Finally found expert reference to the fact that vaccines cause food allergies!

http://pediatrics.aappublications.org/cgi/content/full/113/1/170

PEDIATRICS Vol. 113 No. 1 January 2004, pp. 170-171

Gelatin Allergy

Tetsuo Nakayama, MD
Takuji Kumagai, MD
Laboratory of Viral Infection Control Kitasato Institutes for Life Sciences Tokyo 108-8641, Japan
Pediatric Allergy and Infectious Diseases Society of Sapporo Sapporo 004-0013, Japan

We feel relieved after reading the paper by Pool et al and the VAERS Team¹ on the prevalence of gelatin allergy in the United States. They conducted a retrospective analysis after measles-mumps-rubella (MMR) vaccination. Among 26 cases of anaphylaxis, only 6 (27%) were positive for anti-gelatin IgE antibodies. The rate of anaphylactic reactions reported to the VAERS is 1.8 per 1 million doses, and no substantial increase in number of reported allergic events after MMR was observed since the introduction of gelatin-containing diptheria-tetanus-acellular pertussis vaccine (DTaP) in 1997. We reported that the cases of anaphylaxis or urticaria showed high positive rates of anti-gelatin IgE antibodies, and we speculated the causal relationship of the sensitization by gelatin-containing DTaP.² Discontinuation of gelatin-containing DTaP reduced the incidence of anaphylaxis after 1999,³ and we have no report of anaphylaxis after vaccination with live virus vaccines containing hydrolyzed porcine gelatin in the last few years. Thus, we were solicitous for the incidence of anaphylaxis in the United States, but they reported that the incidence of gelatin allergy was lower than that observed in Japan.

But we suppose the different prevalence of anti-gelatin IgE depends on sensitivity for the detection of IgE antibodies against gelatin and especially on the nature of antigen for the assay. The same was the reason why the sensitization against gelatin increased in Japan. Some vaccine manufactures used poorly hydrolyzed bovine gelatin in DTaP, and some used hydrolyzed porcine gelatin. A large number of patients with anaphylaxis had a history of having DTaP containing poorly hydrolyzed bovine gelatin. Poorly hydrolyzed bovine gelatin was immunogenic when administered with alum adjuvant. They did not mention the nature of gelatin in DTaP in the United States in their paper, and we suppose that it was probably highly hydrolyzed porcine gelatin (2–3 kDa). Although it is considered as less immunogenic, gelatin-free DTaP is desirable to avoid the possibility of unnecessary sensitization against gelatin.

http://www.texaschildrens.org/carecenters/vaccine/Vaccines_SideEffects.aspx

What causes vaccine allergies?
Just as drugs and certain foods can cause allergies, any individual can be allergic to a particular vaccine. In most cases, the allergy is caused not by the killed or inactivated virus or bacterium but by some other vaccine component that is needed to stabilize or preserve the vaccine. Allergic reactions vary in severity. In their mildest form they may consist of itching and a skin rash or hives. Anaphylaxis or severe hypersensitivity reaction causing swelling of the throat and low blood pressure are thankfully extremely rare and are treated by the administration of epinephrine and other anti-allergy medication.

Hypersensitivity Reactions to Vaccine Components

The more typical route of sensitization, however, is via the absorption of aluminum through hyposensitization injections and vaccines.[5] Hyposensitization injections are used as treatment for IgE-mediated allergies, and the most commonly used extracts in these solutions are aluminum-contacting antigens. Additionally, aluminum compounds have been widely used as adjuvants in prophylactic and therapeutic vaccines to potentiate the immune response. Aluminum-containing vaccines are prepared by the adsorption of antigens onto aluminum hydroxide or aluminum phosphate gels or by the precipitation of antigens in a solution of potassium aluminum sulfate.[6]

...Cox and colleagues reported on an 18-month-old female child with dermatitis, characterized by acute weeping vesiculation at the vaccination site, that developed 6 months after she received diphtheria and tetanus toxoids and pertussis (DTP) triple vaccine.[13] A patch-test result for aluminum was positive despite no known exposures to aluminum-containing products.
Dermatitis. 2005;16(3):115-120. ©2005 American Contact Dermatitis Society

http://www.medscape.com/viewarticle/516045_2

Jones-Mote Hypersensitivity: Protein-Adjuvant Reactions
            Closely related to the tuberculin reaction, is the host response to pure protein mixed with an adjuvant. This form of DTH was discovered in 1929 by Louis Dienes. He demonstrated that when ovalbumin, an egg white protein that is normally not immunogenic, is injected into a tuberculosis tubercule, the patient would become sensitized to the protein.[10] Later with the introduction of Freund's adjuvant, the reaction could be mimicked by mixing the protein with killed mycobacterium in oil.[11] When it was discovered that any pure protein mixed with adjuvant could induce an immune response, the DTH reaction was termed the Jones-Mote reaction since it was fundamentally different from the tuberculin reaction in one remarkable aspect.[12,13] ...

http://dermatology.cdlib.org/DOJvol5num1/reviews/black.html