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Countries groping for best coronavirus response: expert
PARIS, March 18, 2020 (BSS/AFP) – Sharon Lewin, director of The Peter
Doherty Institute for Infection and Immunity in Melbourne and a top expert on
infectious disease policy, spoke to AFP about the unfolding coronavirus
pandemic.
Countries that got caught off-guard or did not respond to the outbreak
decisively have paid a heavy price, she said. A few got ahead of the curve.
Q. What do we most urgently need to know about COVID-19?
What level of containment actually makes a difference to block
transmission, and when to escalate those interventions. That is still
unclear. Do you need to go Wuhan-style to completely stop it? Countries are
in different phases right now.
Another unanswered question is whether you have long-term immunity if you
are exposed.
Finally, what is the real mortality rate? There is a lot of confusion
around that.
Q. So what IS the mortality rate?
We think it is, overall, one to two percent as compared to the number of
infections. It goes up with age: over 80, up to 15 percent; 70-79, about six
percent; 60-69, about three percent. Under 60, much, much less. It also rises
with certain co-morbidities such as hypertension, cardiovascular disease,
diabetes.
But the mortality rate is also dependent on healthcare capabilities.
Wuhan — where the mortality rate was around eight to 10 percent — most
likely got hit harder because the virus overwhelmed the healthcare system.
They were totally unprepared.
Compare that with Chinese provinces outside of Wuhan (the capital of Hubei
province), where the mortality rate dropped to between one and two percent.
Same virus, same population, a similar age distribution. Conclusion? The
difference is related to the severity of the infection when you “present”, or
take action.
Outside of China, there was preparation, though in Italy the situation is
alarming — they are reporting mortality rates of about six percent across
the board. Italy also has a higher proportion of elderly people than China.
Q. If a country does everything right, how much will it help?
MORE/FI/ 1641 hrs
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We don’t have the data to answer that. We do know that the mortality is
different in different parts of the world, but it is very unlikely to be
because there are different strains of the virus. So the key factors appear
to be severity of illness and healthcare capability.
Italy is an example of the consequences of being very late in recognising
the problem. They reacted when they had deaths. When you are at that stage,
it means that you have had virus circulating for two or three weeks already.
I give full marks to Singapore and Hong Kong, which moved much earlier.
From a policy standpoint, that is much, much less acceptable to the public
because the threat is hardly visible. But once you have deaths, escalating
cases, and people can’t get into hospitals, the public cries out for
interventions.
South Korea has big numbers, but they were highly localised in two
communities. It is also significant that Hong Kong and Singapore had SARS,
and South Korea had MERS — they know how these things can spread like
wildfire.
Q. What is the difference in impact between lockdown and ‘softer’
restrictions, as in the US and Australia?
Lockdown works. As soon as Wuhan locked down, two weeks later — exactly
the incubation period of the virus — numbers of infections started to
decrease. But the question is whether you have to go that far.
In Singapore, they tested aggressively very early on and chased down cases
through contact tracing. But their social distancing measures were not that
extreme. They closed schools, but only for two or three weeks. Meetings were
banned but people still went to work.
Q. Will the virus bounce back in places where policy interventions have
worked?
In China, for example, I doubt that there’ss widespread immunity. You have
80,000 confirmed cases in a population of 1.5 billion. We need to know more
about how some people develop immune responses to the virus without any
symptoms.
Usually viruses burn out when they run out of people to infect. We talk
about “R-zero” — the number of people that each person with the virus
infects. The virus will only go away with the R0 is less than 1, which means
that not everyone in infecting someone else. Will it come back? We don’t
know. SARS didn’t.
Q. How would you grade China’s response, and the US?
China was extremely late, and there was obviously a lot of dysfunction in
December in January. But they were working with no information, and did a
spectacular job of shutdown later on.
The US is surprising. The US Centers for Disease Control (CDC) is like the
guru of all public health responses, and the US has done spectacular things
outside of the US with Ebola, SARS, etc. But in their own backyard, they have
nowhere near the success and leadership on coronavirus that the showed in
responding to disease in other places.
Q. Has the US response been undermined by Trump’s leadership?
Yes. They have some outstanding people in the CDC, and they should be
running the show.
BSS/AFP/FI/ 1642 hrs