These are the most frequently used words in this book.
although
america
among
animals
areas
bacteria
between
birds
blood
called
came
cases
cats
cattle
cause
century
change
chickens
come
common
control
countries
day
death
died
disease
dogs
down
epidemic
even
fever
few
first
fleas
flies
food
found
get
good
health
home
human
hundred
infected
infection
influenza
ing
kind
life
little
live
lot
may
might
million
natural
need
new
nile
north
now
outbreak
pandemic
parasites
part
people
pets
pigs
places
plague
problems
public
rabies
rats
rodents
science
scientists
seems
should
sick
small
social
species
states
story
test
things
thousand
time
tion
two
use
used
virus
viruses
water
west
work
world
years