What epidemiological investigations are taking place in response to the recent outbreak?

April 29, 2009, 10:55 PM ET

CDC works very closely with state and local officials in areas where human cases of H1N1 (swine flu) infections have been identified. In California and Texas, where EpiAid teams have been deployed, many epidemiological activities are taking place or planned including:

Active surveillance in the counties where infections in humans have been identified;
Studies of health care workers who were exposed to patients infected with the virus to see if they became infected; Studies of households and other contacts of people who were confirmed to have been infected to see if they became infected; Study of a public high school where three confirmed human cases of influenza A (H1N1) of swine origin occurred to see if anyone became infected and how much contact they had with a confirmed case; and Study to see how long a person with the virus infection sheds the virus.