bigram

This is a table of type bigram and their frequencies. Use it to search & browse the list to learn more about your study carrel.

bigram	frequency
influenza virus	617
influenza viruses	404
pandemic influenza	299
seasonal influenza	261
like illness	189
respiratory viruses	187
public health	182
acute respiratory	176
influenza surveillance	173
influenza vaccine	154
respiratory tract	143
hong kong	135
avian influenza	130
respiratory infections	128
surveillance system	113
years old	107
virus infection	105
united states	104
influenza infection	97
influenza vaccination	95
ili cases	94
respiratory illness	93
sore throat	89
surveillance data	85
age groups	84
influenza pandemic	81
influenza season	79
respiratory syncytial	78
ili patients	75
respiratory infection	75
respiratory virus	73
syncytial virus	69
ili surveillance	68
world health	67
swine influenza	67
sentinel surveillance	67
health organization	67
infectious diseases	65
mdck cells	65
hajj pilgrims	64
health care	64
infected cells	62
respiratory pathogens	61
human influenza	61
virus infections	61
ili surge	60
least one	59
disease control	59
respiratory symptoms	59
amino acid	59
immune response	58
age group	58
severe acute	57
ili incidence	56
risk factors	55
highly pathogenic	55
influenza vaccines	55
confirmed influenza	54
viral infections	52
cell culture	50
influenza activity	49
virus replication	49
real time	47
viruses isolated	47
influenza epidemics	46
time pcr	46
time rt	46
case definition	46
surveillance systems	45
tract infections	44
respiratory viral	43
ae log	43
viral respiratory	43
first wave	43
influenza cases	42
pathogenic avian	42
previously described	41
like incidence	41
significantly higher	41
lower respiratory	40
copyright holder	40
upper respiratory	40
granted medrxiv	40
preventive measures	40
author funder	40
viral shedding	40
influenza seasons	40
logistic regression	40
influenza ili	39
household transmission	39
sari cases	39
sentinel sites	39
syndromic surveillance	38
air pollution	38
cord uid	38
school closure	38
antibody response	38
viral load	38
doc id	38
pandemic virus	38
icu admissions	37
influenza transmission	37
detection rate	37
national influenza	37
case definitions	37
present study	36
polymerase chain	36
influenza epidemic	36
vaccine strain	35
chain reaction	35
gene segments	35
general population	35
infectious disease	35
virus isolation	35
weight loss	35
study period	34
epidemic period	34
antiviral treatment	34
new york	33
growth rate	33
fast set	33
respiratory disease	33
samples collected	33
viral infection	33
human metapneumovirus	33
young children	33
antibody titers	32
children aged	32
applied biosystems	32
influenza infections	32
days post	31
phylogenetic analysis	31
icu data	31
respiratory syndrome	31
ili data	31
epithelial cells	31
cruise ship	31
case detection	31
median age	31
early detection	31
confirmed cases	30
runny nose	30
secondary ili	30
positive rate	30
clinical symptoms	30
school breaks	29
immune responses	29
ili episodes	29
clinical rate	29
clinical signs	29
severe disease	28
southern china	28
tested positive	28
chicken eggs	28
vaccine effectiveness	28
statistically significant	28
live attenuated	28
adjuvanted vaccine	28
social distancing	28
pdm virus	28
virus strains	28
ha gene	28
version posted	27
disease surveillance	27
antiviral drugs	27
influenza outbreaks	27
performed using	27
body weight	27
intensive care	27
seasonal threshold	27
total number	27
based surveillance	27
virus transmission	26
human respiratory	26
ili case	26
made available	26
winter breaks	26
symptom onset	26
ae lg	26
pandemic vaccine	26
influenza strains	26
predictive value	26
ili definition	26
study design	25
nasal washes	25
informed consent	25
household members	25
novel coronavirus	25
nasal swabs	25
data collection	25
cleavage site	25
confidence interval	25
excess ili	25
within hours	25
crew members	25
virus detection	25
clinical samples	25
like illnesses	24
secondary cases	24
parainfluenza viruses	24
virus ns	24
severe cases	24
detection rates	24
household contacts	24
clinical characteristics	24
origin influenza	24
sari patients	24
mdck pf	24
international license	24
rsv infection	24
viral rna	24
less likely	24
cohort study	24
factors associated	24
hand hygiene	24
year old	24
multiplex pcr	23
cell index	23
embryonated chicken	23
older adults	23
positive samples	23
cytopathic effect	23
severe influenza	23
cruise ships	23
cell lines	23
na genes	22
viruses detected	22
regression model	22
based model	22
case patient	22
case counts	22
weekly ili	22
inactivated influenza	22
viruses circulating	22
per year	22
ae ae	22
clinical specimens	22
respiratory diseases	22
throat swabs	22
high yield	22
