1 Vaccines are available but are costly and only offer relatively short-term protection so the animals need regular booster vaccinations.
2 On the other hand, the booster was a public benefactor, no matter how ill-grounded his optimism.
3 This win has been a great morale booster.
4 This flyby mission could be flown on the reliable Proton booster and could be done quickly.
5 Although boosters of drilling there have long tried to cast the vast region in northeastern Alaska as a virtual frozen desert, the wilderness actually teems with life.
6 Hormone implants are used as growth boosters.