Keyword Analysis & Research: when was polio vaccine invented

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when was polio vaccine invented	1.1	0.5	2096	96	31
when	0.54	0.7	1899	59	4
was	0.83	0.2	6420	100	3
polio	1.48	0.3	8981	1	5
vaccine	0.59	0.5	9400	84	7
invented	0.24	0.1	2554	58	8

Keyword	CPC	PCC	Volume	Score
when was polio vaccine invented	1.08	0.7	4335	63
polio vaccine was invented by	0.51	0.9	5359	44
who invented the polio vaccine	2	0.1	9672	11
polio vaccine invented	0.46	0.9	5692	10
who invented the polio vaccine oral	1.06	0.5	3736	22
what year was the polio vaccine invented	1.51	0.7	962	85
polio vaccine was invented in what year	0.02	1	3735	45
polio vaccine was invented when	0.44	1	7573	6
jonas salk invented polio vaccine	1.46	0.6	4090	41