This may have been due to the lower efficacy seen in the low-dose group.

Previously used meningitis vaccines had low efficacy and cost USD $80 per dose.

It is unstable and therefore must be prepared shortly before use, which has possibly led to the lower efficacy shown in some clinical trials.

Countries pay too much for drugs of low efficacy, and drugs and supplies are stolen or go to waste in government warehouses and hospitals.

The lower output in visible light is due to a lower efficacy as the star has a lower surface temperature than the Sun.

Abstinence alone has a very low efficacy in rehabilitating patients.

However, the town's supply was not only insufficient but also of presumably low efficacy, having recently expired.

We believe that in the trials the vaccine showed the lowest efficacy versus three other vaccines.

A one-time 2g dose is no longer recommended by the CDC because of low efficacy.

However, problems were encountered due to low efficacy, reactogenicity and low immunogenicity.