passive immunotherapy	22
southern hemisphere	22
human seasonal	21
vaccination status	21
epidemic curve	21
primary care	21
internal genes	21
systematic review	21
fatality rate	21
standard deviation	21
like viruses	21
human macrophages	21
clinical data	21
medrxiv preprint	21
reverse genetics	21
national institute	21
virus isolates	21
influenza positive	20
ari episodes	20
aged years	20
cell death	20
ae ml	20
log tcid	20
reverse transcription	20
pcr assay	20
among pilgrims	20
tract infection	20
isolation rate	20
clinical case	20
parainfluenza virus	20
one virus	20
early warning	20
moving average	20
results suggest	20
vaccine candidates	20
pdm viruses	20
bacterial infection	20
mdck cell	20
resistant viruses	20
sentinel hospitals	20
virus titers	20
nasopharyngeal swabs	20
vaccine production	20
pandemic strain	20
set infa	20
versus ae	20
infected patients	19
peer review	19
antigenic cartography	19
antigenic drift	19
vaccine strains	19
febrile respiratory	19
circulating influenza	19
infections among	19
respiratory samples	19
regression models	19
ic values	19
geometric mean	19
chicken embryos	19
saudi arabia	19
virus infected	19
novel influenza	19
severe illness	19
virus type	19
confirmed covid	19
cell cultures	19
transport medium	19
attenuated influenza	19
patients infected	18
solar radiation	18
sample collection	18
na gene	18
oseltamivir resistance	18
ae versus	18
pf cells	18
data analysis	18
sentinel ducks	18
serum samples	18
global influenza	18
ili visits	18
study population	18
school students	18
pandemic potential	18
hospital admissions	18
laboratory testing	18
nucleic acid	18
resistant virus	18
australian hajj	18
disease burden	18
may also	18
fluor tm	18
among children	18
primary case	18
time reverse	18
increased risk	18
attack rate	18
previous studies	18
significant differences	18
antibody responses	18
pandemic wave	18
tm assay	18
antiviral resistance	17
care unit	17
young adults	17
neuraminidase inhibitor	17
migratory ducks	17
swab specimens	17
na mutation	17
human bocavirus	17
ili symptoms	17
clinical trial	17
laiv candidates	17
ili sentinel	17
ffp respirators	17
rhinovirus enterovirus	17
pcr assays	17
immune system	17
among sari	17
day post	17
ae ng	17
viral loads	17
swine origin	17
regression analysis	17
nasal swab	17
infection control	17
pneumococcal vaccine	16
disease severity	16
ha cleavage	16
canine kidney	16
one week	16
neuraminidase inhibitors	16
health surveillance	16
among patients	16
relative humidity	16
infected mice	16
virus circulation	16
time series	16
reverse transcriptase	16
mean age	16
detect influenza	16
higher risk	16
two weeks	16
ns protein	16
missing data	16
clinical trials	16
clinical presentation	16
case patients	16
controlled trial	16
second vaccination	16
specific igy	16
suspected cases	16
secondary bacterial	16
icu admission	16
elderly people	16
vaccination coverage	16
reactive antibody	16
influenza vii	16
high risk	16
predicting influenza	16
results showed	16
among hajj	16
viral culture	15
statistical analysis	15
human infection	15
influenza like	15
influenza sentinel	15
bacterial infections	15
including influenza	15
national health	15
aged children	15
using data	15
hours post	15
described previously	15
incidence rates	15
inactivated vaccine	15
hemagglutination inhibition	15
average number	15
significantly lower	15
south africa	15
viral pathogens	15
rapid antigen	15
control measures	15
rights reserved	15
darby canine	15
antiviral drug	15
sequence alignment	15
summer breaks	15
sequence analysis	15
one respiratory	15
specimen collection	15
surveillance network	15
health service	15
pb gene	15
sandwich elisa	15
important role	15
small number	15
statistical analyses	15
north america	15
doubling time	15
swine flu	15
data sources	15
hajj pilgrimage	14
well plates	14
previously reported	14
reproduction number	14
positive patients	14
two doses	14
antigenic sites	14
allergenic pollen	14
room temperature	14
allowed without	14
alveolar epithelial	14
human adenovirus	14
sudden onset	14
commonly detected	14
coronavirus disease	14
inhibition assay	14
symptomatic case	14
drug resistance	14
positive predictive	14
confirmed case	14
medical research	14
poisson regression	14
without permission	14
zhejiang province	14
classical swine	14
ns gene	14
acquired pneumonia	14
circulating strains	14
viral isolation	14
xtd tm	14
military health	14
step rt	14
confidence intervals	14
acid changes	14
direct contact	14
resplex ii	14
virus positive	14
reuse allowed	14
mortality rate	14
fatal cases	14
pilot project	14
posted june	14
hospitalized patients	14
table shows	14
gene segment	14
developing countries	14
intensity thresholds	14
pandemic flu	14
allantoic fluid	14
