A respiratory illness is a disease that affects a person’s lungs or breathing. Viruses are a common cause of respiratory illness, especially during fall and winter — sometimes called “cold and flu season.”
Examples of respiratory illnesses caused by viruses include:
Common colds (rhinovirus, coronavirus, and other viruses)
Flu (influenza viruses)
RSV (respiratory syncytial virus)
COVID-19 (novel coronavirus: SARS-CoV-2)
View our Respiratory Illness Report to learn about current respiratory virus trends.

Disease Information
Communicable diseases are diseases that spread between people or animals. Click on the buttons below to learn about specific diseases. For more disease information, visit the CDC's health topics index.

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Communicable Disease Data Dasbhoards
Communicable disease data from Kitsap, Clallam, and Jefferson counties, compiled from CDC, WA DOH, and local sources.
Suggested citation: Kitsap Public Health District. (2025). Region 2 Communicable Disease Surveillance Summary Dashboards. [Data Set]. https://public.tableau.com/app/profile/kitsap.public.health.district.assessment.and.epi.team/viz/Region2CommunicableDiseaseSurveillanceSummary/Welcome, accessed -ENTER ACCESS DATE-.
Symptoms
Different respiratory illnesses have different symptoms. Runny nose, coughing, sneezing, tiredness, fever, and sore throat are all symptoms commonly associated with seasonal respiratory illnesses. Learn more about symptoms of colds, flu, RSV and COVID-19.
Note: "Stomach flu" or "stomach bugs" involving diarrhea and vomiting are not typically related to influenza (flu). "Stomach flu" is often caused by norovirus, an extremely contagious virus that causes gastrointestinal illness.
Who is most at risk?
What to do if you are sick
Preventing respiratory viruses
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Respiratory Viruses
Looking for more healthcare guidance or resources? Visit our Provider Resources page.