How to test whether the website is effected by virus ?

This is a common question for us...

Before opening any website we use to get some doubt like Is this  site right site or not ?

If you want to know whether that site is effected by any malware threat or Virus ?

Google has provided wonderfull tool to us..  paste this url in your browser and add whatever site you want to test for example www.example.com

 http://www.google.com/safebrowsing/diagnostic?site=

Final URL would be like this..

 http://www.google.com/safebrowsing/diagnostic?site=www.example.com

It will show Google's diagnostic report Results as below...

Safe Browsing Diagnostic page for example.com
What is the current listing status for example.com?
This site is not currently listed as suspicious.

What happened when Google visited this site? Of the 53 pages we tested on the site over the past 90 days, 0 page(s) resulted in malicious software being downloaded and installed without user consent.

The last time Google visited this site was on 2012-04-14, and suspicious content was never found on this site within the past 90 days. This site was hosted on 3 network(s) including AS16876 (ICANN), AS40528 (ICANN), AS16637 (MTNNS-).

Has this site acted as an intermediary resulting in further distribution of malware? Over the past 90 days, example.com did not appear to function as an intermediary for the infection of any sites.

 Has this site hosted malware? No, this site has not hosted malicious software over the past 90 days. Next steps: Return to the previous page.

If you are the owner of this web site, you can request a review of your site using Google Webmaster Tools. More information about the review process is available in Google's Webmaster Help Center.