Research Paper On Vaccines

Research Paper On Vaccines-81
From the Danish Civil Registration System, we obtained parental links to identify siblings (defined as common father and mother) for each cohort child.Cases of autism among siblings were identified similarly to the main study outcome.

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The mainstays of the early part of the Danish program are MMR and a diphtheria, tetanus, acellular pertussis, inactivated polio, and type b (DTa P-IPV/Hib) combination.

A first dose of MMR vaccine is offered at 15 months (MMR1), with a second dose (MMR2) at 12 years of age or, since 2008, at 4 years of age.

There were no thimerosal-containing vaccines in the Danish program during the study period.

The specific MMR vaccine used in the study period contained the following vaccine strains: Schwarz (measles, 2000 to 2007) or Ender's Edmonton (measles, 2008–2013), Jeryl Lynn (mumps), and Wistar RA 27/3 (rubella).

In our cohort, MMR vaccination was not associated with autistic disorder (rate ratio, 0.92 [95% CI, 0.68 to 1.24]) or other autism spectrum disorders (rate ratio, 0.83 [CI, 0.65 to 1.07]).

In this study, we aimed to evaluate the association again in a more recent and nonoverlapping cohort of Danish children that has greater statistical power owing to more children, more cases, and longer follow-up.

Information on autism spectrum disorder diagnoses in the study period was obtained from the Danish Psychiatric Central Register (10).

Child psychiatrists diagnose and assign diagnostic codes for this register, which contains information from psychiatric hospitals and psychiatric wards (inpatients and outpatients in the study period).

It adds to previous studies through significant additional statistical power and by addressing hypotheses of susceptible subgroups and clustering of cases.

The hypothesized link between the measles, mumps, rubella (MMR) vaccine and autism continues to cause concern and challenge vaccine acceptance almost 2 decades after the controversial and later retracted paper from 1998 (1), even though observational studies have not been able to identify an increased risk for autism after MMR vaccination.


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