HT1338 what should I do if I think I may have a virus from an email I received?

I opened an email from my sister which had a link on it.  I click on the link which brought me to a site.  My sister later sent me an email that her computer had a virus and that the email was NOT from her.  What can I do to see if I have the virus?  I do not have an anti-virus installed on my Mac.  Thank You for any help you can give me.

You don't have the virus. If you supplied a password to the site which you clicked the link to, change it immediately. If you supplied a credit card number or anything similar, that information may be in the hands of a hacker.
(78529)

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