Originally Posted by RN4NICU
Thimerosal metabolizes in the body to ethyl mercury and thiosalicylate. It can (not always does, but CAN) cause mercury poisoning and has been linked to autism in children, particularly infants. ... Vaccines have also been linked to autoimmune disorders in adults, particularly rheumatoid arthritis.
Thimerosal-containing vaccines and autistic spectrum disorder: a critical review of published original data.
Pediatrics. 2004 Sep;114(3):793-804.
Detection of antinuclear and antilaminin antibodies in autistic children who received thimerosal-containing vaccines.
J Biomed Sci. 2004 Sep-Oct;11(5):607-10.
Autism and DPT vaccination in the United Kingdom.
N Engl J Med. 2004 Jun 24;350(26):2722-3.
A rough summary of those articles is: there is no causation between thimerosal-containing vaccine and autism.
As for the second claim about the association between RA and vaccine, the closest article I can find is:
Autoimmune diseases and vaccinations.
Eur J Dermatol. 2004 Mar-Apr;14(2):86-90. Review.
Now I have never read European Journal of Dermatology so I don't know anything about the quality of the papers (and the rigor of peer-review) of the journal. A summary of the above review article states "The available evidence derived from several negative epidemiological studies is reassuring and at least indicates that vaccines are not a major cause of autoimmune diseases." (Vial et al., Eur J Dermatol.)
A small study in Mexico to measure the effectiveness of flu shot and people w/ SLE (lupus) along with measurements to see if there is a corresponding increase in autoimmune antibodies.
Influenza vaccination of patients with systemic lupus erythematosus.
Rev Invest Clin. 2004 Jan-Feb;56(1):16-20
The result - antibody against the 3 strains of influenza increase (but overall the results were lower than healthy women). The mean disease (SLE) and anti-ds DNA antibody decrease. Now the study has several flaws. First, small sample size (n=18). Second, it's not a double-blinded test. Third - no control group.