Antivirus for WordPress to combat new vulnerabilities

This month my website which is built on WordPress was attacked by the virus SoakSoak. I've been told that unexpected attacks like this are rather normal on the Internet.
The thing is that after SoakSoak I do not feel safe anymore.
An expert could finally solve my problem, but now I would want to install a good antivirus to harden my WordPress.
Can you please recommend a good antivirus for WordPress able to prevent new attacks like SoakSoak?
Thank you in advance for your response.
