Sebastian has the flu, which can be passed on through contaminated body fluids such as the mucous that is released during coughing and sneezing. what is the highest and most specific level of precautions that should be used in sebastian’s hospital room?

Probably gloves and a mask, because the most common transports of the flu, is people geting germs on their hands, which are carried to their mouth.  A mask would prevent bodily fluids on the hands from getting in the mouth, and gloves will prevent bodily fluids from adhering to the hands.

He would would need a mask and minimal contact body wise with others.