This is the best tl;dr I could make, original reduced by 82%. (I'm a bot)

> Finding an antibody that attaches to the M protein - which flags it to the immune system - can stop the bacteria from infecting the body's cells - but these antibodies have proven hard to locate.

> The researchers therefore focused on examining antibodies in patients who had recovered from Strep A infection and identified three so-called monoclonal antibodies.

> Monoclonal antibodies are identical copies of each other, and in this case target a single protein of Strep A. The researchers then investigated in animal studies whether it is possible to use the antibodies to strengthen the immune system in its fight against the bacteria.

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