Update: Influenza activity--United States, September 28, 2014-February 21, 2015.
MMWR Morb Mortal Wkly Rep
; 64(8): 206-12, 2015 Mar 06.
Article
in En
| MEDLINE
| ID: mdl-25742380
ABSTRACT
Influenza activity in the United States began to increase in mid-November, remained elevated through February 21, 2015, and is expected to continue for several more weeks. To date, influenza A (H3N2) viruses have predominated overall. As has been observed in previous seasons during which influenza A (H3N2) viruses predominated, adults aged ≥65 years have been most severely affected. The cumulative laboratory-confirmed influenza-associated hospitalization rate among adults aged ≥65 years is the highest recorded since this type of surveillance began in 2005. This age group also accounts for the majority of deaths attributed to pneumonia and influenza. The majority of circulating influenza A (H3N2) viruses are different from the influenza A (H3N2) component of the 2014-15 Northern Hemisphere seasonal vaccines, and the predominance of these antigenically and genetically drifted viruses has resulted in reduced vaccine effectiveness. This report summarizes U.S. influenza activity* since September 28, 2014, and updates the previous summary.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Influenza, Human
Type of study:
Screening_studies
Country/Region as subject:
America do norte
Language:
En
Journal:
MMWR Morb Mortal Wkly Rep
Year:
2015
Document type:
Article