It reflects the period of time from the moment the virus enters the host until the time the very first symptoms of an infection are detected. (mypetneedsthat.com)
In retrospect, she realized that her very first symptom had occurred 10 years earlier, when she was unable to pick up an 8 - pound cat when working in an animal shelter. (health.com)
«There's also a window of 10 years from first symptoms until we can no longer reverse it,» he adds. (marinmagazine.com)