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  • Walter's Blog.
  • Home
  • Introduction
  • About Walter
    • 1980 Joining Up - Grafton Street >
      • Arrival and First Impressions
      • First Week
      • Training
      • Passing Out
    • Yaumati Cowboy >
      • Getting on the Streets
      • Tempo of the City
      • Jumpers, pill poppers and the indoor BBQ
      • Into a Minefield.
    • Why Tango in Paris, when you can Foxtrot in Kowloon? >
      • Baptism By Fire
      • Kai Tak with Mrs Thatcher.
      • Home; The Boy Returns
  • 1984 - 1986
    • PTU Instructor & Getting Hitched
    • Having a go: SDU
    • Starting a Chernobyl family
    • EOD - Don't touch anything
    • Semen Stains and the rules
  • 1987 to 1992 - Should I Stay or Go?
    • Blue Lights, Sirens & Grenades
    • Drugs, Broken Kids & A Plane Crash
    • 600 Happy Meals Please!
    • Hong Kong's Best Insurance
    • Riding the Iron Horse
  • Crime in Hong Kong
    • Falling Crime Rates - Why?
    • Triads
  • History of Hong Kong Policing
    • History 1841 to 1941
    • History 1945 to 1967
    • Anatomy of the 50 cent Riot - 1966
    • The Fall of a Commissioner.
    • History 1967 to 1980
    • Three Wise Men from the West
    • The Blue Berets.
    • The African Korps and other tribes.
    • Getting About - Transport.
    • A Pub in every station
    • Bullshit Bingo & Meetings
    • Godber - The one who nearly got away.
    • Uncle Ho
  • Top 20 Films
    • 2001 - A Space Odyssey.
    • The Godfather.
    • Blade Runner
    • Kes
    • Star Wars
    • Aliens
    • Ferris Bueller's Day Off
    • The Life of Brian
    • Dr Strangelove.
    • Infernal Affairs
    • Bridge on the River Kwai.
    • This Is Spinal Tap.
    • Chung King Express
    • An Officer and a Gentleman
    • PTU
    • Contact
    • Saving Private Ryan
    • Family Guy Star Wars
    • Zulu
    • Hard Day's Night
  • The Long Read
    • How The Walls Come Down
    • War in Ukraine - the narrative and other stuff.
    • The Hidden Leader
    • The Big Game
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Walter's Blog

"But how can you live and have no story to tell?" Fyodor Dostoevsky
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Reflections on recent events, plus the occasional fact free rant unfiltered by rational argument. 

"If you want to read a blog to get a sense of what is going on in Hong Kong these days or a blog that would tell you wh at life was like living in colonial Hong Kong, this blog, WALTER'S BLOG, fits the bill."  Hong Kong Blog Review

20/2/2021 0 Comments

Happy Anniversary Covid-19

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"Do lockdowns cause more virulent and lethal strains of Covid-19 to emerge?"
A couple of weeks back, we reached the anniversary of Covid-19. While we remember the victims, let's celebrate. Over the past 12 months, we've learnt a great deal with the advances made on vaccines, nothing short of remarkable. These innovations place us in a strong position when the next pandemic arrives. But there is much we have yet to understand.

For example, do lockdowns cause more virulent and lethal strains of Covid-19 to emerge? While this may appear an odd question, understanding how evolution works means further examination is needed. Undoubtedly lockdowns curb the spread of all variants you assert. That's not the case. It helps to consider human behaviour as a factor. Dr Paul Ewald, an evolutionary biologist from Massachusetts, believes the lethal strains enjoy a boon due to our actions. Let me try to explain. 

We know that the RNA in a virus undergoes constant random mutations. There is no plan at work here, only haphazard processes. What is essential to note is that specific mutations gain an advantage because the environment favours their spread. After all, the virus seeks to do one thing, move from host to host. 

Thus, virulent strains that kill the host quick are unlikely to move into the broader population because the transmission chain is cut. To illustrate the point, Ebola doesn't enjoy much contagion because it rapidly turns the victim's insides to a mush. The game is up before the virus can reach lots of people.

During the 1918 flu outbreak, the initial virus was relatively weak and mild in symptoms. Thus soldiers who caught the flu remained on post in the trenches. This gentle form spread without any significant impact. 

Then came a second wave with a mutated virus that proved more severe in symptoms and was lethal for many. In particular, this strain hit people of fighting age hard. In response, the military removed the infected from the front-line through clearing stations and into hospitals at the rear. This process gave the virulent strain an advantage that allowed it to move into a much larger population. 
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As the more virulent strain kept people immobile, unable to care for themselves, others attended them. Stretcher-bearers, orderlies, nurses and doctors all came into contact with the carriers. We thereby provided a route for transmission. 

With Covid-19, we've seen some correlation between places that implemented strict lockdowns and the emergence of potent variants. For instance, the United Kingdom. Whereas places like India and Hong Kong have had no virulent strains appear.  Only the milder forms of Covid-19 dominated, even though both India and Hong Kong are crowded.

The hypothesis is that by locking down a population, you keep people static in one place, and thus the mild variants cannot move around. In that sense, you achieve your aim. But, when a new, more potent strain emerges, you transport the sick to a hospital and into care. That movement provides the opportunity for the virulent strain to pass into the wider community. Our response gives the nasty mutation an advantage.

It's important to stress that this is a theory. We need a study, using statistical models allied to the tracing of individual strains to verify the idea. Also, it is not that we dismiss the merits of lockdowns. Please don't lose sight of how we are dealing with a complex dynamic system of virus transmission. Lockdowns will keep a role, even if the theory proves correct. Still, we may adjust these to minimise the leg-up we give virulent strains and reduce community-wide deaths. 

The obvious conclusion is that there is much to learn and celebrate. 
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    Walter De Havilland was one of the last of the colonial coppers. He served 35 years in the Royal Hong Kong Police and Hong Kong Police Force. He's long retired. 

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