"vacuna de refuerzo" in English

booster shot- booster

cowpox- vaccine

bovine

to vaccinate

name of the letter D

from- of- as- out of- in- off- on- than- to- by

than

de-

reinforcement- strengthening- backup- booster- stiffener- backing- gusset- patch- underlay- support- intensification- intensity- French-bread sandwich- bar tack- bar-tack- bartack

to beef up- to reenforce- to back- to fortify- to whip- to intensify- to reinforce- to strengthen- to bolster- to step up- to ramp up- to shore up- to bartack- to increase

to allot- to hand over- to accord- to accord- to advance- to allow- to assign- to award- to bear- to blow- to bring forth- to deal- to dish out- to dispense- to dispense- to dole out- to earn- to get in- to give out- to give out- to hand out- to hold- to hold out- to impart- to issue- to lay on- to pass on- to pitch- to play- to produce- to produce- to proffer- to put on- to quote- to render- to send forth- to show- to sing out- to stage- to strike- to strike- to throw- to throw out- to throw up- to toss- to utter- to yield- to deal- to perform- to pitch- to strike- to quote- to return- to give- to provide- to deliver- to administer- to ruin- to spoil- to face- to flow into- to go into- to lead to- to give on to- to hit