It's baaaaaack. Norovirus has brought "gastrointestinal misery" to Brigham and Women's, Mass General, and Children's Hospital Boston daycare, according to the Globe. People aren't washing their hands as much as they should be, and norovirus loves dirty hands.

Last year at this time, 3,700 people went to local emergency rooms thanks to norovirus. Since we're experiencing déjà vu, we'll go all out and repeat the tips we read from the CDC on fighting norovirus:

--Frequently wash your hands, especially after toilet visits and changing diapers and before eating or preparing food.
--Carefully wash fruits and vegetables, and steam oysters before eating them.
--Thoroughly clean and disinfect contaminated surfaces immediately after an episode of illness by using a bleach-based household cleaner.
--Immediately remove and wash clothing or linens that may be contaminated with virus after an episode of illness (use hot water and soap).
--Flush or discard any vomitus and/or stool in the toilet and make sure that the surrounding area is kept clean.

In general, be a little obsessive-compulsive about cleaning until this gets cleared up.

Image of Slimer from Ghostbusters from Wikipedia. We used it last time because it is so evocative of illness-related nastiness.