Is there any negative SEO effect of having comma's in URL's?

[RichBestSEO]

Hello,

I have a client who has a large ecommerce website. Some category names have been created with comma's in - which has meant that their software has automatically generated URL's with comma's in for every page that comes beneath the category in the site hierarchy.

eg. 1 : http://shop.deliaonline.com/store/music,-dvd-and-games/dvds-and-blu_rays/

eg. 2 : http://shop.deliaonline.com/store/music,-dvd-and-games/dvds-and-blu_rays/action-and-adventure/

etc...

I know that URL's with comma's in look a bit ugly! But is there 'any' SEO reason why URL's with comma's in are any less effective?

Kind Regs,

RB

[HiveDigitalInc]

I have never seen any evidence that commas are negative, however usability can often drive the social factors that may play more and more a role in the future. I wouldn't make it a priority to change those URLs now, but when the time comes (perhaps with a redesign of the website), it would be worth your while to go ahead and remove them.

[gcdtechnologies]

Commas in the URL aren't necessarily at an SEO disadvantage. It might be a good idea to change them for better usability and better CTRs, but as Russ says, I don't think this is an urgent task.