BACKGROUND: The pandemic @entity683 (H1N1) 2009 [pdm (H1N1) 2009] spread through the world in 2009, producing a serious epidemic in Japan. Since it was suggested early that @entity565 is a risk factor for an increased severity of the @entity281 , the Japanese Society of Pediatric Allergy and Clinical Immunology (JSPACI) organized a working group for countermeasures, and investigated asthmatic @entity1 admitted to the hospitals for pdm (H1N1) 2009 @entity281 . METHODS: An appeal was made on the home page of the JSPACI to medical practitioners to input clinical information about asthmatic and non-asthmatic @entity1 (0-19 years) admitted to the hospital with pdm (H1N1) 2009 @entity281 . RESULTS: A total of 862 @entity1 (390 with @entity565 , and 472 without @entity565 ) from 61 medical centers were registered, and the data of 333 asthmatic @entity1 and 388 non-asthmatic @entity1 in all were entered in the analyses. The mean age was 7.4    2.9 years in the @entity565 group and 6.9    3.8 years in the non- @entity565 group. The percentage of @entity1 admitted for respiratory symptoms was significantly higher in the @entity565 group than in the non- @entity565 group (p < 0.001). There was no significant difference in the frequency of admission to the ICU or need for mechanical ventilation support between the two groups. No definite trend was detected in the relationship between the severity of @entity565 and the intensity of @entity565 attack. Antiviral drugs were administered within 24 hours in about 85% of the @entity1 in both groups. CONCLUSIONS: Asthma may not be a risk factor for severe pdm (H1N1) 2009 @entity281 in @entity1 .

Hospitalizations associated with pandemic @entity683 (H1N1) 2009 in asthmatic XXXX in Japan.

@entity1 :: ('9606', 'Species') :: ['children', 'patients'] @entity683 :: ('MESH:D007251', 'Disease') :: ['influenza A'] @entity281 :: ('MESH:D007239', 'Disease') :: ['infection'] @entity565 :: ('MESH:D001249', 'Disease') :: ['asthma']
@entity1 :: (9606,Species) :: ['children']
