Microbiology This virus is a single-stranded RNA paramyxovirus. The rash known as Koplik’s spots is pathognomonic. A Measles virus B Influenza virus C Respiratory syncytial virus D Parainfluenza virus 💡 Explanation This virus is a single-stranded RNA paramyxovirus. The rash known as Koplik's spots is pathognomonic. ✓ Correct Answer: A. Measles virus