When a person becomes infected with a norovirus, the virus begins to multiply within the small intestine. After approximately 1 to 2 days, norovirus symptoms can begin. This period between the norovirus transmission and the start of symptoms is the  norovirus incubation period ..In some cases, the norovirus incubation period can be as short as 12 hours.his period between the norovirus transmission and the start of symptoms is the  norovirus incubation period .. In some cases, the norovirus incubation period can be as short as 12 hours.
Drug type: Fluorouracil is an anti-cancer (antineoplastic or cytotoxic) chemotherapy drug. Fluorouracil is classified as an antimetabolite.. (For more detail, see How Fluorouracil Works section below). What Fluorouracil Is Used For: 1  Colon and rectal cancer. 2  Breast cancer.
Your doctor prescribed EFUDEXÂ® fluorouracil) Topical Solutions or Cream because you have been diagnosed with a skin disease called Actinic Keratoses, also known as solar keratoses. These precancerous lesions are the result of years of unprotected exposure to the sunâs ultraviolet (UV) rays.t is believed that the active ingredient (fluorouracil) in EFUDEX interferes with a cellâs ability to reproduce. AK cells, as well as cancer cells, multiply at a faster rate than normal cells. As a result, they absorb the medicine (EFUDEX Solutions or Cream) faster than the surrounding healthy cells.