See the National Museum of Civil War Medicine in Frederick, Maryland website: http://www.civilwarmed.org/research.cfm
"Febris remittens" is medical Latin for "remittent fever," a condition in which the fever abates and then returns with the cycle repeated within a 24 hour period. The causes of the fever can be attributed to many diseases. Longer cycle fevers are called "intermittent fevers" with malaria being a typical cause of this condition.
"V. S." is medical Latin shorthand for "vul sclopeticum" [sometimes abbreviated "Vul Sclopt." in the records] which means a gunshot wound. An example copied from the records of a 12th Louisiana soldier: "Vul Sclopt: Gunshot wound through right thorax passing through right lung by common lead ball."
Based upon the service records usage of the term that I had found previously, I thought perhaps it might mean a gunshot wound in which no bones are broken or shattered, but that appears not to be the case since while doing this search I came across a "v. s. of the hand" in a soldier's record. He didn't loose the hand, but bones had to have been broken.
I will send a query to the NMCWM and see what they say.
Hugh