Table 2 Ochiai coefficients similarity matrix of high frequency keywords (before / during / after influenza pandemic) about pandemic Influenza Intervention

Plan

1

Policy

0.23/0.44/0.33

1

Communication

0.53/0.71/0.58

0.29/0.61/0.52

1

Surveillance

0.51/0.67/0.52

0.36/0.60/0.53

0.62/0.75/0.71

1

Risk assessment

0.13/0.13/0.32

0.22/0.31/0.44

0.24/0.19/0.34

0.26/0.20/0.34

1

Investigation

0.26/0.17/0.21

0.33/0.39/0.54

0.42/0.24/0.32

0.49/0.26/0.37

0.51/0.71/0.27

1

Education

0.19/0.31/0.24

0.32/0.51/0.54

0.36/0.43/0.34

0.38/0.42/0.40

0.49/0.44/0.29

0.43/0.56/0.72

1

Hygiene

0.14/0.26/0.21

0.23/0.32/0.40

0.25/0.36/0.31

0.26/0.37/0.27

0.67/0.47/0.22

0.36/0.67/0.42

0.57/0.67/0.57

1

Quarantine

0.22/0.14/0.16

0.45/0.32/0.38

0.32/0.20/0.26

0.33/0.19/0.28

0.27/0.76/0.25

0.28/0.53/0.62

0.48/0.38/0.67

0.34/0.40/0.41

1

Vaccine/vaccination

0.29/0.67/0.37

0.43/0.49/0.40

0.21/0.77/0.47

0.37/0.58/0.50

0.13/0.17/0.50

0.25/0.21/0.29

0.15/0.37/0.35

0.13/0.31/0.25

0.25/0.16/0.27

1

Antiviral

0.31/0.35/0.31

0.43/0.30/0.43

0.31/0.49/0.47

0.52/0.46/0.51

0.22/0.39/0.40

0.39/0.34/0.39

0.28/0.46/0.33

0.20/0.60/0.30

0.47/0.37/0.28

0.55/0.43/0.54

1

Essential service

0.24/0.26/0.18

0.25/0.43/0.46

0.30/0.28/0.31

0.44/0.22/0.33

0.33/0.51/0.43

0.45/0.53/0.64

0.46/0.45/0.58

0.32/0.51/0.39

0.40/0.54/0.49

0.22/0.18/0.32

0.38/0.38/0.41