Herd Immunity Not a Proven Way to Reopen Society WHO Says
The World Health Organization (WHO) published a
brief on April 24 which says that there is "currently no evidence" that
people who have recovered from COVID-19 and have antibodies would be
protected from a second infection. They would nonetheless, end up with
"some level of protection," the WHO subsequently clarified.
WHO cautioned in its brief that due to a lack of
evidence, doling out "immunity passes" based on recovery from the virus
could lead to people ignoring public health advice when they could
still get re-infected and continue the chain of transmission.
Having a large portion of a population with
antibodies
that make them immune to another infection from the same virus is known
as "herd immunity," because those who have yet to be infected and lack
the antibodies are conferred some level of protection because the virus
cannot take hold in the population as a whole. Herd immunity is being
floated in Canada and elsewhere as regions and countries seek to end
lockdowns and social distancing measures.
For example, Quebec Premier François
Legault
stated in an April 23 press conference announcing plans to restart the
economy, "The idea is to gradually -- and that's the important word --
to gradually let people go out, let children go out." Those under 60
years of age might be candidates for developing immunity, he suggested.
Canada's Chief Public Health Officer Dr. Theresa
Tam,
during a press conference on April 25, said that there is insufficient
evidence to back herd immunity as a way to reopen society, as Quebec's
Premier suggested.
"The idea of [...] generating natural immunity is
actually not something that should be undertaken," Dr. Tam said. She
called on people to be "extremely cautious" about the concept. She said
that even a young person might become severely sick and end up in the
ICU, "so it's not a concept that should be supported."
Canada's official position is that until a vaccine
is developed against the COVID-19 virus, the population will not be
safe from infection.
In response to the demands of premiers for the
economy to be opened after a one-month shutdown, Canada's first
ministers, including the Prime Minister, on April 24 agreed to work on
a joint set of national guidelines that would lay out how to carry out
the process. Trudeau said at his press briefing on April 25 that those
plans do not rely on using immunity as an interim form of protection.
"In the approach that we're taking very carefully
around the provinces and across the country on looking at reopening, I
don't believe that there are any plans that hinge on certain people or
individuals being immune or having immunity to COVID-19," Trudeau said.
Some countries, such as Chile, are moving to issue
"immunity passports" to those who have recovered from the virus, media
reports inform. The passes would be issued to gradually exempt people
from restrictions put in place to limit the spread of COVID-19,
permitting them to return to work, attend mass gatherings or even
travel across borders.
Dr. Tam said that without a clear understanding of
immunity tests for COVID-19, it's too early to think about issuing
passes for those who might be protected.
This article was published in
![](http://cpcml.ca/Tmlw2019/Articles/Logo-TMLWeeklyIP-Small.jpg)
Volume 50 Number 14 - April 25, 2020
Article Link:
Herd Immunity Not a Proven Way to Reopen Society WHO Says
Website: www.cpcml.ca
Email: editor@cpcml.ca
|