<prompt> All of the following viruses cause pneumonia except-CytomegalovirusMumpsMeaslesRetrovirus  <response>: complications of mumps include epididymo orchitis,meningitis ,meningoencephalitis, and less common comolicatiin include ahritis ,oophoritis ,pancreatitis etc. REF:ANANTHANARAYAN AND PANIKERS TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:508 