Table 6.

Top 20 keywords in terms of frequency and centrality in Herpes zoster research.

Ranking	Frequency	Keyword	Centrality	Keyword
1	1,917	herpes zoster	0.06	mortality
2	1,059	varicella zoster virus	0.06	resistance
3	731	infection	0.05	double blind
4	615	postherpetic neuralgia	0.05	neuropathic pain
5	455	epidemiology	0.05	activation
6	396	efficacy	0.05	system
7	391	risk factor	0.05	simplex virus
8	386	herpes simplex virus	0.05	mutation
9	385	virus	0.04	reactivation
10	383	disease	0.04	varicella vaccine
11	368	risk	0.04	receptor
12	363	united states	0.04	age
13	358	children	0.04	angiotensin ii
14	337	expression	0.04	subthalamic nucleus
15	307	management	0.04	rat
16	286	diagnosis	0.04	inhibition
17	280	vaccine	0.04	viral infection
18	273	varicella-zoster virus	0.04	brain
19	272	safety	0.04	memory
20	252	therapy	0.03	risk