• Will my booster yesterday cause me to show positive if I take an LFT today?

    No, LFD's test for active parts of the virus.

    The vaccines only contain inactive parts of the virus, but they still trigger your body's immune system into going "oh shit, we better deal with this" which includes symptoms like chills, fever, etc.

    Random NHS link: https://www.ouh.nhs.uk/working-for-us/staff/covid-staff-faqs-vaccine.aspx

    "
    Q. I had my vaccine yesterday. I did my lateral flow testing today and it has turned positive. Is this as a result of the vaccine?

    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.
    "

  • 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.

    Would it give increased protection, same, or less?

  • 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?

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