. 2014 Nov 19;10(9):2729–2732. doi: 10.4161/hv.29340

Table 2.

Comparative vaccine efficacy based on delivery mechanism

Study: Intramuscular vs Intradermal^11,12
Vaccine	Intradermal	Intramuscular
Seroconversion rate	78%	66%
Seroconversion rate	85%	79%
Study: Intramuscular vs Intranasal⁸
Vaccine	Intranasal	Intramuscular
Protective efficacy	85%	71%
Relative efficacy to intramuscular	27% (more effective)	—