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Este blog trata basicamente de ideias, se possível inteligentes, para pessoas inteligentes. Ele também se ocupa de ideias aplicadas à política, em especial à política econômica. Ele constitui uma tentativa de manter um pensamento crítico e independente sobre livros, sobre questões culturais em geral, focando numa discussão bem informada sobre temas de relações internacionais e de política externa do Brasil. Para meus livros e ensaios ver o website: www.pralmeida.org. Para a maior parte de meus textos, ver minha página na plataforma Academia.edu, link: https://itamaraty.academia.edu/PauloRobertodeAlmeida.

Mostrando postagens com marcador John M. Barry. Mostrar todas as postagens
Mostrando postagens com marcador John M. Barry. Mostrar todas as postagens

sexta-feira, 12 de março de 2021

Abandoning masks now is a terrible idea. The 1918 pandemic shows why - John M. Barry (WP)

Opinion:  

Abandoning masks now is a terrible idea. The 1918 pandemic shows why

 https://www.washingtonpost.com/opinions/keep-your-mask-on-were-not-out-of-this-yet/2021/03/11/a4dae20e-827f-11eb-9ca6-54e187ee4939_story.html?utm_campaign=wp_opinions_pm&utm_medium=email&utm_source=newsletter&wpisrc=nl_popns

Opinion by John M. Barry

The Washington Post, March 12, 2021 at 10:00 a.m. GMT-3

John M. Barry is the author of “The Great Influenza: The Story of the Deadliest Pandemic in History” and distinguished scholar at the Tulane University School of Public Health and Tropical Medicine.

Abandoning masks and social distancing now would be the worst possible move for Americans and their political leaders. The 1918 pandemic teaches us why.

That pandemic came in waves that were much more distinct than what we have experienced. The first wave was extraordinarily mild. The French Army suffered 40,000 hospitalizations but only about 100 deaths. The British Grand Fleet had 10,313 sailors fall ill — but only four deaths. Troops called it “three-day fever.” It was equally mild among civilians and was not nearly as transmissible as influenza normally is.

Like SARS-CoV-2, the 1918 influenza virus jumped species from an animal to humans. As it infected more humans, it mutated. It became much more transmissible, sweeping across continents and oceans and penetrating everywhere. And as it became more transmissible, it caused a much, much more lethal second wave. It became the worst version of itself.

In that second wave, the 1918 virus had an overall case mortality in the West of 2.0 to 2.5 percent, but that average is meaningless because it primarily killed select age groups: children under 10 and adults 20 to 50. Metropolitan Life found that, of those aged 25 to 45, it killed 3.26 percent of all factory workers and 6.21 percent of all miners; and yet it barely touched the elderly.

U.S. Army training camps routinely recorded case mortality over 10 percent; at Camp Sherman in Ohio, case mortality exceeded 21 percent. In 13 studies of hospitalized pregnant women, the death rate ranged from 23 to 71 percent. In a few isolated small settlements in Alaska and Africa, it killed everyone.

Virologists expected SARS-CoV-2 to mutate more slowly than influenza, and between its emergence and November 2020, the virus did seem remarkably stable.

That’s why last year, when I was repeatedly asked whether I worried that SARS-CoV-2 would, like the 1918 virus, become more lethal, I always replied that, even during 1918’s mild first wave, that virus had on rare, isolated occasions demonstrated its potential to kill in, according to an Army report, “from 24 to 48 hours.” Since the SARS CoV-2 virus had not shown any indication — none — of increased lethality, I was not concerned.

But in the past several months, different variants have surfaced almost simultaneously in Britain, South Africa, Brazil, and now in California and New York. Each of these variants has independently developed similar and in some cases identical mutations and achieved greater transmissibility by binding more efficiently to human cells.

