German independent testing lab AV-Test conducted an 18-month study, and gathered up 40 million websites provided by seven different search engines.
10 million websites came from Google and Bing each, with 13 million coming from Russian search engine Yandex, and the rest coming from sites including Blekko and Faroo, reports PC Magazine.
Out of the 40 million sites, AV-Test found only 5,000 websites with malware -- a surprisingly small percentage. Yandex had the most malware websites in its search results, with 3,330 malicious links out of 13 million.
Bing returned 1,285 malicious results out of its 10 million websites. Google only returned a minuscule 272 malicious links out of 10 million. As a percentage of results counted, Google was the best at suppressing malware.
The chances of coming across a malware-infested website in either Google or Bing is slim. The chance of a Google user getting a malicious result is about one in 40,118. But in 2009, Google reported it handled around 320 million searches a day for America, and around 2 billion worldwide. That's potentially about 50,000 malicious sites served per day.