Because several different germs can cause encephalitis, spread of the infection may take place in different ways. For example, mosquitoes transmit viruses that cause West Nile encephalitis, St. Louis encephalitis, and western equine encephalitis.ncephaliti s may be caused by a variety of viruses, bacteria, and other organisms. These agents include:. 1  Measles, chicken pox, rubella (German measles), mumps, polio, and other viral illnesses, which generally lead to a mild form of encephalitis known as postinfectious or para-infctious encephalitis.
On average, the warmest days of the year in Seattle occur between July 26 and August 8, with average highs of 76 degrees. These are some of the best days to spend on some of Seattle's beaches. Alki Beach Park is open from 6 a.m. until 11 p.m.
Average Weather in September in Seattle Washington, United States. In Seattle, the month of September is characterized by falling daily high temperatures, with daily highs decreasing by 8Â°F, from 75Â°F to 67Â°F over the course of the month, and rarely exceeding 83Â°F or dropping below 60Â°F.