How many Zombies are there in "Black Tide Rising"?

Doctor Curry's report to the Bank of the Americas executive meeting ("Under a Graveyard Sky"):

• 5% mortality rate from flu stage

• 20% mortality from the neurological stage

As for the rest - impossible to say, as the survivability ratio will be a function of time and conditions. In other words: the later after the plague start, there will be more dead and less survivors, as well as access to "drinking" water means zombies surviving in large numbers.

Then there's cannibalism - like the

So this is extremely hard to say how many zombies we have. I would say impossible and I think the books never say even the estimation of alive zombies, let alone some proportion. I think it's a moot question - you can't save them, only way is to eliminate them. Even the estimates for required manpower and ammunition for clearance are calculated based on deck/land area cleared to date, not numbers killed.

Also, it's worth noticing that there is a difference between "not infected" and "uninfected" survivors. Former are ones who avoided the plague whole, latter are the ones not contracting neurological sickness (after being exposed to plague). And while normally the former would be insignificant number, in the "Zombie Apocalypse" their number is statistically very significant.

It estimates 10% total survival rate of humanity and 1% uninfection rate, which implies 9% of the world population persist as zeds.