also found	14
household incidence	13
moving epidemic	13
seeking behavior	13
amino acids	13
serial interval	13
healthcare workers	13
symptomatic cases	13
posted april	13
bacterial pneumonia	13
closely related	13
monoclonal antibodies	13
protective immunity	13
epidemic threshold	13
antiviral agents	13
blood samples	13
clinical features	13
first vaccination	13
innate immune	13
gene expression	13
vaccine groups	13
laboratory confirmed	13
peak activity	13
time period	13
human transmission	13
plaque assay	13
exponential growth	13
meteorological variables	13
ex vivo	13
healthy children	13
sensing receptors	13
viral replication	13
per week	13
viral etiology	13
laboratory results	13
medical care	13
detecting influenza	13
wild type	13
growth rates	13
community cohort	13
phylogenetic trees	13
doubling times	13
ili activity	13
among ili	13
syndrome coronavirus	13
adults hospitalized	13
total pollen	13
pneumococcal vaccination	13
viral titers	13
treated mice	13
pandemic strains	13
virus strain	13
within days	13
epidemic method	13
respiratory specimens	13
control chart	13
indoor air	13
control group	13
general practitioners	13
human coronavirus	13
pandemic scenario	13
surveillance program	13
low pathogenic	13
disease outbreaks	13
human lung	13
sample size	13
written informed	13
pandemic viruses	13
epidemiological data	13
emerging infectious	13
hpai virus	13
immunized mice	13
receptor binding	13
influenza outbreak	13
new influenza	13
rgy sub	13
novel swine	13
vaccine uptake	13
high rates	13
samples tested	13
true prevalence	13
high levels	13
full genome	13
common respiratory	12
second dose	12
household ili	12
current week	12
nasopharyngeal swab	12
among australian	12
reproductive number	12
clinical rates	12
erk activation	12
latent period	12
primary human	12
multiplex assay	12
three weeks	12
study also	12
health behavior	12
healthy controls	12
influenza neuraminidase	12
school children	12
rna extraction	12
surveillance study	12
statistical significance	12
nasal congestion	12
associated hospitalizations	12
rgvac ins	12
prior protection	12
household compound	12
community transmission	12
ae years	12
innate sensing	12
classical reassortment	12
antigenic changes	12
virus vaccine	12
data collected	12
hi antibody	12
study showed	12
care facilities	12
genetic characteristics	12
ae lm	12
significantly reduced	12
chart method	12
viral detection	12
type virus	12
health research	12
neuraminidase assay	12
ct values	12
infectious virus	12
haemophilus influenzae	12
vaccine efficacy	12
level allergenic	12
entry screening	12
vaccine administration	12
ev species	12
upper limit	12
elderly persons	12
sensitivity analysis	12
wt virus	12
higher proportion	11
health authorities	11
patients hospitalized	11
hi titres	11
recent study	11
phylogenetic analyses	11
rapid detection	11
endothelial cells	11
signaling pathways	11
ili events	11
different subtypes	11
average epidemic	11
peripheral blood	11
per person	11
ethics committee	11
poyang lake	11
infectious agents	11
detection limit	11
health system	11
illness among	11
infection among	11
ad hoc	11
first pandemic	11
oseltamivir carboxylate	11
mem method	11
ii cells	11
rgvac sub	11
laboratory confirmation	11
detection kit	11
virus gene	11
even though	11
transmission model	11
school aged	11
bronchoalveolar lavage	11
competing interests	11
neutralizing antibodies	11
cell line	11
host response	11
influenza antigenic	11
syndromic case	11
many countries	11
ah pdm	11
european countries	11
immunotherapy program	11
highly sensitive	11
study conducted	11
future studies	11
placebo group	11
north american	11
three consecutive	11
multiple sequence	11
health centers	11
genome sequences	11
analysis using	11
adult patients	11
molecular epidemiology	11
reassortant viruses	11
joining method	11
new virus	11
influenza type	11
research agenda	11
first time	11
infection fatality	11
results show	11
unexplained pneumonia	11
swine viruses	11
hajj season	11
slightly lower	11
frequently detected	11
influenza among	11
among household	11
lab data	11
old embryonated	11
care utilization	11
may lead	11
time lag	11
tissue culture	11
may provide	11
novel pandemic	11
study participants	11
binding specificity	11
significantly associated	11
testing positive	11
composite parameter	11
mice infected	11
two hospitals	11
significantly different	11
selective cox	11
south america	11
high prevalence	11
severe respiratory	11
inverse correlation	11
transcription polymerase	11
influenza incidence	11
adenovirus type	11
influenzae type	11
sunshine duration	11
randomly selected	11
compound members	10
monoclonal antibody	10
genome sequencing	10
least two	10
local case	10
review board	10
nasal discharge	10
