Can a Cat’s Respiratory Infection Heal on Its Own?

Most cat respiratory infections do not clear up on their own. Bacterial or simple colds may self-resolve thanks to the cat's immunity, but the common viral causes — herpes (rhinotracheitis) and calicivirus — require treatment. See a vet; at home, vet-prescribed antibiotics plus lysine help, and isolate the cat since these viruses spread fast.