[GaryCrow]

Israel used mostly the Pfizer vaccine, Seychelles, Chile, UAE and Bahrain mostly used the Chinese one.

There's your difference.

[Treeless Branch]

That does NOT explain:

1. The CDC instructing the US states to not report to it breakthrough cases unless death or hospitalization.

2. The Feds instructing offices with entirely vaccinated workforces to wear masks.

3. 7 members of the Yankees having breakthrough cases.