Swine Flu A H1N1 Symptoms
The spectrum of disease caused by new influenza A (H1N1) virus infection ranges from non-febrile, mild upper-respiratory tract illness to death. Most cases appear to be typical influenza-like illness and recover spontaneously. The most commonly reported symptoms are:
- fever (87% to 94%)
- cough (87% to 92%)
- fever,
- sore throat (48% à 66%),
- headache 38%
- myalgia 35%
- malaise and headache 35%
- chills 28%
- rhinorrhoea 27%
- diarrhoea 23%
- sputum 16%
- vomiting 15%
- dyspnoea 14%
- arthralgia 13%
Approximately 2–6% of confirmed cases have been admitted to hospital. Almost one-half of the patients hospitalized have had underlying conditions as:
- pregnancy,
- asthma or other lung diseases,
- diabetes,
- morbid obesity,
- autoimmune disorders and associated immunosuppressive therapies,
- neurological disorders
- cardiovascular disease
Rapidly progressive respiratory disease has accounted for most severe or fatal cases. In Mexico, the median time from onset of illness to hospitalization was 6 days, compared with a median of 4 days in hospitalized cases in the United States.
In fatal cases, the presenting manifestations have included:
- fever,
- shortness of breath,
- myalgia,
- severe malaise,
- tachycardia,
- low oxygen saturation,
- sometimes hypotension and cyanosis
Several patients experienced cardiopulmonary arrest shortly after arrival at hospital. Diarrhoea has been uncommon in hospitalized cases. The clinical course has been notable for severe pneumonia, as well as rapid progression to acute respiratory distress syndrome (ARDS) and renal or multi-organ failure (24% of fatal cases). Few patients have had evidence of bacterial infection upon admission.
Source: WHO; Weekly epidemiological record, No. 21, 22 may 2009