Under the conditions of this study, systemically or topically applied thimerosal was found to have no teratogenic effect even when given in concentrations approaching the 50% lethal dose of these compounds. A comparison of topical and subcutaneous administration of thimerosal to rabbits shows that a substantial concentration of mercury was present in blood and tissues of the treated animals and their offspring. Thimerosal was found to cross the blood-brain and placenta barriers.
Gasset AR, Itoi M, Ishii Y, Ramer RM. Teratogenicities of Ophthalmic DrugsII. Teratogenicities and Tissue Accumulation of Thimerosal. Arch Ophthalmol. 1975;93(1):52-55. doi:10.1001/archopht.1975.01010020056010