Here is information regarding an incoming infection (a type of infection but apparently not a MacOS infection) blocked today from downloading by Avast for Mac Free Antivirus while using Mojave 10.14.2. AVAST has blocked a Threat! Infection: Malware-gen [Trj] Attached File type PDF MS Office/Microsoft Outlook This type of infection doesn't require MS Office or Outlook to spread. Any downloaded file attachment from online email services could spread it. There has been a lot of misinformation posted here regarding Mac vulnerabilities and whether Mac users need broad spectrum antivirus software protection. I cannot emphasize enough the importance of utilizing as much security protection that is available along with common sense. Some adjustments can be made to the MacOS settings including enabling the firewall under System Preferences>Security and Privacy. A major weak point in computer system security is the browser. Safari security has improved in recent years and it's probably better than it ever has been security wise but any software tied to the OS has been a target for malicious exploits in the past. This is why third party browsers can be an excellent option to enhance security and privacy. Regarding the use of cross platform software such as MS Office... It is often the target of malicious exploits. Email software such as Outlook can also be a route of infection especially with file attachments. Users on a MS Windows platform often transfer infections via file attachments to unsuspecting associates using Macs who in turn can harbor and transfer those same infected attachments to other Windows users. I highly recommend that Mac users seriously consider using a general broad spectrum antivirus software which includes email and browser protection and anyone who hasn't in the past should seriously consider utilizing the importance of antivirus security. There are many antivirus software options including free, paid subscription and corporate versions. Any recommendations from current Mac AV users to other Mac users who currently don't have Mac AV software are welcome in this thread. This is not a thread debating whether Mac users do or don't need antivirus software. That has been debated in other threads and ultimately that is obviously up to every Mac user for themselves. This thread is regarding the benefits users have already had from utilizing AV software for their Macs... What AV software they are using or have used and what infections they have seen that have been blocked... or what infections have been found and removed by their Mac antivirus software.