone, via video conferences -- and that's exactly what I am doing."
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A vaccine works by mimicking a natural infection. A vaccine not only induces immune response to protect people from any future COVID-19 infection, but also helps quickly build herd immunity to put an end to the pandemic. Herd immunity occurs when a sufficient percentage of a population becomes immune to a disease, making the spread of disease from person to person unlikely. The good news is that SARS-CoV-2 virus has been fairly stable, which increases the viability of a vaccine.
There are broadly four types of vaccine — one, a vaccine based on the whole virus (this could be either inactivated, or an attenuated [weakened] virus vaccine); two, a non-replicating viral vector vaccine that uses a benign virus as vector that carries the antigen of SARS-CoV; three, nucleic-acid vaccines that have genetic material like DNA and RNA of antigens like spike protein given to a person, helping human cells decode genetic material and produce the vaccine; and four, protein subunit vaccine wherein the recombinant proteins of SARS-COV-2 along with an adjuvant (booster) is given as a vaccine.
Vaccine development is a long, complex process. Unlike drugs that are given to people with a diseased, vaccines are given to healthy people and also vulnerable sections such as children, pregnant women and the elderly. So rigorous tests are compulsory. History says that the fastest time it took to develop a vaccine is five years, but it usually takes double or sometimes triple that time.
The prime minister has been in self-isolation since his wife tested positive for the coronavirus on March 12 following a trip to London.
She announced Saturday that her physicians had pronounced her cured, giving her a green light to return to normal life.
Justin Trudeau said his wife had taken their children to Harrington Lake, just northwest of Ottawa, the site of a summer residence and official retreat for Canadian prime ministers.
Trudeau also announced new financial measures to help vulnerable Canadians -- particularly children and the aged -- hard hit by the side-effects of the coronavirus.
Asked at the news conference whether he might call on Canada's armed forces to help enforce officially imposed travel curbs, Trudeau said he had no plans to do so for now.
Separately, Dr. Theresa Tam, Canada's chief public health officer, called on Canadians returning to their country to strictly respect the 14 days of confinement imposed by the government.
She referred in particular to "snowbirds" -- the Canadians who pass much of the winter in Florida and other warmer locales, many of whom have recently been returning home.As of Sunday, 6,243 Canadians had tested positive for the coronavirus, and 64 have died, according to a tally from Johns Hopkins University.