Rubulavirus
If not vaccinated against mumps, susceptible individuals catch the disease by breathing around an infected person who has coughed or sneezed, releasing their contaminated saliva. Those who have had mumps are usually immune to future infections of the disease. Children have the highest risk of catching mumps, and it is rare for an adult to contract mumps. The incubation period for mumps can range from a couple weeks to a month, while the illness period is a few weeks. The swelling of the salivary glands is caused when the virus travels from the respiratory tract to the salivary glands and multiplies within the glands, causing the glands to swell.
Mites of domestic animals
Compared to ticks and insects of domestic animals the parasitic mites are of limited importance as transmitters (vectors) of pathogenic organisms to domestic animals. Some mites are the intermediate host of parasitic worms, but not defined as vectors because they do not parasitize a host. For example, free living mites of the family Oribatidae ingest the eggs of "Moniezia expansa" tapeworm of sheep; the sheep then ingest the mites whilst grazing. "Dermanyssus gallinae" has been shown to transmit the virus causing St Louis encephalitis virus between chickens. (the main transmitters of this virus to humans are "Culex" mosquitoes). Various species of trombiculid mite transmit the bacterium "Orientia tsutsugamushi", the causative agent of scrub-typhus, a notorious disease of humans in South East Asia. "Leptotrombidium deliniense" is the most important of several species of mite transmitting this bacterium.