Human<unk>  type A and B cause majority of infections. Type A has more severe disease course.
Occurs in 6ft radius around infected patient who is sneezing and/or coughing
Viral shedding lasts ~5d (starts 24-48hr before onset of symptoms)
Longer duration of shedding occurs in children, elderly, patients with chronic illnesses
Shedding from asymptomatic individuals does not contribute significantly to transmission
Use of either N95 or plain surgical mask by healthcare professionals caring for patients with proven<unk>  helps to decrease rates of provider contraction of<unk> .
Longer duration of shedding occurs in children, elderly, patients with chronic illnesses
Shedding from asymptomatic individuals does not contribute significantly to transmission
Age <2 years or >65 years
Pregnancy through 2 weeks after delivery
Chronic pulmonary (including asthma), cardiovascular (except hypertension), renal, hepatic, hematological (including sickle cell disease), neurologic, neuromuscular, or metabolic disorders (including diabetes mellitus)
Immunosuppression, including that caused by medications or by HIV
Persons younger than 19 years of age who are receiving long-term aspirin therapy
American Indians and Alaska Natives
Morbid obesity
Patients in nursing homes or chronic-care facilities
A history of<unk>  vaccination does not rule out<unk>  in an ill patient with clinical signs and symptoms compatible with<unk> .
Therefore, vaccination status should not impede the initiation of prompt antiviral treatment.
Influenza
Pertussis
URI
Rubella
Pneumonia
Anthrax
Sinusitis
Diphtheria