As examples, exertional breathlessness was included to identify workers with chronic HP (without work-related respiratory symptoms), and the recurrent flu-like symptom category was modified to avoid identifying workers with humidifier fever.
The flu virus is notorious for its recurrent epidemics in humans, and these epidemics arise from various forms of viral evolution to escape host immunity.
Bouts of asthma and recurrent dysentery, contracted in Brazil, weakened her system and made her susceptible to colds and flu; her teeth bothered her and required extractions, root canals, and bridges; rheumatism made walking or typing painful at times.
Although a combination of i.v. busulfan (Bu) and fludarabine (Flu) is a safe, reduced-toxicity conditioning program for acute myelogenous leukemia/myelodysplastic syndromes (AML/MDS), recurrent leukemia posttransplantation remains a problem.
Acute symptoms in humans are similar to flu and may include fever, sweating, headaches, back pains, and physical weakness, while chronic symptoms are recurrent fever, joint pain, and fatigue (Acha and Szyfres 2001; CDC 2007).
