<prompt> Wahin Finkeldey giant cells are seen in:MumpsRubellaMeaslesPolio  <response>: Fusion of infected cells results in multinucleated giant cells, aka Wahin-Finkeldey giant cells that are pathognomonic for measles Measles: IP- 8-12 days Receptors for measles virus- CD150 PVRL4 CF: Prodromal phase- fever, conjuctivitis, coryza Koplik spots on inner cheeks at the levels of 1st 2nd molars, vagina, conjuctiva. Rash begins behind the ear spreads downwards MC complication- otitis media MC cause of death- pneumonia Mumps: Spread by respiratory droplets IP- 12-25 days CF: Fever BL or UL parotid swelling Orchitis common in adolescents male MC complication- Aseptic meningitis 