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.
Seattle averages 24 days a year when the thermometer reaches into the 80s Â°F (over 27 Â°C). The temperature typically climbs to 90 Â°F (32 Â°C) on just one or two days a year. Days as hot as 100 Â°F (38 Â°C) are not normal for the city. Nearly every day in Seattle is at least as warm as 40 Â°F (4 Â°C). Only once a year on average does the temperature remain below freezing for the entire day. The thermometer dips to freezing or below on 23 nights each year. Seattle normally gets as chilly as 20 Â°F (-8 Â°C) once or twice a year.