The really wild thing will be if autologous CAR-T or CAR-M can become a thing. Then you can just dump in already targeted and angry T-cells or macrophages to fight the infection. Additionally cool, fighting things like mold, yeast, and protist infections could then become "routine".

If the patient isn't too sick, you could even get to in situ programming of endogenous lymphocytes and myeloid cells a la Matthias Stephan's nanoparticle loaded with DNA or mRNA. https://stephanlab-fhcrc.squarespace.com/research-projects