Continue to have check ups just because you are treated doesn’t mean it’s gone fully and can’t come back.
Bacteria, molds and yeast are the most important microorganisms that cause food spoilage and also find the maximum exploitation in production of food and food products. Different strains of bacteria and fungus are used for fermentation of dairy products for production of a wide variety of cultured milk products.
I think its thru blood cells im not sure though.