After a trip to Bulgaria in 1976, Jeliński began to focus his research on finding ways to protect bees from deadly parasites.
In 1968, Jeliński enrolled at the Agricultural and Technical University of Olsztyn, to study veterinary medicine, broadening his prospective at the Tierärztliche Hochschule in Hannover, Germany.
In 1974, he completed his graduate studies and became a veterinarian, accepting employment from the National Veterinary Research Institute at the Department of Diseases of Useful Insects in Swarzędz, near Poznań.
While at the Bulgarian Department of Microbiology, Jeliński (along with Dr. M. Shabanov) published an article in the Polish magazine Pszczelarstwo (The Beekeeping) about this deadly parasite that affects honey bees.
As a subject matter expert, Jeliński’s research on bee diseases results were in broad use in Poland for the next couple of decades.
Foundation of Beekeeping Open-Air Museum (M. Jeliński)[1] and David Shulist (for a long time head of the Wilno Heritage Society - Canada) were instrumental in several displays in Żukowo of Kashubian embroidery works, done by the students of Madawaska Valley schools.