Paramyxoviridae is a family of viruses known for causing respiratory infections in humans and animals. This family includes notable viruses such as measles virus and mumps virus. They are characterized by their single-stranded RNA genomes and their ability to form syncytia, which are large cells formed by the fusion of infected cells. These viruses are typically transmitted through respiratory droplets and can lead to various diseases, ranging from mild to severe. Vaccines are available for some Paramyxoviridae members, such as the measles, mumps, and rubella (MMR) vaccine, which helps prevent outbreaks and protect public health.