- Respiratory infection caused by influenza A or influenza B virus
- 487.0 influenza with pneumonia
- 487.1 influenza with other respiratory manifestations
- 487.8 influenza with other manifestations
- 488 influenza due to certain identified influenza viruses
– 488.0 influenza due to identified avian influenza virus
– 488.1 influenza due to identified novel H1N1 influenza virus
- V04.81 need for prophylactic vaccination and inoculation, influenza
- Annual epidemics of seasonal influenza typically occur during late fall through early spring.
– Typical incubation period is one to four days (mean two days).
– Children may be infectious for >10 days (from six days before the onset to 10 days after).
– Influenza can survive on dry inanimate surfaces for one to two days.
- Illness may be more serious in children younger than age 2 years, especially age 6 months and younger, and in children with chronic immunosuppression or with respiratory or neurologic conditions.
- Common complications include
– Otitis media
– Acute sinusitis
– Exacerbations of chronic pulmonary or cardiac disease
- Febrile seizure
- Pattern of illness may vary from mild respiratory illness to prostration with nonspecific signs and symptoms.
- Initial presentation may be abrupt onset of fever (temperature 37.7-40˚C [100-104˚F]) and dry cough.
- Symptoms that are often more common or more severe with influenza than with the common cold include
– Dry cough
- Symptoms that are often less common with influenza (more common with common cold) include
– Nasal congestion
– Sore throat
- Fever is common.
- Other findings may include
– Conjunctival injection
– Nonexudative pharyngitis
– Rhonchi or scattered rales