1
Afluria, given by injection, is made with inactivated influenza viruses grown in chicken eggs.
2
The vaccine is grown in chicken eggs.
3
The conventional method of manufacturing a vaccine from viruses grown in chicken eggs takes at least six months.
4
Flu vaccines are hard to make because they must be grown in chicken eggs for months, and viruses mutate all the time.
5
Flu vaccines are hard to make because they must be grown in chicken eggs for months, and the viruses themselves mutate every year.