I think the main issue is that it’s not difficult to create a vaccine resistant variant, modifying smallpox is apparently quite easy. Also current vaccines are

I think the main issue is that it’s not difficult to create a vaccine resistant variant, modifying smallpox is apparently quite easy. Also current vaccines are only effective for around 5 years. I read about this recently, his other book about Ebola is worth a read too: https://en.wikipedia.org/wiki/The_Demon_in_the_Freezer https://en.wikipedia.org/wiki/The_Demon_in_the_Freezer