Also his name, MD virologist (could be just a name

Also his name, MD virologist (could be just a name) Is not normal medical terminology. There is no such thing as a clinical doctor (whom he portrays himself as) who is a medical virologist or a doctor of viruses. There are infectious disease experts who may specialize in virology but even the name MD virologist seems to be chosen to portray a particular expertise in the knowledge of viruses. But if other MDs like myself know that such a title does not exist in clinical practice then For what reason exactly would a doctor choose to present himself on a board such as this w/ said made up title?