“In 2017, one of the first birth cohorts of women in Denmark who were HPV-vaccinated as teenage girls in 2008 reached the screening age of 23 years,” Nonboe explained."
It will take several more years to see the effects on other strains. It seems to have been wildly successful so far.
Now they are.
Which means some new strain will become common. Is there any data on how quickly/easily new strains show up? I assume it's not as fast as cold/flu, but if it is people will need a vaccine yearly, and that's not realistic.
HPV is a double-stranded DNA virus with very high replication fidelity. The emergence of types like 16 and 18 happened hundreds of thousands of years ago.
I did know it was quite slow but not just how slow. Very long term vaccine efficacy is expected.
On top of being structurally a dsDNA virus which doesn't change much, HPV is subject to "purifying selection": because of the way it is built and the mechanism it uses to interact with host cells, it is very difficult for it to have productive mutations that don't immediately die out. It's highly constrained in a way that eg influenza, COVID, HIV, are not.
Some pathogens are just easier to deal with than others:
We have been curing syphilis since 1943 with just penicillin. It doesn't develop resistance because it doesn't have horizontal gene transfer and the mechanism it has that penicillin targets is too critical and conserved, it just can't mutate away from it.
Polio mutates quickly, but is extremely constrained, almost all mutations are defective, and the capsid structure is highly conserved. That vaccine has been in use since 1955 without losing effectiveness or introducing new variants.
The biology of HPV says it will be more like those cases, and since the introduction of the vaccine in 2006, that's what studies have been finding empirically.
To emphasize the difference in meaning of "strain" for HPV: There are 200+ HPV genotypes that have been numbered this way, but they are all of ancient origin. There are observed shifts in prevalence of different genotypes, but not newly evolved genotypes.
We also only care about targeting oncogenic strains. If we open up selective pressure for non-oncogenic strains to be more relatively successful and take over, great.
16/18 were chosen because they are highly carcinogenic and cause the most cancer, they are the two most aggressive high risk types. They cause 70% of all the cancer but are much less than 70% of the cases of high risk strains.
It takes real mental gymnastics to downplay how positive this vaccine is.
Yes
https://ourworldindata.org/hpv-vaccination-world-can-elimina...
And note that it's possible for a vaccine to have a negative survival benefit yet be a good idea--in a population with herd immunity a vaccine provides little benefit to those who receive it so long as enough people receive it to provide the herd immunity. But if too many don't get it the risk from not getting it goes up considerably. Look at what has been happening with measles--measles was basically unheard of, the quacks said not to vaccinate (remember, Wakefield was attacking a specific vaccine that he stood to profit from the controversy, Worm Brain doesn't believe in infectious disease in the first place), now we have people dying of measles.
this reads like a big grain of salt on the results.
from the paper, its more specific that girls who got the DTP vaccine and also not another vaccine afterwards have a higher mortality rate.
but also that its wildly different by location
Sure. This one hasn’t.
That said, I frankly think people should be free to vaccinate as they please, and cities, states and private businesses free to include and exclude folks based on vaccination status as they please. (I’m also in favor of letting insurance companies choose if they want to cover diseases someone chose to get by going unvaccinated.)
That is exactly why we need to apply the precautionary principle for new drugs like this one.
> That said, I frankly think people should be free to vaccinate as they please
Never said they shouldn't be. Just need to be skeptical of organizations like GAVI and their PR, as they have a huge conflict of interest in promoting and profiting from these drugs.
That would be democratic and efficient.
2. It needs to be confirmed in ~10 years, but it seems very likely that women given the shots that protect against all high risk HPV types will see almost no infections from them.