specific siga	10
coronavirus nl	10
ae days	10
large numbers	10
human airway	10
contact ferrets	10
pilot study	10
start date	10
software version	10
vaccine candidate	10
highly significant	10
weeks ahead	10
influenzae non	10
vaccination campaign	10
research institute	10
ci ae	10
transmission rate	10
european union	10
cm protein	10
york city	10
resistant influenza	10
institutional review	10
adults aged	10
financial support	10
viruses may	10
influenza detection	10
decision making	10
malaysian pilgrims	10
influenza center	10
natural history	10
influenza rapid	10
medical conditions	10
nuclear translocation	10
human population	10
virus yield	10
pollen concentrations	10
historical data	10
high level	10
study staff	10
respiratory rate	10
molecular characterization	10
hai antibody	10
day lag	10
different countries	10
diseases among	10
alert thresholds	10
exact test	10
mus tlr	10
intranasal administration	10
well plate	10
genetic reassortment	10
respiratory illnesses	10
incidence rate	10
donor percentage	10
guinea pigs	10
based influenza	10
prospective study	10
randomised controlled	10
ari onset	10
infected individuals	10
general practice	10
military recruits	10
receptor specificity	10
older children	10
oropharyngeal swabs	10
cell proliferation	10
much higher	10
incubation period	10
previously published	10
russian federation	10
basic amino	10
virus titer	10
also shows	10
taken together	10
antigenic site	10
infected human	10
influenza activities	10
findings suggest	10
covid cases	10
seasonal epidemics	10
mrna splicing	10
sequence data	10
old female	10
first imported	10
active surveillance	10
mass vaccination	10
care facility	10
virological surveillance	10
post infection	10
risk groups	10
outpatient visits	10
minor poultry	10
viral na	10
infectious dose	10
time points	10
years age	10
across different	10
family members	10
patients seen	10
conducted using	10
emergency departments	10
disease prevention	10
east asia	10
subtype influenza	9
specific primers	9
inflammatory response	9
anomaly detection	9
lung tissue	9
antiviral coating	9
viral transport	9
viruses using	9
pcr positive	9
ns genes	9
another study	9
treatment coverage	9
key points	9
lung injury	9
serial dilutions	9
influenza thresholds	9
clinical isolates	9
iav infection	9
ili among	9
consecutive weeks	9
influenza pandemics	9
influenza viral	9
human serum	9
mass gatherings	9
respiratory failure	9
hai antibodies	9
negative predictive	9
wild birds	9
multivariate analysis	9
lg ha	9
day care	9
th week	9
school closures	9
northern hemisphere	9
seasonal trends	9
embryonated eggs	9
acute febrile	9
mouse model	9
capital city	9
immunosuppressive treatment	9
illness onset	9
respiratory distress	9
original clinical	9
health topics	9
inactivated vaccines	9
ili due	9
among adults	9
nasal wash	9
elderly population	9
significant difference	9
march th	9
virus vaccines	9
mortality rates	9
inflammatory cytokines	9
relative risk	9
see table	9
positive cases	9
total cohort	9
viral strains	9
confirmed viral	9
na inhibitors	9
specific mrna	9
three waves	9
google flu	9
across states	9
prior immunity	9
previous years	9
binding site	9
air conditioning	9
epidemiological surveillance	9
high sensitivity	9
sari surveillance	9
fri cases	9
potential conflicts	9
observational study	9
na activity	9
european centre	9
study using	9
new zealand	9
tested using	9
using real	9
risk communication	9
viruses belonging	9
reported among	9
shared latrines	9
univariate analysis	9
described elsewhere	9
antiviral efficacy	9
basic reproductive	9
different age	9
log eid	9
pandemic alert	9
like receptor	9
previous study	9
antigenic characterization	9
hemisphere influenza	9
virus production	9
absorbance values	9
winter season	9
subjects vaccinated	9
syncytial viruses	9
reference laboratory	9
trivalent influenza	9
sialic acid	9
ferrets infected	9
epidemic curves	9
nice registry	9
new protocol	9
human cases	9
greater accra	9
wide range	9
seasonal strains	9
na inhibitor	9
australian pilgrims	9
older age	9
correlation coefficient	9
temporal model	9
among malaysian	9
viruses among	9
simulation model	9
time cell	9
th century	9
specific cd	9
commonly used	9
information criterion	9
us centers	9
two groups	9
medical staff	9
nucleotide sequences	9
second week	9
priority public	9
pharmaceutical interventions	9
research topics	9
common among	9
circulating viruses	9
confirmed ph	9
state i	9
underlying conditions	9
middle east	9
studies conducted	9
control study	9
rainy season	9
one dose	9
triple reassortant	9
ilinet data	9
developed countries	9
prospective cohort	9
first local	9
rate among	9
different settings	9
matrix gene	9
vaccine development	8
illness associated	8
