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.
Efudex (fluorouracil) Efudex Program for sun damaged skin: The âEraserâ. Efudex ( fluorouracil)is a topical cream that has remained the GOLD STANDARD for treatment of pre-cancers called actinic keratosis. It is an optional treatment for fair skin individuals with multiple or recurrent actinic keratosis. It is particularly useful for those with a history of strong sun exposure or a personal or family history of skin cancer. Efudex is used for 2-6 weeks depending on the area being treated. It is a selective cream that attacks only pre-cancers and early basal cell cancers.