Leaky Vaccines, page-3

No different to the Flu vaccine...no vaccine had been found to be 100% effective, there are always cases of people contracting the disease after inoculation....often a different strain of the same virus.

It might well be that each of the various vaccines being marketed now will produce slightly different short and long term immunities. Where s person has been inoculated with a Pfizer vaccine, they may potentially be vulnerable to other strains of the virus that the Pfizer vaccine does not prevent replicating in their body.

Just as with the Flu vaccine there is a version known as the quadrivalent flu vaccine. The "quad" in the name refers to the four flu virus strains the vaccine is designed to control: two influenza A viruses, and two influenza B viruses.

Unless going forward they are able to mix the various vaccines together to produce a super vaccine that contains the properties each possesses I believe there will be continual break outs.