Preferring, or adapted to live under, a condition of medium temperature or moisture; mesophilous: noting especially bacteria which grow beat in cultures which are maintained at a medium temperature (15–45° C.).

adjective. of, or relating to a mesophile

adjective. living and thriving at moderate temperatures

"Tommy -- Queso Fresco uses rennet and mesophilic culture and ends up a cheese you can melt, similar to mozzarella."

mesophilic bacteria  

20-minute  Gram-positive  acid-fast  acidophilus  anaerobic