A virus that binds more efficiently to cells it infects would, logic suggests, also be more likely to bind to a larger number of cells, which could, in turn, increase disease severity and lethality. On Wednesday, BMJ, formerly the British Medical Journal, reported that Britain’s so-called U.K. variant was 64 percent more lethal than the virus it replaced.

There is not enough data to evaluate the variants first identified in South Africa and Brazil, but whether or not they are also more lethal, one thing is certain — more variants will arise. Mutations are random. Most either make the virus so defective it can’t function or have no impact at all. But this virus has already demonstrated that it can become more deadly and evade some immune protection, making vaccines less effective. If we allow the virus additional opportunities to mutate, it will have more opportunities to become the worst version of itself.

There is no reason to expect that this virus will suddenly turn into 1918. There are limits as to how far it can mutate. But the more people who abandon masks and social distancing, the more infections can be expected — and the more variants will emerge.

In gambling terms: If you roll the dice once, yes, there is only a 2.77 percent chance you will hit snake eyes. But if you roll the dice 100,000 times, it is virtually certain snake eyes will come up several thousand times.

Right now, policymakers are making decisions that will limit — or expand — opportunities for the virus to spread and mutate. Most proposals will require weighing costs, benefits and risks, such as when and how much to reopen the economy or delaying second doses of vaccines.

Wearing masks requires none of these calculations.

We know masks decrease transmission. Lifting a masking order not only means more people will get sick and die. It also gives the virus more rolls of the dice. That is a fact.

The variants we have seen so far do not worry me much. The variants we have not yet seen . . . yes, they worry me. To increase our risks is, simply, foolish.


Read more:

 

quinta-feira, 19 de março de 2020

Antes do "virus chinês", teve o "virus americano", equivocadamente chamado de "gripe espanhola"

Sobre o virus "chinês", cabe lembrar que ele tem um precedente, o virus "americano", vulgarmente chamado de "gripe espanhola".

Paulo Roberto de Almeida

Aos que se apressam a condenar a "ditadura chinesa" como responsável pelo "genocídio" do Covid-19, não custa lembrar que, até o momento, esse novo Coronavirus matou, por enquanto, menos de dez mil pessoas, e já se encontra relativamente bem controlado lá onde começou, no interior da China, e também nos países adjacentes (Coreia, Hong Kong, Cingapura). Se ele hoje apresenta uma taxa de letalidade muito maior na Itália, e se espalha por outros países, a culpa não é da China, em qualquer momento, pois epidemias se disseminam por pessoas que circulam pelo mundo, QUALQUER QUE FOSSE o regime político chinês, digamos a mais perfeita democracia.


Estou lendo agora o livro de John M. Barry, The Great Influenza: the Story of the Deadliest Pandemic in History (Penguin Books, Kindle, 2018; ISBN: 978-1-1012-009-71), que relata muito claramente a origem desse "VIRUS AMERICANO":

"In 1918 an influenza virus emerged – probably in the United States – that would spread around the world, and one of its earliest appearances in lethal form came in Philadelphia. Before that worldwide pandemic faded away in 1920, it would kill more people than any other outbreak of disease in human history. Plague [Peste Negra] in the 1300s killed a far larger proportion of the population – more than one-quarter of Europe – but in raw numbers influenza killed more than the plague then... (loc. 188)
The lowest estimate of the pandemic's worldwide death toll is twenty-one million, in a world with a population less than one-third today's. (...) Epidemiologists today estimate that influenza likely caused at least fifty million deaths worldwide, and possibly as many as one hundred million." (loc 188)

Ou seja, em lugar de ser chamado de "gripe espanhola", esse virus deveria ser chamado de VIRUS AMERICANO (ou estadounidense, como diriam os petistas). O pior é que essa "gripe" matava sobretudo jovens, entre 20 e 30 anos, e até crianças, e afetou pessoas que nunca se recuperaram.
O virus veio, provavelmente, da Filadelfia, e não me lembro que alguém tenha acusado os americanos de serem genocidas, independentemente do seu regime político.