【新型インフル UP DATE 12-3】 メキシコで流行した経過（3）

 

TABLE 1. Timeline of key events in detection and response to outbreak of swine-origin influenza A (H1N1) virus (S-OIV) infection --- Mexico, April 12--30, 2009
Date	Event
April 12	Respiratory illness outbreak reported to the Pan American Health Organization (PAHO).
April 17	A case of atypical pneumonia leads to an alert to enhance surveillance.
April 17--22	Field investigation of respiratory illness undertaken.
April 23	Public Health Agency Canada confirms cases of S-OIV infection.
April 23	Cluster of S-OIV illness reported to PAHO.
April 24	Health authorities implement public health measures for all airport passengers and vaccination of health-care workers with seasonal influenza vaccine.
April 25	National decree allows for house isolation of persons with suspected cases.
April 26	National laboratory capacity to diagnose S-OIV infection established in Mexico.
April 27	School closure is mandated throughout the country.
April 30	Status: 97 laboratory-confirmed cases of S-OIV infection in Mexico.

FIGURE. Number of confirmed (N = 97) and probable (N = 260)* cases of swine-origin influenza A (H1N1) virus (S-OIV) infection, by date of illness onset --- Mexico, March 15--April 26, 2009

* Probable cases for which dates of illness onset are known.

The figure above shows the number of confirmed (N = 97) and probable (N = 260)* cases of swine-origin influenza A (H1N1) virus (S-OIV) infection, by date of illness onset, in Mexico, during March 15 to April 26, 2009.

From March 15 through April 17, the daily number of confirmed and probable cases combined did not exceed five cases. However, the start of a substantial increase is indicated on April 18. This increase peaks at approximately 55 cases on April 22 and 23, before declining to fewer than 10 cases on April 26.

TABLE 2. Number of patients and deaths from laboratory-confirmed infection with swine-origin influenza A (H1N1) virus (S-OIV), by age group --- Mexico, April 1--27, 2009*
Age group (yrs)	No.	Deaths
<5	5	0
5--19	4	2
20--39	9	3
40--59	6	2
≥60	0	0
Total	24	7

* Does not include 73 laboratory-confirmed cases of S-OIV infection (reported on April 29) for which no demographic data are available.

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Date last reviewed: 4/30/2009