Can anyone give links to the latest antivirus, antispyware detection rate tests?
www.av-comparatives.org is considered one of the most authoritative test sites.
From the main page, click on the “comparatives” tab, and then “main tests”. (Or any other tests you want to look at.)
It is wise to have a read of the testing methodology first, so you can better interpret results.
Avast always scores well.
I can’t believe that avast was one of the lowest scorers in Retrospective/Proactive Test. I hope the new behavior shield can solve this problem!
I’m glad to see that avast! did so well on the “on demand” category. 
How often does AV Comparatives test?
They test products every 3 moths starting in February.
February
May
August
November