To provide an immunopotentiator effective in preventing infection and disease of livestock, poultry, seafood and the like.SOLUTION: The present invention provides an immunopotentiator that contains a Paracoccus bacterial cell containing carotenoid or a processed product thereof, as an active ingredient, wherein the processed product contains a cell membrane component and carotenoid.SELECTED DRAWING: None【課題】家畜、家禽、魚介類等の感染症や疾患の予防に有効な免疫増強剤を提供することを目的とする。【解決手段】カロテノイドを含有するパラコッカス菌体又はその処理物を有効成分として含む免疫増強剤であって、前記処理物は細胞膜成分とカロテノイドとを含む、前記免疫増強剤。【選択図】なし
