Viruses wile using AVAST

I Have Avast Premiere and I got a Viruses infection while Avast said I was covered! What will avast do to fix the problem !!!???

How do you know you are infected? No AV is 100% because everyday more than 22,50000 viruses come out.

If you think you are infected,follow the below link and attach logs here:
https://forum.avast.com/index.php?topic=53253.0