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I am not worried about shedding at all, I am worried about leakage.

Unfortunately it seems to be very much so.

Over the past fifty years, Marek’s disease, an illness of fowl—has become fouler. Marek’s is caused by a highly contagious virus, related to those that cause herpes in humans. It spreads through the dust of contaminated chicken coops, and caused both paralysis and cancer.

In the 1970s, new vaccines brought the disease the under control. But Marek’s didn’t go gently into that good night. Within ten years, it started evolving into more virulent strains, which now trigger more severe cancers and afflict chickens at earlier ages.

Andrew Read from Pennsylvania State University thinks that the vaccines were responsible.

The Marek’s vaccine is “imperfect” or “leaky.” That is, it protects chickens from developing disease, but doesn’t stop them from becoming infected or from spreading the virus.
Inadvertently, this made it easier for the most virulent strains to survive. Such strains would normally kill their hosts so quickly that they’d die out.
But in an immunised flock, they can persist because their lethal nature has been neutered. That’s not a problem for vaccinated individuals.
But unvaccinated birds are now in serious trouble.

This problem, where vaccination fosters the evolution of more virulent disease, does not apply to most human vaccines. Those against mumps, measles, rubella, and smallpox are “perfect:” They protect against disease and stop people from transmitting the respective viruses. “You don’t get onward evolution,” says Read. “These vaccines are very successful, highly effective, and very safe. They have been a tremendous success story and will continue to be so.”

We need to be very confident that the covid “vaccines” don’t leak. If they do, and vaccinated individuals are capable of passing it, that might lead to the evolution of very dangerous pathogens.”