Antibiotic prescription rates for acute respiratory tract infections in US ambulatory settings.
BACKGROUND
During the 1990s, antibiotic prescriptions for acute respiratory tract infection (ARTI) decreased in the United States. The sustainability of those changes is unknown.


OBJECTIVE
To assess trends in antibiotic prescriptions for ARTI.


METHODS
The National Ambulatory Medical Care Survey and National Hospital Ambulatory Medical Care Survey data (1995-2006) were used to examine trends in antibiotic prescription rates by antibiotic indication and class. Annual survey data and census denominators were combined in 2-year intervals for rate calculations.


METHODS
National annual visit rates and antibiotic prescription rates for ARTI, including otitis media (OM) and non-ARTI.


RESULTS
Among children younger than 5 years, annual ARTI visit rates decreased by 17% (95% confidence interval [CI], 9%-24%), from 1883 per 1000 population in 1995-1996 to 1560 per 1000 population in 2005-2006, primarily due to a 33% (95% CI, 22%-43%) decrease in OM visit rates (950 to 634 per 1000 population, respectively). This decrease was accompanied by a 36% (95% CI, 26%-45%) decrease in ARTI-associated antibiotic prescriptions (1216 to 779 per 1000 population). Among persons aged 5 years or older, ARTI visit rates remained stable but associated antibiotic prescription rates decreased by 18% (95% CI, 6%-29%), from 178 to 146 per 1000 population. Antibiotic prescription rates for non-OM ARTI for which antibiotics are rarely indicated decreased by 41% (95% CI, 22%-55%) and 24% (95% CI, 10%-37%) among persons younger than 5 years and 5 years or older, respectively. Overall, ARTI-associated prescription rates for penicillin, cephalosporin, and sulfonamide/tetracycline decreased. Prescription rates for azithromycin increased and it became the most commonly prescribed macrolide for ARTI and OM (10% of OM visits). Among adults, quinolone prescriptions increased.


CONCLUSIONS
Overall antibiotic prescription rates for ARTI decreased, associated with fewer OM visits in children younger than 5 years and with fewer prescriptions for ARTI for which antibiotics are rarely indicated. However, prescription rates for broad-spectrum antibiotics increased significantly.
Grijalva
Carlos G
CG
Department of Preventive Medicine, Vanderbilt University School of Medicine, 1500 21st Ave, Ste 2600, The Village at Vanderbilt, Nashville, TN 37232-2637, USA. carlos.grijalva@vanderbilt.edu
Nuorti
J Pekka
JP
Griffin
Marie R
MR
D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000554:Ambulatory Care Facilities / Q000706:statistics & numerical data; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D002648:Child; D002675:Child, Preschool; D004363:Drug Utilization; D005260:Female; D019538:Health Care Surveys; D006801:Humans; D007223:Infant; D008297:Male; D010033:Otitis Media / Q000188:drug therapy / Q000453:epidemiology; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data; D012141:Respiratory Tract Infections / Q000188:drug therapy* / Q000453:epidemiology; D014481:United States / Q000453:epidemiology; D055815:Young Adult
D000900:Anti-Bacterial Agents
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