Keyword Analysis & Research: when was smallpox vaccine invented

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when was smallpox vaccine invented	1.36	0.7	5289	33	34
when	0.48	0.9	7547	24	4
was	1.88	0.6	2560	16	3
smallpox	1.05	0.9	7824	26	8
vaccine	1.83	0.5	3626	55	7
invented	0.2	0.2	2748	33	8

Keyword	CPC	PCC	Volume	Score
when was smallpox vaccine invented	1.05	0.3	7812	98