text: HPIVs are negative-sense, single-stranded RNA viruses that possess fusion and hemagglutinin-neuraminidase glycoprotein "spikes" on their surface. There are four serotypes types of HPIV (1 through 4) and two subtypes (4a and 4b). The virion varies in size (average diameter between 150 and 300 nm) and shape, is unstable in the environment (surviving a few hours on environmental surfaces), and is readily inactivated with soap and water.
option_0: Human parainfluenza viruses classification
option_1: COVID-19 differential diagnosis
option_2: Influenza classification
option_3: COVID-19-associated Guillain-Barre syndrome differential diagnosis
option_4: COVID-19-associated pneumonia differential diagnosis
option_5: Swine influenza differential diagnosis
option_6: Human parainfluenza viruses epidemiology and demographics
option_7: Enterovirus 68 differential diagnosis