influenza subtype	8
panel viruses	8
pharmaceutical substances	8
patients admitted	8
pdm influenza	8
similar results	8
accra region	8
recombinant strain	8
data regarding	8
virus subtype	8
like symptoms	8
pulmonary disease	8
analyzed using	8
chronic respiratory	8
winter summer	8
seasonal human	8
cytoplasmic tail	8
seeking behaviour	8
aerosol transmission	8
additional information	8
female balb	8
ili values	8
respir viruses	8
guinea pig	8
cross protection	8
also reported	8
virus isolated	8
oseltamivir treatment	8
earlier studies	8
nursing home	8
positivity rate	8
coated respirators	8
virus types	8
ili definitions	8
na mutations	8
antiviral therapy	8
adjuvanted clade	8
primary health	8
type ii	8
reported previously	8
ae nm	8
among influenza	8
immunocompromised patients	8
stool samples	8
new rat	8
hi titers	8
also detected	8
strains isolated	8
military personnel	8
chronic illnesses	8
test results	8
several limitations	8
warning system	8
children hospitalized	8
bacterial species	8
accession numbers	8
antiviral activity	8
multiplex real	8
assay kit	8
migratory birds	8
laboratory data	8
also used	8
specific antibodies	8
risk factor	8
national surveillance	8
mucosal immunity	8
prevalence estimates	8
monitoring system	8
asian countries	8
acute lung	8
meteorological parameters	8
herd immunity	8
acute onset	8
human subjects	8
monitoring influenza	8
vaccinated animals	8
probe set	8
methods used	8
acute ili	8
widely used	8
patients presenting	8
hospitalized children	8
level risk	8
supplementary table	8
age distribution	8
data obtained	8
ili episode	8
median week	8
average viral	8
allowed us	8
respiratory symptom	8
pcr detection	8
like lineage	8
vaccination rate	8
search query	8
case report	8
master mix	8
flow cytometry	8
avian flu	8
annual influenza	8
virus lineages	8
type i	8
virus shedding	8
flu trends	8
plos one	8
descriptive statistics	8
ha titres	8
normalized absorbance	8
naturally acquired	8
communicable diseases	8
bacterial pathogens	8
health emergencies	8
cdc protocol	8
vaccination program	8
simple method	8
limited number	8
viral mrna	8
aluminum hydroxide	8
advisory committee	8
antiviral intervention	8
blood service	8
multiplex rt	8
east respiratory	8
acid substitutions	8
seasonal variation	8
investigation forms	8
specimens collected	8
throat swab	8
outpatient consultations	8
pandemic preparedness	8
children years	8
determine whether	8
derived reassortants	8
cellular immune	8
specific ili	8
mean ic	8
viral antigen	8
standard deviations	8
atypical bacteria	8
old age	8
epidemic weeks	8
viral isolates	8
influenza testing	8
low level	8
airway epithelium	8
cases among	8
seasonal flu	8
uninfected cells	8
hygiene measures	8
final version	8
parameter estimates	8
red blood	8
preventative measures	8
st century	8
virus titration	8
binding preference	8
surveillance networks	8
nasopharyngeal aspirates	8
attack rates	8
different influenza	8
assay using	8
ae among	8
low rank	8
genetic analysis	8
reduced susceptibility	8
genome types	8
eurasian avian	8
patients among	8
singapore military	8
partial protection	8
viruses associated	8
long term	8
ae mg	8
reported ili	8
routine surveillance	8
influenza reference	8
heart disease	8
low reactors	8
influenza disease	8
final model	8
epidemic influenza	8
side effects	8
two methods	8
pandemic period	8
influenza antigen	8
diagnostic tests	8
blown specimens	8
inoculated intranasally	8
vaccination hi	8
blood donors	8
patients without	8
several studies	7
various organs	7
ili rate	7
two days	7
calculated using	7
six internal	7
available data	7
haemagglutination inhibition	7
threshold values	7
negative samples	7
drug susceptibility	7
per cent	7
version ae	7
case fatality	7
will also	7
linear regression	7
virus containing	7
clinical information	7
performed according	7
influenza respiratory	7
using icu	7
foster city	7
alert threshold	7
viruses tested	7
antibody titer	7
total rna	7
poisson model	7
influenza patients	7
global pandemic	7
york state	7
virologic data	7
economic burden	7
incubation time	7
surveillance sites	7
quality control	7
results obtained	7
antigen tests	7
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eastern china	7
coated respirator	7
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military training	7
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observed among	7
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fluvac study	7
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clinical study	7
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health officials	7
staphylococcus aureus	7
enterovirus genotypes	7
par agonists	7
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study subjects	7
