Anonymous ID: 97cdc8 Sept. 10, 2021, 3:13 p.m. No.14554886   🗄️.is đź”—kun

“[T]hose who are willing to surrender their freedom for security have always demanded that if they give up their full freedom it should also be taken from those not prepared to do so.”

 

~ Friedrich August von Hayek

(1899-1992), Nobel Laureate of Economic Sciences 1974

The Road to Serfdom, p. 140-141 (1944)

Anonymous ID: 97cdc8 Sept. 10, 2021, 3:21 p.m. No.14554929   🗄️.is đź”—kun

>>14554892

This chicken vaccine makes its virus more dangerous

 

The deadliest strains of viruses often take care of themselves — they flare up and then die out. This is because they are so good at destroying cells and causing illness that they ultimately kill their host before they have time to spread.

But a chicken virus that represents one of the deadliest germs in history breaks from this conventional wisdom, thanks to an inadvertent effect from a vaccine. Chickens vaccinated against Marek’s disease rarely get sick. But the vaccine does not prevent them from spreading Marek’s to unvaccinated birds.

 

“With the hottest strains, every unvaccinated bird dies within 10 days. There is no human virus that is that hot. Ebola, for example, doesn’t kill everything in 10 days.”

In fact, rather than stop fowl from spreading the virus, the vaccine allows the disease to spread faster and longer than it normally would, a new study finds. The scientists now believe that this vaccine has helped this chicken virus become uniquely virulent.

This is the first time that this virus-boosting phenomenon, known as the imperfect vaccine hypothesis, has been observed experimentally.

 

The reason this is a problem for Marek’s disease is because the vaccine is “leaky.” A leaky vaccine is one that keeps a microbe from doing serious harm to its host, but doesn’t stop the disease from replicating and spreading to another individual. On the other hand, a “perfect” vaccine is one that sets up lifelong immunity that never wanes and blocks both infection and transmission.

It’s important to note childhood vaccines for polio, measles, mumps, rubella and smallpox aren’t leaky; they are considered “perfect” vaccines. As such, they are in no way in danger of falling prey to this phenomenon.

But the results do raise the questions for some human vaccines that are leaky – such as malaria, and other agricultural vaccines, such as the one being used against avian influenza, or bird flu.

 

“Our concern here, primarily and foremost, is whether this is going to happen with any of the vaccines that we give to people,” said molecular biology James Bull of the University of Texas Austin, who specializes in the evolution of viruses and bacteria. “But there is a lot we don’t know about how the scenario with Marek’s could apply to newer human vaccines.”

 

To test the imperfect vaccine hypothesis in humans, you would need monitor the vaccine response for either a large or isolated population for a long time. Doing this would allow a researcher to gauge how the vaccine interacts with the virus and if that relationship is evolving. Does the vaccine merely reduce symptoms, or does it also keep patients from getting infected and transmitting the virus?

 

https://www.pbs.org/newshour/science/tthis-chicken-vaccine-makes-virus-dangerous