By Catherine J. Frompovich
The U.S. National Library of Medicine at NIH in January 2010 published online the “Final Report on Carcinogens Background Document for Formaldehyde.”  It’s an interesting document in many respects, especially since it details in vitro andin vivo studies in lab animals, i.e., rats, mice, and hamsters.
Experimental Animals: Formaldehyde has been tested for carcinogenicity in mice, rats, and hamsters. Studies reviewed include chronic and subchronic inhalation studies in mice, rats, and hamsters; chronic and subchronic drinking-water studies in rats, and hamsters; chronic and subchronic drinking-water studies in rats; and one chronic skin-application study in mice. No chronic studies in primates were found, but one subchronic inhalation study and one acute/subacute inhalation study in monkeys was reviewed. 
Granted, there was much detail given to inhalation of formaldehyde gas with some studies documenting the effects of adding formaldehyde to the animals drinking water. However, there were no studies performed on injecting formaldehyde into the animals, as often occurs when vaccines containing formaldehyde are injected into infants, toddlers, teens, adults, and senior citizens.
Question: Why no injection studies on formaldehyde? Since formaldehyde or Formalin are excipients used in the manufacture of the following vaccines:
Anthrax (BioThrax), DTaP (all brands), DTaP-Hep B-PPV (Pediarix), DTaP-Hib (TriHIBit), DT (all brands), Td (all brands), Hepatitis A (Havrix, Vaqta), Hepatitis A-Hepatitis B (Twinrix), Hib (ActHIB), Hib-Hepatitis B (Comvax), Influenza (Fluzone, Fluarix, FluLaval), Japanese encephalitis (JE-Vax), Polio-virus inactivated (Ipol), Tdap (Adacel, Boostrix) per the CDC’s PinkBook, Vaccine Excipient & Media Summary, pg. E-2
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