Of the 19 patients (median age: 25 years; range: 19-47 years), 18 were
men; 12 were full-time active duty personnel, and seven were in the Reserve
Component or National Guard (based in Arkansas, Illinois, Indiana, Kansas,
Missouri, New Mexico, and North Dakota). Seventeen were in the Army, one was
in the Navy, and one was in the Marine Corps; 11 were junior enlisted personnel,
seven were noncommissioned officers, and one was an officer. Military specialties
included combat arms (eight), engineering (three), transportation (two), signal
corps (two), medical services (two), supply (one), and military police (one).
Illness onset occurred a median of 81 days (range: 1-189 days) after arrival
in the area of responsibility. Ten patients had evidence of elevated eosinophils
in at least one of the following: peripheral blood (eight), bronchoalveolar
lavage fluid (three), pulmonary tissue (one), or pleural fluid (one). Among
the eight patients with peripheral eosinophilia, the maximum absolute number
of eosinophils was 2,000-6,600 µ/L of blood (normal: <600 µ/L).
The peripheral eosinophilia was detected a median of 6 days (range: 4-11 days)
after illness onset.