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OBJECTIVE To determine whether influenza vaccination of pregnant women prevents visits for respiratory illness in their infants born during the influenza season. DESIGN Retrospective matched cohort study. SETTING Four managed care organizations in the United States. Patients A total of 41 129 infants (3160 and 37 969 born to vaccinated and unvaccinated(More)
AIM To analyse rehospitalisation of newborns of all gestations. METHODS A total of 33,276 surviving infants of all gestations born between 1 October 1998 and 31 March 2000 at seven Kaiser Permanente Medical Care Program (KPMCP) delivery services were studied retrospectively. RESULTS Rehospitalisation rates within two weeks after nursery discharge ranged(More)
The Advisory Committee on Immunization Practices of the Centers for Disease Control and Prevention recommends influenza vaccination for women who will be in the second or third trimester of pregnancy during the influenza season. We analyzed hospital admissions with principal diagnoses of influenza or pneumonia and influenza-like illness (ILI) outpatient(More)
BACKGROUND The measles-mumps-rubella vaccine has been associated with immune thrombocytopenia purpura in 2 small studies. METHODS By using the Vaccine Safety Datalink, we identified measles-mumps-rubella-vaccinated children aged 1 to 18. A case of immune thrombocytopenia purpura was defined as a patient with a platelet count of < or = 50,000/microL with(More)
OBJECTIVE To evaluate the effectiveness of 1 and 2 doses of the 2003-2004 influenza vaccine in preventing medically attended influenza-like illness (ILI) among children 6 to 23 months and 6 months to 8 years of age. DESIGN AND METHODS Outpatient and emergency department visits and immunization records were used to conduct a retrospective cohort study(More)
OBJECTIVE To evaluate the incremental effect of a second client reminder postcard or an influenza tool kit targeted toward employers on increasing influenza vaccination rates among adults age < 65 years at high risk for complications from influenza illness. METHODS In this demonstration study, enrollees of 3 managed care organizations (n = 8881) were(More)
BACKGROUND During the first year that the rhesus rotavirus tetravalent vaccine (RRV-TV) was licensed, the Vaccine Adverse Event Reporting System received several reports of intussusception after vaccination. To evaluate the risk of intussusception, we conducted a retrospective cohort study in ten managed care organizations. METHODS Cases of(More)
CONTEXT Beginning with the winter season of 2004-2005, influenza vaccination has been recommended for all children 6 to 23 months old in the United States. However, its safety in young children has not been adequately studied in large populations. OBJECTIVE To screen for medically attended events in the clinic, emergency department, or hospital after(More)
OBJECTIVE The objective of this study was to determine if children who contracted pertussis infection were more likely to have parents who refused pertussis vaccinations than a similar group of children who did not develop pertussis infection. METHODS We conducted a case-control study of children enrolled in the Kaiser Permanente of Colorado health plan(More)
BACKGROUND Retinopathy of prematurity is a complication of premature birth that varies in its severity. The incidence and severity of retinopathy of prematurity at our perinatal center in a regional referral hospital changed substantially during 1995 to 1998 and presented us with an opportunity to examine whether there was a protective effect on risk of(More)