Hello, The duration of a fever can vary depending on the underlying cause. In most cases, a fever will last for a few days to a week. As your fever has been declining incrementally and is now at 99.5 degrees, it is a good sign that your body is responding to treatment and fighting off the underlying infection. In terms of contagiousness, it depends on the cause of the fever. If it is due to a viral infection, you may be contagious for several days after the onset of symptoms. It is important to practice good hygiene, such as washing your hands frequently and covering your mouth and nose when you cough or sneeze, to prevent the spread of illness to others. Regarding how long you will feel poorly, it also depends on the underlying cause of the fever. In some cases, such as a common cold or flu, symptoms may last for several days to a week. In more severe cases, such as pneumonia, it may take longer to recover fully. It is important to continue to rest, stay hydrated, and follow any additional recommendations from your caring doctor to help speed up your recovery. If your symptoms persist or worsen, or if you develop new symptoms, it is important to seek medical attention. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Albana Sejdini, General & Family Physician