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.
How Fluorouracil Is Given: 1  As an injection into the vein (intravenous or IV), or as an infusion. The amount of time and schedule of infusion varies depending on a specific protocol, it may be given over several hours to several weeks. As a topical ointment, a thin coating is applied to the affected skin lesions twice a day, treatment may continue over several weeks. (see document Fluorouracil(cream)).