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uri cases	7
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ic kit	7
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serfling method	7
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ph ae	7
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generated using	7
immunomodulatory agents	7
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south african	7
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new jersey	7
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igv domain	7
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per day	7
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tm influenza	7
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ct value	7
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mycoplasma pneumoniae	7
apoptotic response	7
french pilgrims	7
cartography construction	7
dry cough	7
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virus ha	7
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ili samples	7
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osv cam	7
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rna segment	7
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health systems	7
hypogammaglobulinemic patients	7
i i	7
significant increases	7
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june th	7
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pcr system	7
hypogammaglobulinemia patients	7
seasonal epidemic	7
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west africa	7
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military populations	7
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schoolchildren aged	7
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ic determination	6
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blackwell publishing	6
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female sex	6
development core	6
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time polymerase	6
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phase i	6
ili outpatients	6
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three times	6
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two major	6
matrix protein	6
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later waves	6
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query data	6
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care units	6
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ae sd	6
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income countries	6
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ci upper	6
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ill individuals	6
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ae tcid	5
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ili reported	5
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sectional study	4
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temperature cut	4
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four viruses	4
oceanian avian	4
counts across	4
contact pigs	4
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medical center	4
initial epidemic	4
virus infectivity	4
rt pcr	4
birth weight	4
infection symptoms	4
day doubling	4
early diagnosis	4
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culture derived	4
sas version	4
based tours	4
antiviral potential	4
search index	4
fairly similar	4
vaccine viruses	4
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vaccinated participants	4
whole genome	4
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replication kinetics	4
viral interference	4
optimised design	4
infection may	4
showed similar	4
world data	4
seek medical	4
one child	4
like ha	4
working group	4
severity estimates	4
detection system	4
ainfected cells	4
chemiluminescent neuraminidase	4
vero cells	4
species hadv	4
mrna expression	4
study demonstrates	4
expected prevalence	4
multivariate models	4
coryzal symptoms	4
pandemic situation	4
donor ferrets	4
sampling methods	4
secular trend	4
health behaviors	4
young adult	4
acquired protection	4
among small	4
age cohort	4
disease association	4
wide passive	4
pandemic diseases	4
seasonal baseline	4
two seasons	4
patients older	4
seasonal viruses	4
two ferrets	4
significant number	4
lower transmissibility	4
viruses identified	4
previously infected	4
underlying risk	4
virus culture	4
open access	4
three patients	4
uncoated respirators	4
ffp respirator	4
rate ratio	4
antibiotic resistance	4
possible explanation	4
resistant isolates	4
following challenge	4
constitutional symptoms	4
rhinovirus outbreak	4
whole virus	4
strain pr	4
endemic swine	4