In a related question, what are the odds of surviving being stabbed in the belly and falling into the river which runs through a major city in the same time period?

According to descriptions in 9th Century Anglo-Saxon documents (such as Bald's Leech book and Leech book III) you would have a higher chance of developing an infection in a city, especially during the summer months when infections were more common.

However provided you did not already develop an infection you would have more of an opportunity to get it treated by a physician due to being in a large population center. The documents above even reference to using degradable silk to sew up wounds and of treating sutures with antiseptics to prevent infections.

Online scans of these text can be consulted at The British Library Website