Tbh 28 days later is far more believable than TWD I could see Governments working on something like this most countries have a germ warfare labs with horrendous virus's in them, even thought some of the worst viruses don't have a cure so it would end the way we live in this world today if even one virus got out like the Rage virus

This series even though it started with a bang is going around in circles like Lost, if it doesn't get going I'm giving it a big miss there are more enjoyable series to watch ones that has a reasonable ending