For viruses, classification is normally based on type of nucleic acid, morphology, presence or absence of an envelope and replication properties. A number of families is recognized, with the family name ending in -viridae, e.g. Poxviridae (double-stranded DNA, enveloped animal viruses).
Heartburn, regurgitation, and dyspepsia are a few of the most common acid reflux symptoms. Heartburn. Also called acid indigestion, heartburn is a burning pain or discomfort that can move up from your stomach to the middle of your abdomen and chest. The pain can also move into your throat.
Signs and symptoms of acid reflux. Acid reflux, whether it is a harmless, isolated episode of the sort we all experience at some point, or the persistent problem of gastroesophageal reflux disease, usually produces the same main symptom: 2,4,7. 1  Heartburn.