Should vaccinated persons be able to travel free of charge?

Gary Leff at 14. February 2021.

Some countries are considering opening their borders to vaccinated tourists. Thailand considered it, but this week the CDC ruled against it. Australia states that access will be limited to one place when the borders reopen.

We are constantly told that vaccines protect those who are vaccinated, but not those around you – you can still contract and spread the virus without symptoms. That’s true, but it’s misleading.

  • Vaccines not only reduce symptomatic infection, but also asymptomatic infection (at least this has been shown for some).
  • And asymptomatic infection is less likely in people who have been vaccinated (at least with some vaccines).
  • People who have symptoms are less likely to spread the virus than those with symptoms.

A distinction is often made between pre-symptomatic spread (people who spread the virus before symptoms appear) and asymptomatic spread (spread of the virus by a person who never shows symptoms). The former is one of the hallmarks of a pandemic, while the latter is much less common.

We know roughly how protective individual vaccines are. Moderna and Pfizer vaccines have been shown to be approximately 95% effective in preventing symptoms of covariectomy. But that’s not the most important thing. Pfizer and Modera’s vaccines are nearly 100% effective against severe forms of covids. AstraZeneca’s vaccine has been shown to be 100% effective against hospitalization.

The question is to what extent vaccination reduces transmission. We know it is. This has even been demonstrated in the data from Modern and Pfizer’s phase 3 studies. The amount of the reduction is the subject of some controversy. And just so we’re clear: No one believes that these vaccines do not reduce transmission. They probably reduce the transmission a lot.

If there is an example of a vaccine that is widely used clinically that has this selective effect – preventing disease but not infection – I don’t see one! Dr. Paul Sachs of Harvard wrote in the New England Journal of Medicine. (And, no, exclamation points are not common in medical journals).

An Israeli study examined 102 vaccinated patients and found that people who received both doses of the vaccine did not become carriers or spread the virus further.

Israel is the most vaccinated country in the world, and its health system keeps reliable records. This makes their real-time vaccination efforts fertile ground for understanding the effects of Pfizer-BioNTech’s widely used vaccine.

A new study shows that the transmission of decreases even after the first dose of. Those who test positive for Covid-19 12 or more days after their first dose have a viral load four times lower than those who have not been vaccinated at all.

Vaccinated people are much less likely to transmit IDVOC before receiving a second dose, a groundbreaking new Israeli study concludes.

…Virus load has been shown to decrease by an average factor of four for infections occurring 12 to 28 days after the first dose of Pfizer-BioNTech vaccine.

… It’s a game changer, he says. Finally, post-vaccine transmissibility was one of the most important questions we asked.

…Cohen, a professor at Bar Ilan University and a member of the Health Ministry’s advisory committee on the coronavirus vaccine, said This shows that the vaccine not only reduces symptoms and hopefully mortality, but can also help achieve a kind of herd immunity that provides partial protection to people who are weak or unresponsive.

We don’t yet know how much the material will be reduced by, especially if a second shot is added. Based on new data, we know that vaccination with at least some Covid 19 vaccines reduces transmission. We will soon see whether they limit transmission enough to allow those who are vaccinated to travel more freely.

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