A virosome is a virus shell that contains no viral genes: it has the replication of a virus, but not the virulence. This method of manufacturing vaccines requires no viruses and does not use chicken embryos as carriers, thus preventing allergies caused by ovalbumin and reducing side effects of inoculations.
Virosome 為一種不含病毒基因的空殼病毒，只有病毒的複製功能，卻沒有病毒的致病性；採用這種疫苗製造法，不需用到病毒株，也不以雞胚胎當作載體，可以避免卵蛋白引發的過敏，減低施打後的副作用。