Of the 458 persons with available data, illness onsets were between September 8, 2008 and January 2, 2009.

Detection of influenza H5N1 is more likely from specimens collected within the first 3 days of illness onset.

The "last date of illness onset" for Singapore (Table) is now June 14, 2003.

Most cases are recent: for those with known illness onset, the range of onset is 08/25/2006 to 09/03/2006.

Treatment should be started within 48 hours of illness onset and continue for 5 days.

Enhanced surveillance should continue for 50 days (two times the maximum incubation period) after the date of illness onset in the last identified case.

Of the 8 persons with available data, illness onsets occurred March 28-April 14, 2009.

Outpatients, particularly those with risk factors for severe illness who are not improving, might also benefit from treatment initiated more than 48 hours after illness onset.

The five patients had illness onset from 4 to 17 days after vaccination.

Of the 18 patients interviewed to date, seventeen give a history of consuming raw almonds within a few days before illness onset.