Thiomersal is ethyl mercury, methyl mercury is found in fish. They are very similar compounds that basically differ by 1 carbon atom. The cdc used the limits for methyl mercury an applied it to vaccines, because no safety standard for ethyl mercury exists because it has never been directly tested on humans, unless you want to count the eli lilly study from like 1929 where they gave a 1% iv solution to meningitis patients all of which died within 24 hours. In the study they claimed they died of meningitis and not the merthiolate (that was it's name back then), so they claimed it had a low order of toxicity in humans, which is completely absurd. In any case the standards for the mercury in fish are based upon oral exposure. A good portion will just pass straight through the gut where if you inject it absorption is 100%.

You know the cdc admits mercury in vaccines causes neurological conditions, such as tics. Their own research proved this. We know also tics are 4 times as prevalent in children with autism, again their own research.