How is Flu Transmitted?
Spread of the virus
-
Large respiratory droplets (particles over 5 microns in diameter)
that are expelled from the respiratory tract during
coughing or sneezing. Particles do not remain suspended in the
air, and close contact (over 3 feet) is required for transmission.
-
Direct
contact with respiratory droplets or secretions, followed
by touching the nose or mouth.
Incubation period
1-4 days, with an average of 2 days
Infectivity
-
Adults may be able to infect others beginning 1 day before
getting symptoms and up to 7 days after getting sick.
-
Children can be
infectious for up to 10 days, and young children can
shed virus for up to 6 days before their illness onset.
-
Severely immunocompromised
persons can shed virus for weeks or months.
Weekly Flu Updates:
CDC
Weekly Influenza Report
Information from:
Centers for Disease Control and
Prevention. “Infection Control
Measures for Preventing and Controlling Influenza Transmission
in Health-care Facilities.” October 29, 2004. http://www.cdc.gov/flu/professionals/infectioncontrol/
|
