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Would it give increased protection, same, or less?
I've no idea what you mean. The question was whether a vaccine could make a LFD test blow positive - it can't.
What is "it" in your question?
Greenbank-
Will my booster yesterday cause me to show positive if I take an LFT today?
A. No. The vaccine will not cross-react with the lateral flow device (LFD). Therefore if your LFD is positive it is very likely that you have the COVID-19 infection.
So, "It" is, if somebody who has a Covid-19 infection has a booster, does that increase the protection (eg, double dose), same or will the Covid-19 infection and booster cancel each other out and result in a lower level of protection?
Muppetteer
Would it give increased protection, same, or less?