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Medicine: How to Permanently End Diseases

Introversion

Pie aren't squared, pie are round!
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Smallpox was eradicated relatively quickly, but other diseases have proved harder to eliminate. The reasons are a mix of biology and psychology.

Quanta Magazine said:
The world officially became a slightly safer place in October, when the World Health Organization declared that polio’s type 3 strain had been eradicated. This strain — joining type 2, which was eradicated in 2015 — no longer exists anywhere in the world, outside of highly secure laboratories. (Type 1 is the only strain still at large.) Thanks to the hard work of thousands of dedicated individuals, these two strains will no longer cause devastating paralysis or death.

While it was once just a dream, permanently ending diseases has been within our power since 1980, when smallpox was eradicated after an intense campaign. This victory has saved roughly 200 million people who would otherwise have succumbed to the disease since then.

But other attempts to rid the world of diseases have not gone as smoothly. Doctors have been working on ending polio for 31 years, initially hoping it would be completely gone by 2000. Now, due to difficulties tracking the disease, the target eradication date for the remaining type 1 strain is 2023. Another pathogen nearing eradication is a parasite known as Guinea worm, but again, problems have complicated that campaign, and others as well.

So what was it about smallpox that made it so much simpler to eradicate? What makes an organism eradicable in the first place?

Fundamentally, if we want to get rid of a pathogen, we must have a way of stopping its transmission. Halt the spread, and you can isolate those infected without anyone else getting sick. Do a thorough enough job, and there won’t be any new cases anywhere in the world — the disease is eradicated. Theoretically, this process can take many forms. The deployment of an effective vaccine robs a disease of future hosts. Eliminating a key vector takes out the means of infection. And for a bacterial pathogen, antibiotic treatments can target the disease itself. But theory doesn’t always translate to practice in the real world.

For a sense of what actually works, smallpox provides the perfect case study: It turns out to be almost ideally suited to eradication. First, it’s a virus that only affects people, not animals. Wipe it out in humans, and that’s it, you’re done. (We’re not actually sure why smallpox is so choosy, and we’re unlikely to find out anytime soon, since little research today involves the deadly pathogen — and even then, it focuses on treatments and vaccine research over fundamental biology.)

Second, the disease makes its presence clearly and unambiguously known. It produces a rash that’s easy to identify and distinct from rashes caused by other diseases. And infections are not asymptomatic: You can’t be infected and contagious but still appear healthy. (Again, it’s not clear why this is.) These traits make it easier to track new cases and quickly stop outbreaks.

Third, smallpox has a highly effective vaccine, made from a virus closely related to smallpox called the vaccinia virus. Because the vaccine contains a live virus, the immune system produces a rapid, strong and lasting response. The vaccine can even stop a smallpox infection in its tracks. “You can vaccinate somebody who is already developing smallpox up to six days after they have been infected,” said Larry Brilliant, an epidemiologist and former WHO physician who took part in the smallpox eradication campaign. The vaccine made it easier to halt new transmissions and protect healthy people, even if responders arrived at a smallpox outbreak that was already underway.

The fourth reason — and an increasingly relevant one — is not a biological consideration, but a psychological one: Smallpox was a feared disease. People knew it was deadly, and even survivors could be scarred for life. This translated to political support from world governments and local support among populations receiving the vaccination.

All these features in combination enabled us to wipe out one of humanity’s oldest scourges in about a dozen years of intense effort. But if a disease is missing just one or two of these attributes, it can prove much harder to eradicate.

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MaeZe

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Smallpox doesn't have an animal reservoir. It was also possible to spot mild cases which is critical in eliminating an infectious disease.

We (as in the scientific community) did an excellent job eliminating SARS. There was incredible fear of SARS.

But I find the author's conclusion that the reason was
a psychological one: Smallpox was a feared disease. People knew it was deadly, and even survivors could be scarred for life. This translated to political support from world governments and local support among populations receiving the vaccination.
That is incredibly over-simplistic.

Don't get me started, I have pages of stories about stopping the SARS pandemic. :D

I will say a couple things though.

The fact SARS infected healthcare workers was a huge reason the effort was made in the Western world to stop it in it's tracks. It matters who is at risk. Ebola is equally able to infect healthcare workers and we saw the reaction when a couple cases made it through to the US and the UK. But notice the world is not acting to stop ebola in the countries/populations it is currently affecting.

Another example of ridiculous oversimplification by the author is not to have mentioned why we won't be able to eliminate influenza anytime soon. But I admit I didn't look to see if it was mentioned in the link.


Doesn't mean I don't love your links, Intro. :D
 
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