Thanks for the replies. Subsequently to my first post I also did some reading on the matter. It appears that the jury is still out there
Some say, especially those with an interest in creating fear amongst users, that malware (which include viruses) is a real thread. Most users, on the other hand, felt we are safe provided you consult the community (market), apply own common sense and read the permissions you are granting. For now, I will stay with the latter group.