These are the most frequently used words in this book.
1918
2003
2004
2005
against
aids
among
another
asia
avian
between
bird
cases
cause
cdc
chickens
come
concern
countries
current
days
deadly
death
died
disease
doctors
doses
dr
drug
even
experts
fact
far
fear
few
first
flu
get
government
h5n1
health
human
infected
infection
influenza
ing
killed
less
likely
may
media
million
need
new
next
now
officials
outbreak
pandemic
panic
patients
people
percent
potential
poultry
protect
public
response
right
risk
sars
scientists
shot
should
sick
since
spanish
spread
states
still
strain
study
system
take
tamiflu
though
thousand
threat
time
tion
two
united
use
vaccine
virus
viruses
without
work
world
years