Hello dear, Thank you for your contact to health care magic. I read and understand your concern. I am Dr Arun Tank answering your concern. No, Streptococcus milleri is not the virus but it is bacteria. It Grams positive cocci The infection caused by this bacteria is pneumonia. Viral infection may be primary agent of infection but chances of pneumonia is caused by Streptococcus milleri is more. I advice you to get bacteria s sensitivity done. And take the drugs as per the reports. Drugs taken as per the report will cure you earlier. I also advice your father to do respiratory exercise. It increases the short ness of duration of illness. I will be happy to answer your further concern on bit.ly/DrArun. Thank you, Dr Arun Tank Infectious diseases specialist, HCM.