Maintain infectivity and provide improved virus stability during one or more freeze / thaw cycles and / or during prolonged storage in liquid form at temperatures ranging from just above freezing temperature to ambient temperature, Live virus composition.1回又は複数回の凍結/融解サイクル中及び/又は凍結温度のすぐ上~周辺温度の範囲の温度で液状での長期貯蔵中に、感染力を維持し、かつウイルス安定性の改善をもたらす、生ウイルス組成物。