"Bacteria used in dairy products" . "Vaccination" . "Gram-positive bacteria" . "Immunology" . "Probiotics" . "Bacteria described in 1923" . "Poultry diseases" . "Cytokines" . "Biotechnology" . "Digestive system" . "Viral respiratory tract infections" . "Gammacoronaviruses" . "Animal virology" . "Interleukins" . "Lactobacillaceae" .