Below is the ongoing correspondence between Tetyana Obukhanych, PhD and the WA State Department of Health regarding the safety of consuming baker’s yeast-containing products after the receipt of vaccines made using yeast-recombinant technology.


On February 10, 2020, Dr. Obukhanych submitted a petition.

Dr. Tetyana Obukhanych submitted a petition to the Washington State Board of Health, requesting they adopt guidelines for alerting vaccine administrators and recipients to monitor any potential gut-related health issues (such as gastro-intestinal food allergies, GIFAs) from consumption of baker’s/brewer’s yeast-containing foods in those vaccinated with yeast-recombinant vaccines.  She specifically requested the following:

The full petition can be read here:  WA SBOH petition – Dr Obukhanych


On April 7, 2020 the Department of Health denied the petition.


Their full response can be read here: Response – Bakers Yeast Petition


On April 22, 2020 Dr. Obukhanych requested that the Department support the dismissal of her concerns with actual scientific evidence.

She specifically requested the following:

“please provide all studies you believe ACIP has relied upon to determine that none of the pathological manifestations of non-IgE-mediated gastrointestinal food allergy (such as chronic diarrhea/constipation, delayed gastric emptying, gastroesophageal reflux/projectile vomiting, irritable bowel and gut pain) are related to the use of  yeast-recombinant vaccines.”   

Her full response can be read here:  Response-to-DOH


Dr. Obukhanych will keep ICWA informed of any further response from the WA Department of Health.  She has also written a scientifically-referenced educational article “Gastrointestinal food allergy to baker’s yeast after receiving yeast-recombinant Hepatitis B vaccine” on her website



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