The term 'throat bug' can refer to two different illnesses: strep throat, which is caused by the bacteria Streptococcus pyogenes, and FROG throat, which is caused by a virus known as Ranavirus. Strep throat is a contagious bacterial infection that affects the throat and can cause fever, sore throat, and swollen lymph nodes. FROG throat is an infectious disease of amphibians that can cause ulcers in the throat and mouth, as well as other symptoms such as lethargy and loss of appetite.