Isolation and characteristics of nutritional variant of streptococci of animal origin

agar agar-agar antigene antigens biochemistry biochimie cisteina cow milk cows crecimiento croissance cultivo in vitro culture in vitro cysteine growth immunological techniques in vitro culture lait de vache leche de vaca lungs mammite mastitis piridoxina pneumonia pneumonie poumon pulmones pyridoxine rat rata rats streptococcaceae symbionts symbiote technique immunologique vaca vache