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Dear Steve.

I don't know if they're being ironic when they say "spectacular results" from the article. Let me know if your paragraph in the Nature link exactly above the material and methods corresponds to what I copied below. I say this because I have evidence that Google translators change the sentence in such a way as to invert the meaning of the result. This may also be happening in the results of the article that arrive in Brazil, even before translating.

"In summary, we provide evidence that anti-Spike SIgA are induced and maintained in the saliva of approximately 30% of mRNA vaccinated participants and that high anti-Spike/RBD serum IgA levels are associated with protection against subsequent breakthrough infection. Intranasal (i.n.) adenoviral-based vaccines that robustly induce anti-Spike/RBD IgA have been shown to prevent transmission in golden hamsters23. Moreover, a SARS-CoV-2 mRNA vaccine i.m. prime followed by an adenoviral i.n. boost provides superior protection against infection compared to i.m. only regimes, even against divergent variants such as B.1.1.351 (beta)24. Our data suggest that an i.m. prime followed by i.n. boost strategy is worth considering for preventing person-to-person transmission of SARS-CoV-2 and for broad protection against emerging variants."

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